Using mass (M), length (L), time (T) and current [A] as fundamental quantities, the dimensional formula of permittivity is
A)
\[[M{{L}^{-2}}{{T}^{2}}A]\]
done
clear
B)
\[[{{M}^{-1}}{{L}^{-3}}{{T}^{4}}{{A}^{2}}]\]
done
clear
C)
\[[ML{{T}^{-2}}A]\]
done
clear
D)
\[[M{{L}^{2}}{{T}^{-1}}{{A}^{2}}]\]
done
clear
View Answer play_arrow
A Ge specimen is doped with Al. The concentration of acceptor atoms is\[\sim 1{{0}^{21}}atoms/{{m}^{3}}\]. Given that the intrinsic concentration of electron-hole pairs is \[\sim 1{{0}^{19}}\,/{{m}^{3}}\], the concentration of electrons in the specimen is
A)
\[1{{0}^{17}}\,/{{m}^{3}}\]
done
clear
B)
\[1{{0}^{15}}\,/{{m}^{3}}\]
done
clear
C)
\[1{{0}^{4}}\,/{{m}^{3}}\]
done
clear
D)
\[1{{0}^{2}}\,/{{m}^{3}}\]
done
clear
View Answer play_arrow
The cyclotron frequency of an electron gyrating in a magnetic field of 1 T is approximately
A)
28 MHz
done
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B)
280 MHz
done
clear
C)
2.8 GHz
done
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D)
28 GHz
done
clear
View Answer play_arrow
In the basic CsCl crystal structure, \[C{{s}^{+}}\] and \[C{{l}^{-}}\] ions are arranged in a bcc configuration as shown in the figure. The net electrostatic force exerted by the eight \[C{{s}^{+}}\] ions on the \[C{{l}^{-}}\] ion is
A)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\,\,\frac{4{{e}^{2}}}{3{{a}^{2}}}\]
done
clear
B)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\,\,\frac{16{{e}^{2}}}{3{{a}^{2}}}\]
done
clear
C)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\,\,\frac{32{{e}^{2}}}{3{{a}^{2}}}\]
done
clear
D)
zero
done
clear
View Answer play_arrow
N moles of a monoatomic gas is carried round the reversible rectangular cycle ABCDA as shown in the diagram. The temperature at A is\[{{T}_{0}}\]. The thermodynamic efficiency of the cycle is
A)
\[15\,%\]
done
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B)
\[50\,%\]
done
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C)
\[20\,%\]
done
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D)
\[20\,%\]
done
clear
View Answer play_arrow
An organ pipe closed at one end has fundamental frequency of 1500 Hz. The maximum number of overtones generated by this pipe which a normal person can hear is
A)
4
done
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B)
13
done
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C)
6
done
clear
D)
9
done
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View Answer play_arrow
A monochromatic beam of light is used for the formation of fringes on the screen by illuminating the two slits in the Young's double slit interference experiment. When a thin film of mica is interposed in the path of one of the interfering beams, then
A)
the fringe width increases
done
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B)
the fringe width decreases
done
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C)
the fringe width remains the same but the pattern shifts
done
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D)
the fringe pattern disappears
done
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View Answer play_arrow
A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80 m/s. The total energy imparted to the two fragments is
A)
1.07 kJ
done
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B)
2.14 Kj
done
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C)
2.4 kJ
done
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D)
4.8 kJ
done
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View Answer play_arrow
Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increase by a factor of
A)
\[{{10}^{4}}\]
done
clear
B)
625
done
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C)
256
done
clear
D)
16
done
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View Answer play_arrow
The temperature (7) dependence of resistivity \[(\rho )\] of a semiconductor is represented by:
A)
done
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B)
done
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C)
done
clear
D)
done
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View Answer play_arrow
A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that \[\operatorname{r} >> R\], varies as
A)
\[1/r\]
done
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B)
\[1/{{r}^{3}}{{^{/}}^{2}}\]
done
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C)
\[1/{{r}^{2}}\]
done
clear
D)
\[1/{{r}^{3}}\]
done
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View Answer play_arrow
The magnetic field due to a straight conductor of uniform cross-section of radius a and carrying a steady current is represented by
A)
done
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B)
done
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C)
done
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D)
done
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View Answer play_arrow
Which of the following velocity-time graphs shows a realistic situation for a body in motion?
A)
done
clear
B)
done
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C)
done
clear
D)
done
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View Answer play_arrow
Equipotential surfaces associated with an electric field which is increasing in magnitude along the direction are
A)
planes parallel to yz-plane
done
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B)
planes parallel to xy-plane
done
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C)
planes parallel to xz-plane
done
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D)
coaxial cylinders of increasing radii around the x-axis
done
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View Answer play_arrow
A proton and an\[\alpha -particle\], moving with the same velocity enter a uniform of their motion. The ratio of the radii of the circular paths described by the proton and a-particle is:
A)
\[1:2\]
done
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B)
\[1 : 4\]
done
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C)
\[1 : 16\]
done
clear
D)
\[4\,\,:\,\,1\]
done
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View Answer play_arrow
A nucleus of mass number A, originally at rest, emits an \[\alpha -particle\] with speed v. The daughter nucleus recoils with a speed
A)
\[\frac{2\,\nu }{A+4}\]
done
clear
B)
\[\frac{4\,\nu }{A+4}\]
done
clear
C)
\[\frac{4\,\nu }{A-4}\]
done
clear
D)
\[\frac{2\,\nu }{A-4}\]
done
clear
View Answer play_arrow
When an electron-positron pair annihilates, the energy released is about
A)
\[0.8 \times \,\,{{10}^{-}}^{13}\,J\]
done
clear
B)
\[1.6 \times \,\,{{10}^{-}}^{13}\,J\]
done
clear
C)
\[3.2 \,\times \,\,{{10}^{-}}^{13}\,J\]
done
clear
D)
\[4.8 \,\times \,\,{{10}^{-}}^{13}\,J\]
done
clear
View Answer play_arrow
A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. The minimum reverse potential to be applied for stopping the emission of electrons is
A)
2 V
done
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B)
4 V
done
clear
C)
6 V
done
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D)
8 V
done
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View Answer play_arrow
We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolve a width of say 10 pm. If an electron microscope is used, the minimum electron energy required is about
A)
1.5 keV
done
clear
B)
15 keV
done
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C)
150 keV
done
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D)
1.5 MeV
done
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View Answer play_arrow
Which logic gate is represented by the following combination of logic gates?
A)
OR
done
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B)
NAND
done
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C)
AND
done
clear
D)
NOR
done
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View Answer play_arrow
A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to\[-K/{{r}^{2}}\], where K is a constant. The total energy of the particle is
A)
\[\frac{K}{2r}\]
done
clear
B)
\[-\frac{K}{2r}\]
done
clear
C)
\[-\frac{K}{r}\]
done
clear
D)
\[\frac{K}{r}\]
done
clear
View Answer play_arrow
A ray of light is incident at \[50{}^\circ \] on the middle, of one of the two mirrors arranged at an angle of \[60{}^\circ \] between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
A)
\[50{}^\circ \]
done
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B)
\[60{}^\circ \]
done
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C)
\[70{}^\circ \]
done
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D)
\[80{}^\circ \]
done
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View Answer play_arrow
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at
A)
Infinity
done
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B)
Focus
done
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C)
Pole
done
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D)
15 cm behind the mirror
done
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View Answer play_arrow
The graph shows the variation of temperature (T) of one kilogram of a material with the heat (H) supplied to it. At O, the substance is in the solid state. From the graph, we can conclude that
A)
\[{{T}_{2}}\] is the melting point of the solid
done
clear
B)
BC represents the change of state from solid to liquid
done
clear
C)
\[\left( {{H}_{2}}-{{H}_{1}} \right)\] represents the latent heat of fusion of the substance
done
clear
D)
\[\left( {{H}_{3}}-{{H}_{1}} \right)\] represents the latent heat of vaporization of the liquid
done
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View Answer play_arrow
A disc and a ring of same mass are rolling and if their kinetic energies are equal, then the ratio of their velocities will be
A)
\[\sqrt{4}\,\,:\,\,\sqrt{3}\]
done
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B)
\[\sqrt{3}\,\,:\,\,\sqrt{4}\]
done
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C)
\[\sqrt{3}\,\,:\,\,\sqrt{2}\]
done
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D)
\[\sqrt{2}\,\,:\,\,\sqrt{3}\]
done
clear
View Answer play_arrow
Select the pair whose dimensions are the same
A)
Pressure and stress
done
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B)
Stress and strain
done
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C)
Pressure and force
done
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D)
Power and force
done
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View Answer play_arrow
A body is moving from rest under constant acceleration and let \[{{S}_{1}}\] be the displacement in the first \[(p-1)\] sec and \[{{S}_{2}}\] be the displacement in the first p sec. The displacement in \[\left( {{p}^{2}}-p +1 \right)th\] sec will be
A)
\[{{\operatorname{S}}_{1}}+{{S}_{2}}\]
done
clear
B)
\[{{\operatorname{S}}_{1}}{{S}_{2}}\]
done
clear
C)
\[{{\operatorname{S}}_{1}}-{{S}_{2}}\]
done
clear
D)
\[{{\operatorname{S}}_{1}}/{{S}_{2}}\]
done
clear
View Answer play_arrow
If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force \[\left( -k/{{r}^{2}} \right)\]the total energy is
A)
\[-\frac{k}{2r}\]
done
clear
B)
\[-\frac{k}{r}\]
done
clear
C)
\[-\frac{2\,k}{r}\]
done
clear
D)
\[-\frac{4\,k}{r}\]
done
clear
View Answer play_arrow
A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is
A)
550 N
done
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B)
50 N
done
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C)
250 N
done
clear
D)
250 dyne
done
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View Answer play_arrow
A projectile fired with initial velocity u at some jl angle \[\theta \] has a range R. If the initial velocity be j doubled at the same angle of projection, then the range will be
A)
2R
done
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B)
R/2
done
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C)
R
done
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D)
4R
done
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View Answer play_arrow
When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if \[\operatorname{g}= 10 m/{{s}^{2}}\]
A)
1.5 Joule
done
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B)
2.0 Joule
done
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C)
2.5 Joule
done
clear
D)
3.0 Joule
done
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View Answer play_arrow
A body weighs 700 gm wt on the surface of the earth. How much will it weigh on the surface of a planet whose mass is 1/7 and radius is half that of the earth?
A)
200 gm wt
done
clear
B)
400gmwt
done
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C)
50 gm wt
done
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D)
300 gm wt
done
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View Answer play_arrow
Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will be
A)
2 mm
done
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B)
0.5 mm
done
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C)
4 mm
done
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D)
0.25 mm
done
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View Answer play_arrow
Energy needed in breaking a drop of radius R into n drops of radii r is given by
A)
\[4\pi T\left( n{{r}^{2}}-{{R}^{2}} \right)\]
done
clear
B)
\[\frac{4}{3}\pi \left( {{r}^{3}}n-{{R}^{2}} \right)\]
done
clear
C)
\[4\pi T\left( {{R}^{2}}-{{n}^{2}} \right)\]
done
clear
D)
\[4\pi T\left( n{{r}^{2}}+{{R}^{2}} \right)\]
done
clear
View Answer play_arrow
The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 J of the density of mercury, the depth of the lake is
A)
5 m
done
clear
B)
10 m
done
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C)
15 m
done
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D)
20 m
done
clear
View Answer play_arrow
A pendulum clock keeps correct time at\[0{}^\circ C\]. Its mean coefficient of linear expansions is \[\alpha /{}^\circ C\], then the loss in seconds per day by the clock if the temperature rises by \[t{}^\circ C\] is
A)
\[\frac{\frac{1}{2}\alpha t\times 864000}{1-\frac{\alpha t}{2}}\]
done
clear
B)
\[\frac{1}{2}\alpha t\times 86400\]
done
clear
C)
\[\frac{\frac{1}{2}\alpha t\times 86400}{{{\left( 1-\frac{\alpha t}{2} \right)}^{2}}}\]
done
clear
D)
\[\frac{\frac{1}{2}\alpha t\times 86400}{1-\frac{\alpha t}{2}}\]
done
clear
View Answer play_arrow
One mole of a monoatomic ideal gas is mixed with one mole of a diatomic ideal gas. The molar specific heat of the mixture at constant volume is
A)
8
done
clear
B)
\[\frac{3}{2}\,R\]
done
clear
C)
2R
done
clear
D)
2.5 R
done
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View Answer play_arrow
A system is provided with 200 cal of heat and the work done by the system on the surrounding is 40 J. Then its internal energy
A)
Increases by 600 J
done
clear
B)
Decreases by 800 J
done
clear
C)
Increases by 800 J
done
clear
D)
Decreases by 50 J
done
clear
View Answer play_arrow
If the radius and length of a copper rod are both doubled, the rate of flow of heat along the rod increases
A)
4 times
done
clear
B)
2 times
done
clear
C)
8 times
done
clear
D)
16 times
done
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View Answer play_arrow
A plane mirror is placed at the bottom of the tank containing a liquid of refractive index\[\mu \]. P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be
A)
\[2\mu h\]
done
clear
B)
\[\frac{2h}{\mu }\]
done
clear
C)
\[\frac{2h}{\mu -1}\]
done
clear
D)
\[h\left( 1+\frac{1}{\mu } \right)\]
done
clear
View Answer play_arrow
Three rods each of length L and mass M are placed along X, Y and Z-axes in such a way that one end of each of the rod is at the origin. The moment of inertia of this system about Z axis is
A)
\[\frac{2\,M{{L}^{2}}}{3}\]
done
clear
B)
\[\frac{4\,M{{L}^{2}}}{3}\]
done
clear
C)
\[\frac{5\,M{{L}^{2}}}{3}\]
done
clear
D)
\[\frac{M{{L}^{2}}}{3}\]
done
clear
View Answer play_arrow
The total current supplied to the circuit by the battery is
A)
1 A
done
clear
B)
2 A
done
clear
C)
4 A
done
clear
D)
6 A
done
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View Answer play_arrow
A short magnet is allowed to fall along the axis of a horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be
A)
4 m
done
clear
B)
5 m
done
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C)
6 m
done
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D)
7 m
done
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View Answer play_arrow
In the circuit shown in the figure, the ac source gives a voltage\[\operatorname{V}=20 cos \left( 2000 t \right)\]. Neglecting source resistance, the voltmeter and ammeter reading will be
A)
0 V, 0.47 A
done
clear
B)
1.68 V, 0.47 A
done
clear
C)
0 V, 1.4 A
done
clear
D)
5.6 V, 1.4 A
done
clear
View Answer play_arrow
Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
A)
\[n= 2 to\,\,n =1\]
done
clear
B)
\[n =4 to\,\,n = 3\]
done
clear
C)
\[n= 3 \,to\,\,n = 1\]
done
clear
D)
\[n = 4\,\,to\,\,n = 2\]
done
clear
View Answer play_arrow
The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is:
A)
0.467
done
clear
B)
0.502
done
clear
C)
0.513
done
clear
D)
0.556
done
clear
View Answer play_arrow
Faraday's laws of electrolysis are related to the
A)
Atomic number of cation
done
clear
B)
Atomic number of anion
done
clear
C)
Equivalent weight of the electrolyte
done
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D)
Speed of the cation
done
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View Answer play_arrow
The decomposition of \[C{{l}_{2}}{{O}_{7}}\] at 400 K in the gas phase to \[C{{l}_{2}}\] and \[{{O}_{2}}\] is a first-order reaction. After 55 seconds at 400 K the pressure of \[C{{l}_{2}}{{O}_{7}}\] falls from 0.062 to 0.044 atm. The rate constant and pressure of \[C{{l}_{2}}{{O}_{7}}\] after 100 sec of decomposition at this temperature are
A)
\[5.2 \times 1{{0}^{-}}^{4}se{{c}^{-}}^{1}; \,0.05 atm\]
done
clear
B)
\[6.2 \times 1{{0}^{-}}^{3}se{{c}^{-}}^{1}; \,0.033 atm\]
done
clear
C)
\[5.8 \times 1{{0}^{-}}^{3}se{{c}^{-}}^{1}; \,0.44 atm\]
done
clear
D)
\[4.6 \times 1{{0}^{-}}^{3}se{{c}^{-}}^{1}; \,0.005 atm\]
done
clear
View Answer play_arrow
The boiling point of water \[\left( 100{}^\circ C \right)\] becomes\[100.52{}^\circ C\], if 3 grams of a nonvolatile solute is dissolved in 200 ml of water. The molecular weight of solute is (\[{{K}_{b}}\], for water is 0.6 K/m)
A)
\[12.2\,\,g\,mo{{l}^{-1}}\]
done
clear
B)
15.4 g mol
done
clear
C)
\[17.3\,\,g\,mo{{l}^{-1}}\]
done
clear
D)
20.4 g mol
done
clear
View Answer play_arrow
The limiting radius ratio of the complex \[{{\left[ Ni\left( C{{N}_{4}} \right) \right]}^{2-}}\]
A)
0.225-0.414
done
clear
B)
0.414-0.732
done
clear
C)
0.155-0.225
done
clear
D)
None
done
clear
View Answer play_arrow
Which of the following plots represents the behaviour of an ideal binary liquid solution?
A)
Plot of \[{{P}_{total}}\,vs\,{{Y}_{A}}\] (mole fraction of A in vapour phase) is linear
done
clear
B)
Plot of \[{{P}_{total}}\,vs\,{{Y}_{B}}\] is linear
done
clear
C)
Plot of \[1/{{P}_{total}}\,vs\,{{Y}_{A}}\] is linear
done
clear
D)
Plot of \[1/{{P}_{total}}\,vs\,{{Y}_{B}}\] 1s non-linear
done
clear
View Answer play_arrow
Normal boiling point of water is 373 K (at 760 mm). Vapour pressure of water at 298 K is 23 mm. If y the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be
A)
250 K
done
clear
B)
294 K
done
clear
C)
51.6 K
done
clear
D)
12.5 K
done
clear
View Answer play_arrow
The required charge for one equivalent weight n U of silver deposit on cathode is
A)
\[9.65 \times 1{{0}^{7}}C~\]
done
clear
B)
\[9.65 \times 1{{0}^{4}}C~\]
done
clear
C)
\[9.65 \times 1{{0}^{3}}C~\]
done
clear
D)
\[9.65 \times 1{{0}^{5}}C~\]
done
clear
View Answer play_arrow
A substance having a half-life period of 30 minutes decomposes according to the first-order rate law. The fraction is decomposed, and the balance remaining after 1.5 hours and time for \[60%\] decomposition on its doubling the initial concentration will be
A)
87.4; 0.126; 39.7 mins
done
clear
B)
80.6; 0.135; 40.8 mins
done
clear
C)
90.5; 0.144; 2829 mins
done
clear
D)
802; 0.135; 26.6 mins
done
clear
View Answer play_arrow
Which of the following electrolytes is most effective in the coagulation of gold solution?
A)
\[NaN{{O}_{3}}\]
done
clear
B)
\[{{K}_{4}}[Fe(C{{N}_{6}})]\]
done
clear
C)
\[N{{a}_{3}}P{{O}_{4}}\]
done
clear
D)
\[MaC{{l}_{2}}\]
done
clear
View Answer play_arrow
Extraction of Ag from sulphide ore and removal of unreacted silver bromide from photographic plate involve complexes:
A)
\[{{\left[ Ag{{({{S}_{2}}{{O}_{3}})}_{2}} \right]}^{3-}}\,\,in\,\,both\]
done
clear
B)
\[{{[Ag{{(CN)}_{2}}]}^{-}}\,\,in\,\,both\]
done
clear
C)
\[{{[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}^{3-}},\,\,{{[Ag{{(CN)}_{2}}]}^{-}}\,\,respectively\]
done
clear
D)
\[{{[Ag{{(CN)}_{2}}]}^{-}}\,,\,\,{{[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]}^{3-}}\,\,respectively\]
done
clear
View Answer play_arrow
Close packing is maximum in the crystal which is
A)
Simple cube
done
clear
B)
bcc
done
clear
C)
fcc
done
clear
D)
none
done
clear
View Answer play_arrow
A catalyst is used in a reaction to
A)
Change the nature of reaction products
done
clear
B)
Increase the reaction yield
done
clear
C)
Decrease the need for reactants
done
clear
D)
Decrease the time required for the reaction
done
clear
View Answer play_arrow
Which of the following has maximum thermo-dynamic spontaneity at \[400{}^\circ C\]?
A)
\[C+{{O}_{2}}\,\,\xrightarrow{{}}\,\,C{{O}_{2}}\]
done
clear
B)
\[2C\,\,+\,\,{{O}_{2}}\,\,\xrightarrow{{}}\,\,2CO\]
done
clear
C)
\[2CO+{{O}_{2}}\,\,\xrightarrow{{}}\,\,2C{{O}_{2}}\]
done
clear
D)
All have same
done
clear
View Answer play_arrow
The boiling points of the following hydrides follow the order of
A)
\[N{{H}_{3}} > As{{H}_{3}} > P{{H}_{3}} > Sb{{H}_{3}}\]
done
clear
B)
\[Sb{{H}_{3}} > As{{H}_{3}} > P{{H}_{3}} > N{{H}_{3}}\]
done
clear
C)
\[Sb{{H}_{3}} > N{{H}_{3}} > As{{H}_{3}} > P{{H}_{3}}\]
done
clear
D)
\[N{{H}_{3}} > P{{H}_{3}} > As{{H}_{3}} > Sb{{H}_{3}}\]
done
clear
View Answer play_arrow
Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively,
A)
\[Mn{{O}_{2}},\,\,Mn{{O}_{2}},\,\,M{{n}^{2+}}\]
done
clear
B)
\[M{{n}^{2-}}_{4},\,\,M{{n}^{3+}},\,\,M{{n}^{2+}}\]
done
clear
C)
\[Mn{{O}_{2}},\,\,Mn{{O}^{2-}},\,\,M{{n}^{3+}}\]
done
clear
D)
\[MnO,\,\,Mn{{O}_{4}},\,\,M{{n}^{2+}}\]
done
clear
View Answer play_arrow
Which of the following oxyacids of phosphorus is a reducing agent and monobasic?
A)
\[{{\operatorname{H}}_{3}}P{{O}_{2}}\]
done
clear
B)
\[{{\operatorname{H}}_{3}}P{{O}_{3}}\]
done
clear
C)
\[{{\operatorname{H}}_{3}}P{{O}_{4}}\]
done
clear
D)
\[{{H}_{4}}{{P}_{2}}{{O}_{6}}~~\]
done
clear
View Answer play_arrow
In acidic medium potassium dichromate acts as an oxidant according to the equation, \[{{\operatorname{CrO}}_{7}}^{2-}+\,\,14{{H}^{+}}+6{{e}^{-}}\,\,\to \,\,2C{{r}^{3+}}\,+\,\,7{{H}_{2}}O\]. What is the equivalent weight of\[{{\operatorname{K}}_{2}}C{{r}_{2}}{{O}_{7}}\]?\[(\operatorname{mol}. wt.=M)\]
A)
M
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B)
M/2
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C)
M/3
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D)
M/6
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View Answer play_arrow
2-bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is
A)
Pent-1-ene
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B)
cis-pent-2-ene
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C)
trans-pent-2-ene
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D)
2-ethoxypentane
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View Answer play_arrow
In the process of extraction of gold, Roasted gold ore
\[{{\operatorname{CN}}^{-}}+{{H}_{2}}O\,\,\xrightarrow{{{O}_{2}}} [X]\,\,+\,\,O{{H}^{-}}\] \[[X]\,\,+\,\,Zn\,\,\to \,\,[Y]\,\,+\,\,Au\] Identify the complexes [X] and [Y]
A)
\[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
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B)
\[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{4}} \right]}^{3-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
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C)
\[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{6}} \right]}^{4-}}\]
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D)
\[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{4}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
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View Answer play_arrow
In which alkyl halide, \[{{S}_{N}}2\] mechanism is favoured maximum by
A)
\[C{{H}_{3}}Cl\]
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B)
\[C{{H}_{3}}C{{H}_{2}}Cl\]
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C)
\[{{\left( C{{H}_{3}} \right)}_{2}}CHCl\]
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D)
\[{{\left( C{{H}_{3}} \right)}_{3}}C-Cl\]
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View Answer play_arrow
The \[-OH\] group of methyl alcohol cannot be replaced by chlorine by the action of
A)
Chlorine
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B)
Hydrogen chloride
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C)
Phosphorus trichloride
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D)
Phosphorus pentachloride
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View Answer play_arrow
Which of the following will not give a precipitate with\[AgN{{O}_{3}}\]?
A)
\[\left[ Co{{\left( N{{H}_{3}} \right)}_{3}}C{{l}_{3}} \right]\]
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B)
\[\left[ Co{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{2}} \right]Cl\]
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C)
\[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}Cl \right]C{{l}_{2}}\]
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D)
\[\left[ Co{{\left( N{{H}_{3}} \right)}_{6}} \right]C{{l}_{3}}\]
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View Answer play_arrow
The alcohol which easily reacts with cone. HCl is
A)
\[C{{H}_{3}}CHOHC{{H}_{2}}C{{H}_{3}}\]
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B)
\[{{\left( C{{H}_{3}} \right)}_{3}}COH\]
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C)
\[C{{H}_{3}}C{{H}_{2}}{{C}_{2}}C{{H}_{2}}OH\]
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D)
\[{{\left( C{{H}_{3}} \right)}_{3}}CHC{{H}_{2}}OH\]
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View Answer play_arrow
How will you distinguish the products obtained by acidic hydrolysis of I
II
A)
Fehling's solution
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B)
\[NaHS{{O}_{3}}\]
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C)
Brady?s reagent
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D)
Lucas test
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View Answer play_arrow
Mendius reaction involves the
A)
reduction of aldehydes to give alcohols
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B)
Reduction of nitriles with sodium and ethanol
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C)
Oxidation of nitrites
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D)
Hydrolysis of cyanides
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View Answer play_arrow
The two polypeptide chains of insulin are cross- linked at
A)
two places
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B)
three places
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C)
four places
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D)
five places
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View Answer play_arrow
Which of the following amines reacts most rapidly with
A)
done
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B)
done
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C)
done
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D)
done
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View Answer play_arrow
\[\underset{(A)}{\mathop{PhCONH}}\,\xrightarrow[KOBr]{}\,\,(B)\,\,\xrightarrow[MeOH]{}\,(C)\] Product [c] is
A)
\[PhN{{H}_{2}}\]
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B)
\[PhNHCOOMe\]
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C)
\[PhNHCOOPh\]
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D)
None
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View Answer play_arrow
Which one of the following is employed as a tranquillizer?
A)
Naproxen
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B)
Tetracycline
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C)
Chlorpheniramine
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D)
Equanil
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View Answer play_arrow
0.5 gm of fuming \[{{H}_{2}}S{{O}_{4}}\] (oleum) is diluted with water. This solution is completely neutralised by 26.7 ml of 0.4 N NaOH. The percentage of free 803 in the sample is
A)
\[30.6\,%\]
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B)
\[40.6\,%\]
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C)
\[20.6\,%\]
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D)
\[50\,%\]
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View Answer play_arrow
Which one of the following is considered as the main postulates of Bohr?s model of atom?
A)
Protons are present in the nucleus
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B)
Electrons are revolving around the nucleus
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C)
Centrifugal force produced due to the revolving electrons balances the force of attraction between the electron and the protons
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D)
Angular momentum of electron is an integral multiple of \[\frac{h}{2\pi }\]
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View Answer play_arrow
The number of moles present in \[1\,{{m}^{3}}\] of any gas At NTP is
A)
32.4
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B)
54.6
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C)
44.6 g
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D)
28.2
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View Answer play_arrow
Styrene at room temperature is
A)
Solid
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B)
Liquid
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C)
Gas
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D)
Colloidal solution
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View Answer play_arrow
Rutherford?s scattering experiment is related to the size of the
A)
Nucleus
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B)
Atom
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C)
Electron
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D)
Neutron
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View Answer play_arrow
The elements that occupy the peaks of ionisation energy curve are
A)
Na, K, Rb, Cs
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B)
Na, Mg, Cl, I
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C)
Cl, Br, I, F
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D)
He, Ne, Ar, Kr
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View Answer play_arrow
The number of S - S bonds in sulphur trioxide trimer \[{{S}_{3}}{{O}_{9}}\] is
A)
Three
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B)
Two
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C)
One
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D)
Zero
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View Answer play_arrow
In which of the following the central atom does A not use \[s{{p}^{3}}\] hybrid orbitals in its bonding
A)
\[BeF_{3}^{-}\]
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B)
\[OH_{3}^{+}\]
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C)
\[NH_{2}^{{}}\]
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D)
\[N{{F}_{3}}\]
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View Answer play_arrow
The first ionization potentials in electron volts of nitrogen and oxygen atoms are respectively given by
A)
14.6, 13.6
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B)
13.6, 14.6
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C)
13.6, 13.6
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D)
14.6, 14.6
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View Answer play_arrow
What is the value of \[\Delta E\] (heat change at constant volume) for reversible isothermal evaporation of 90 g water\[100{}^\circ C\]. Assuming water vapour behaves as an ideal gas and\\[{{\left( \Delta {{H}_{vap}} \right)}_{water}}=540\,cal\,\,{{g}^{-1}}\].
A)
\[9\times {{10}^{3}}\,cals\]
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B)
\[6\times {{10}^{3}}\,cals\]
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C)
4.49 cals
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D)
none of these
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View Answer play_arrow
Dalton' s law of partial pressure is not applicable to, at normal conditions
A)
\[{{H}_{2}}\,and\,\,{{N}_{3}}\,\,mixture\]
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B)
\[{{H}_{2}}\,and\,\,C{{l}_{2}}\,\,mixture\]
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C)
\[{{H}_{2}}\,and\,\,C{{O}_{2}}\,\,mixture\]
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D)
\[{{H}_{2}}\,and\,\,{{O}_{2}}\,\,mixture\]
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View Answer play_arrow
Calculate \[\Delta G{}^\circ \] for conversion of oxygen to (ozone\[3/2\,{{O}_{2}}(g)\to at\,\,298\,\,K\], at 298 K, if \[{{K}_{p}}\] for this conversion is\[2.47 \times 1{{0}^{-}}^{29}\].
A)
\[1.63 kJ mo{{l}^{-1}}\]
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B)
\[2.4\,\,\times \,\,{{10}^{2}}\,kJ\,mo{{l}^{\text{-}1}}\]
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C)
\[1.63\,\,kJ\,mo{{l}^{\text{-}1}}\]
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D)
\[2.8\,\,\times \,\,{{106}^{2}}\,kJ\,mo{{l}^{\text{-}1}}\]
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View Answer play_arrow
\[\Delta G{}^\circ \left( HI, g \right) \cong +1.7 kJ\]. What is the equilibrium constant at \[25{}^\circ C\] for\[2HI\,(g)\,\,\rightleftharpoons \,\,{{H}_{2}}(g)\,\,+\,\,{{I}_{2}}\,(g)\].
A)
24.0
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B)
3.9
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C)
2.0
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D)
0.5
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View Answer play_arrow
Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a Helium atom is
A)
two times that of hydrogen molecule
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B)
same as that of a hydrogen molecule
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C)
four times that of a hydrogen molecule
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D)
half that of a hydrogen molecule
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View Answer play_arrow
Which of the statement is correct?
A)
Slope of adiabatic \[P-V\] curve will be the same as that of isothermal one.
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B)
Slope of adiabatic \[P-V\] curve is smaller than that in isothermal one.
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C)
Slope of adiabatic \[P-V\] curve is larger than that in isothermal one.
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D)
Slope of adiabatic \[P-V\] curve may be smaller or larger depending on the value V.
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View Answer play_arrow
If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then
A)
He could not discovered independent assortment
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B)
He might have discovered linkage
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C)
He might have discovered crossing over
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D)
He might have not observed dominance
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View Answer play_arrow
Contraction in gall bladder stimulated by
A)
CCK
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B)
PZ
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C)
Secretin
done
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D)
Enterogastrone
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View Answer play_arrow
Water is essential for bryophyta
A)
For fertilization and homosporos nature
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B)
Water should be filled in archegonium for fertilization
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C)
Water is necessary for movement of sperm
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D)
For dissemination of spores
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View Answer play_arrow
Which of the following yields citric acid?
A)
Penicillium citrinum
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B)
Aspergillus niger
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C)
Saccharomyces
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D)
Azospirillum
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View Answer play_arrow
Saccharomyces cerevisiae is used in the formation of
A)
Ethanol
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B)
Methanol
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C)
Acetic acid
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D)
Antibiotics
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View Answer play_arrow
AA Bb Cc genotypes form how many types of gametes
A)
4
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B)
8
done
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C)
2
done
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D)
6
done
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View Answer play_arrow
Indicator of water pollution
A)
E. coli
done
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B)
Chlorella
done
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C)
Beggiatoa
done
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D)
Ulothrix
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View Answer play_arrow
DNA of E. coli
A)
ds circular
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B)
ss circular
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C)
ds linear
done
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D)
ss linear
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View Answer play_arrow
Nucleic acid in HIV
A)
ss RNA
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B)
ds RNA
done
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C)
ss DNA
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D)
ds DNA
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View Answer play_arrow
Knife of DNA
A)
DNA-ligase
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B)
Restriction endonuclease
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C)
Exonuclease
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D)
Peptidase
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View Answer play_arrow
Genetic engineering involves
A)
Use of restriction endonuclease on bacterial DNA and formation of new traits
done
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B)
Use of ligase for cutting DNA
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C)
Developing instruments
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D)
Use of statistic in genetics
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View Answer play_arrow
Which is wrong for cytochrome P-450?
A)
It contains Fe
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B)
It concerns with oxidation
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C)
It is a pigment
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D)
It is a coloured cell
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View Answer play_arrow
Enamel of teeth is secreted by
A)
Ameloblast
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B)
Odontoblast
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C)
Osteoblast
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D)
Osteoclast
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View Answer play_arrow
If a female having gene for haemophilia and colour blindness on its one X-chromosome marries a normal male, then what are the chances in their offspring
A)
\[50\,%\] son are diseased and \[50\,%\] are normal
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B)
All normal offspring
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C)
\[100%\] daughters are carrier
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D)
\[100%\] son are diseased
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View Answer play_arrow
First child of a normal male and female is albino, what are the chances of second child to be albino
A)
\[25\,%\]
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B)
\[50\,%\]
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C)
\[75\,%\]
done
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D)
\[100\,%\]
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View Answer play_arrow
Species separated by geographical barriers are called
A)
Allopatric
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B)
Sympatric
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C)
Sibling
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D)
Endemic
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View Answer play_arrow
Point mutation induced by
A)
Adenine
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B)
Guanine
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C)
3-cytosine
done
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D)
Bromouracil
done
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View Answer play_arrow
Reason for trisomy in Down's syndrome
A)
Non-disjunction during sperm formation
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B)
Non-disjunction during egg formation
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C)
Non-disjunction at the time of egg or sperm formation
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D)
Addition of one extra chromosome during mitosis
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View Answer play_arrow
Multivalent chromosome form by
A)
Inversion
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B)
Deletion
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C)
Reciprocal translocation
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D)
Point mutation
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View Answer play_arrow
A cup has 105 bacterial cells. Each bacterial cell divides into 35 minutes. What shall be the number of bacteria after 175 min?
A)
\[2\,\,\times \,\,{{10}^{5}}\]
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B)
\[5\,\,\times \,\,{{10}^{5}}\]
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C)
\[32\,\,\times \,\,{{10}^{5}}\]
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D)
\[16\,\,\times \,\,{{10}^{5}}\]
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View Answer play_arrow
Deficiency of protein leads to
A)
Rickets
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B)
Scurvy
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C)
Kwashiorkor
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D)
Carotenemia
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View Answer play_arrow
Lactose is composed of
A)
Glucose + galactose
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B)
Glucose + fructose
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C)
Glucose + glucose
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D)
Glucose + mannose
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View Answer play_arrow
True statement for cellulose molecule
A)
\[\beta \] -1-4 linkage, unbranched
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B)
\[\beta \]-1-4 linkage, branched
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C)
\[\beta \] -1-4 linkage, branched
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D)
\[\beta \] -1-6 linkage, unbranched
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View Answer play_arrow
True statement for Ulothrix
A)
Filamentous thallus and flagellated reproductive structures
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B)
Branched thallus
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C)
Flagellated cells absent
done
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D)
None of the above
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View Answer play_arrow
Which of the following exercise a control over transcription?
A)
Operator
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B)
Regulator
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C)
Promoter
done
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D)
Recon
done
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View Answer play_arrow
Vitamin which induces maturation of RBC
A)
B1
done
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B)
A
done
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C)
B12
done
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D)
D
done
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View Answer play_arrow
Lower jaw is composed of
A)
Dentary
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B)
Maxilla
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C)
Premaxilla
done
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D)
Palatine
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View Answer play_arrow
Number of bones in hind limb of man is
A)
14
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B)
24
done
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C)
26
done
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D)
30
done
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View Answer play_arrow
Which of the following stimulates the secretion of gastric juice?
A)
Gastrin
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B)
Enterogastrone
done
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C)
Secretin
done
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D)
Hepatocrinin
done
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View Answer play_arrow
Age of Dryopithecus is
A)
2.46 crore years
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B)
2.46 lakh year
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C)
1 lakh year
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D)
1 crore year
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View Answer play_arrow
Which of the following statement is true?
A)
Homo erectus is direct ancestor of Homo sapiens
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B)
Neanderthal man is direct ancestor of modem man
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C)
Australopithecus is direct ancestor of modem man
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D)
Fossils of Cro-Magnon man first found in Ethiopia
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View Answer play_arrow
Which statement is wrong for Cycas?
A)
Xylems have vessels
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B)
Female flowers are well developed
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C)
It has coralloid roots
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D)
Circinate ptyxis
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View Answer play_arrow
Evolution of heart from one to two, three and four chambered proves
A)
Biogenetic law of Haeckel
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B)
Lamarckism
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C)
Hardy-Weinberg?s law
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D)
Neo-Darwinism
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View Answer play_arrow
What is necessary for ripening of fruits?
A)
\[80\,%\] of ethylene
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B)
Abscisic acid
done
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C)
2, 4 D
done
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D)
A.M.O.-16
done
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View Answer play_arrow
Which of the following induces morphogeness in tissue culture?
A)
Gibberellins
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B)
Cytokmin
done
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C)
IAA
done
clear
D)
Ethylene
done
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View Answer play_arrow
Which weedicide can defoliate the complete forest?
A)
2, 4-D
done
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B)
AMO-1618
done
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C)
MH
done
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D)
ABA
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View Answer play_arrow
Heterosis (Hybrid vigour) desirable in vegetatively propagated plants because
A)
Heterosis is maintained for a longer duration
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B)
These plants are easy to cultivate
done
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C)
Vegetative reproduction help to multiply fast
done
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D)
It is due to homozygosity
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View Answer play_arrow
What is correct for stages of Puccinia?
A)
Telia and aecia on wheat
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B)
Telia and uredo stage on wheat
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C)
Telia and aecia on barberry
done
clear
D)
None
done
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View Answer play_arrow
Typhoid is caused by
A)
Rickettsiae
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B)
Chlamydia
done
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C)
Salmonella typhi
done
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D)
Mycobacterium
done
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View Answer play_arrow
Agent orange is
A)
Biodegradable insecticide
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B)
Di auxin (2-4, D and 2, 4, 5 T) weedicide
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C)
Biofertilizer
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D)
Biopesticide
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View Answer play_arrow
Largest sperm is of
A)
Pinus
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B)
Cycas
done
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C)
Ephedra
done
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D)
Sequoia
done
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View Answer play_arrow
Hollow air filled bones (pneumatic bones) occur in
A)
Mammals
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B)
Reptiles
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C)
Urodela
done
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D)
Aves
done
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View Answer play_arrow
Non-symbiotic nitrogen fixing bacteria are
A)
Rhizobium
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B)
Azospirillum
done
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C)
Azotobacter
done
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D)
Nitrosomonas
done
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View Answer play_arrow
Extrastellar secondary growth takes place by
A)
Vascular cambium
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B)
Phellogen
done
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C)
Phellem
done
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D)
Phelloderm
done
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View Answer play_arrow
If \[C{{O}_{2}}\] is absent in atmosphere of earth, then
A)
temperature will decrease
done
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B)
temperature will increase
done
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C)
plants will flourish well
done
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D)
no effect
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View Answer play_arrow
Acacia, Prosopis and Capparis belong to
A)
Deciduous forest
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B)
Tropical forest
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C)
Thorn forest
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D)
Evergreen forest
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View Answer play_arrow
Animals of desert are
A)
Arboreal
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B)
Fossorial
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C)
Crepuscular
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D)
Nocturnal
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View Answer play_arrow
Which part does not have only involuntary muscles?
A)
Urethra
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B)
Irish
done
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C)
Heart muscles
done
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D)
Blood vessels
done
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View Answer play_arrow
Solenocytes occur in
A)
Platyhelminthes
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B)
Arthropoda
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C)
Annelida
done
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D)
Aschelminthes
done
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View Answer play_arrow
Which characteristic is true for Obelia?
A)
Metagenesis
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B)
Morphogenesis
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C)
Apolysis
done
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D)
Pedogeny
done
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View Answer play_arrow
In angiosperm, characters of flowers are used in classification because
A)
Characters of flowers are conservative
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B)
Flowers are large
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C)
Flowers are attractive
done
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D)
None of the above
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View Answer play_arrow
Transport of gases in alveoli takes place by
A)
Active transport
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B)
Passive transport
done
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C)
Simple diffusion
done
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D)
None
done
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View Answer play_arrow
Oral contraceptives contain
A)
Progesterone
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B)
LH
done
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C)
Oxytocin
done
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D)
Sterols
done
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View Answer play_arrow
In S-phase, DNA is replicated in a medium containing radioactive thymidine, radioactivity will be observed in
A)
Euchromatin
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B)
Heterochromatin
done
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C)
Both
done
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D)
Nucleolus
done
clear
View Answer play_arrow
CO is harmful because
A)
It forms stable compound with hemoglobin
done
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B)
It blocks mitosis
done
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C)
It is mutagenic
done
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D)
It causes defoliation
done
clear
View Answer play_arrow
Function of thyrocalcitonin
A)
To reduce the calcium level in blood
done
clear
B)
To increase the calcium level in blood
done
clear
C)
Oppose the action of thyroxine
done
clear
D)
Maturation of gonads
done
clear
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Osmotic potential and water potential of pure water respectively
A)
0 and 0
done
clear
B)
0 and 1
done
clear
C)
100 and 0
done
clear
D)
100 and 100
done
clear
View Answer play_arrow
A normal leaf cell have how many genomes
A)
1
done
clear
B)
2
done
clear
C)
3
done
clear
D)
4
done
clear
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Contractile protein is
A)
Actin
done
clear
B)
Myosin
done
clear
C)
Troponin
done
clear
D)
Tropomyosin
done
clear
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Unit of contraction is
A)
Sarcomere
done
clear
B)
Muscle fiber
done
clear
C)
Actin
done
clear
D)
None
done
clear
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Oxidation of palmitic acid yields
A)
129ATP
done
clear
B)
132ATP
done
clear
C)
36ATP
done
clear
D)
76ATP
done
clear
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Total amount of energy trapped by green plants in food is called
A)
Gross primary production
done
clear
B)
Net primary production
done
clear
C)
Standing crop
done
clear
D)
Standing state
done
clear
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Role of microtubules
A)
To help in cell division
done
clear
B)
Cell membrane formation
done
clear
C)
Respiration
done
clear
D)
Pinocytosis
done
clear
View Answer play_arrow
Difference between eukaryotes and prokaryotes
A)
ss circular DNA in prokaryotes
done
clear
B)
Histone with prokaryotic DNA
done
clear
C)
Operon in eukaryotes
done
clear
D)
Membrane bound organelles in eukaryotes
done
clear
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According to five kingdom system blue green algae belongs to
A)
Metaphyta
done
clear
B)
Monera
done
clear
C)
Protista
done
clear
D)
Algae
done
clear
View Answer play_arrow
Bacteria are essential in carbon cycle as
A)
Decomposer
done
clear
B)
Synthesizer
done
clear
C)
Consumer
done
clear
D)
Pri. Producer
done
clear
View Answer play_arrow
What occurs in crossing over?
A)
Recombination
done
clear
B)
Mutation
done
clear
C)
Independent assortment
done
clear
D)
None
done
clear
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Histamine secreted by
A)
Mast cells
done
clear
B)
Fibroblast
done
clear
C)
Histiocytes
done
clear
D)
Plasma cells
done
clear
View Answer play_arrow
Arterial blood pressure in human beings is
A)
120 and 80 mm Hg
done
clear
B)
150 and 100 mm Hg
done
clear
C)
50 and 100 mm Hg
done
clear
D)
None of these
done
clear
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Which of the following survives a temperature of\[104\text{ }to\text{ }106{}^\circ C\]?
A)
Marine archaebacteria
done
clear
B)
Hot water spring thermophiles
done
clear
C)
Seeds of angiosperms
done
clear
D)
Eubacteria
done
clear
View Answer play_arrow
Mental retardation in man occurs due to
A)
Loss of one X chromosome
done
clear
B)
Addition of one X chromosome
done
clear
C)
Slight growth in Y
done
clear
D)
Overgrowth in Y
done
clear
View Answer play_arrow
Symptoms of lathyrism
A)
Bone deformation
done
clear
B)
Muscular dystrophy and paralysis
done
clear
C)
Asphyxia
done
clear
D)
Cardiac arrest
done
clear
View Answer play_arrow
A cell 'A' with \[\operatorname{D}.P.D. = 8\] is surrounded by three cells 'B', 'C' and 'D' with D.P.D. respectively 4, 6 and 5. What shall be the direction of water movement?
A)
done
clear
B)
\[A\to B\to C\to D\]
done
clear
C)
\[D\to C\to B\to A\]
done
clear
D)
\[A\to B\to C\to D\]
done
clear
View Answer play_arrow
What change occurs during conversion of proto chlorophyll to chlorophyll?
A)
Addition of 2H in one pyrrole ring
done
clear
B)
Loss of 2H
done
clear
C)
Addition of Mg
done
clear
D)
Loss of Mg
done
clear
View Answer play_arrow
Transduction in bacteria carried out by
A)
Bacteriophage
done
clear
B)
B.G.A.
done
clear
C)
Mycoplasma
done
clear
D)
Rickettsiae
done
clear
View Answer play_arrow
Which of the following is most used in genetic engineering?
A)
E. coli and Agrobacterium
done
clear
B)
Mycobacteria and Salmonella
done
clear
C)
Aspergillus
done
clear
D)
Penicillium
done
clear
View Answer play_arrow
Variations in proteins are due to
A)
Sequence of amino acids
done
clear
B)
Number of amino acids
done
clear
C)
R-group
done
clear
D)
None of these
done
clear
View Answer play_arrow
Genetic drift in Mendelian population takes place in
A)
Small population
done
clear
B)
Large population
done
clear
C)
Oceanic population
done
clear
D)
Never occurs
done
clear
View Answer play_arrow
Embryo of sunflower has
A)
Two cotyledons
done
clear
B)
One cotyledons
done
clear
C)
Eight cotyledons
done
clear
D)
Cotyledons absent
done
clear
View Answer play_arrow
Effect of light and dark rhythm on plants is
A)
Photonasty
done
clear
B)
Phototropism
done
clear
C)
Photoperiodism
done
clear
D)
Photomorphogenesis
done
clear
View Answer play_arrow
ABO blood group has
A)
Two codominants and one recessive allele
done
clear
B)
Two codominants and two recessive alleles
done
clear
C)
Two incompletely dominant genes
done
clear
D)
Two pseudo alleles
done
clear
View Answer play_arrow
Walking fem name of Adiantum is due to
A)
Dispersal by animals
done
clear
B)
Reproduction by spores
done
clear
C)
Vegetative reproduction
done
clear
D)
Power of locomotion
done
clear
View Answer play_arrow
Modem farmers can increase the yield of paddy up to \[50\,%\] by the use of
A)
Cyanobacteria
done
clear
B)
Rhizobium
done
clear
C)
Cyanobacteria in Azolla pinnata
done
clear
D)
Farm yard manure
done
clear
View Answer play_arrow
Which of the following destroys the acetyl choline esterase
A)
Malathion
done
clear
B)
CO
done
clear
C)
KCN
done
clear
D)
Colchicine
done
clear
View Answer play_arrow
Growth of leaf primordia is
A)
First apical then marginal
done
clear
B)
Only apical
done
clear
C)
Only marginal
done
clear
D)
Lateral
done
clear
View Answer play_arrow
Reason for elimination of wild life is
A)
Deforestation
done
clear
B)
Forest fire
done
clear
C)
Floods
done
clear
D)
Less Rain fall
done
clear
View Answer play_arrow
Besides \[{{\operatorname{CH}}_{4}}\,\,and\,\,C{{O}_{2}}\], other greenhouse gas from agriculture area is
A)
\[S{{O}_{2}}\]
done
clear
B)
\[N{{H}_{3}}\]
done
clear
C)
\[N{{O}_{2}}\]
done
clear
D)
CFC
done
clear
View Answer play_arrow
In which biome a new plant may adapt soon
A)
Tropical rain forest
done
clear
B)
Desert
done
clear
C)
Mangrove
done
clear
D)
Sea island
done
clear
View Answer play_arrow
In present times the origin of life is not possible from inorganic compounds due to
A)
Raw material not available
done
clear
B)
High cone of \[{{O}_{2}}\] in atmosphere
done
clear
C)
Decrease in temperature
done
clear
D)
Excess of pollution
done
clear
View Answer play_arrow
On Galapagos island Darwin observed variation in beaks of birds (Darwin's finches) and he concluded
A)
Interspecies variation
done
clear
B)
Intraspecies variation
done
clear
C)
Natural selection according to food
done
clear
D)
Inheritance of acquired characters
done
clear
View Answer play_arrow