# Solved papers for JCECE Medical JCECE Medical Solved Paper-2015

### done JCECE Medical Solved Paper-2015

• question_answer1) A vector of magnitude $|\psi |$ is turned through angle $\frac{\text{o }\!\!|\!\!\text{ }}{2}.$ The magnitude of change in the vector is given by A) $2|\psi ||cos\,o|/4|$

B) $|\psi ||sino|/4|$

C) $|\psi {{|}^{2}}|sino|/4{{|}^{2}}$

D) $2|\psi ||sino|/4|$

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• question_answer2) A transmitting antenna of height A and the receiving antenna of height$\frac{3}{4}h$ are separated by a distance of d for satisfactory communication in line-of-sight mode. Then, the value of h is [Given, radius of the earth is R] A) $\frac{{{d}^{2}}}{2R}{{(2\sqrt{2}-\sqrt{6})}^{2}}$

B) $\frac{{{d}^{2}}}{4R}{{(2\sqrt{2}-\sqrt{6})}^{2}}$

C) $\frac{{{d}^{2}}}{R}{{(2\sqrt{2}-\sqrt{6})}^{2}}$

D) $\frac{{{d}^{2}}}{8R}{{(2\sqrt{2}-\sqrt{6})}^{2}}$

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• question_answer3) The difference of sound levels between two points is 40 dB. What is the ratio of pressure amplitudes between the two points?

A) 10

B) 200

C) 100

D) 400

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• question_answer4) With a standard rectangular bar magnet of length (L), breadth $(b;b<<I)$ and magnetic moment M, the time period of the magnet in a vibration magnetometer is 8 s. If the magnet is cut normal to its length into 8 equal pieces, then the time period (in second) with one of the pieces is A) 8 s

B) 2 s

C) 1 s

D) 4 s

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• question_answer5) A disc of radius a and mass m is pivoted at the rim and is set in small oscillation. If a simple pendulum have the same period as that of the disc, then the length of the simple pendulum should be A) $\frac{5}{2}a$

B) $\frac{3}{2}a$

C) $\frac{7}{2}a$

D) $\frac{1}{2}a$

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• question_answer6) The effective resistance across the points P and Q is A) $\frac{r}{4}$

B) $\frac{r}{2}$

C) $\frac{r}{8}$

D) $\frac{r}{16}$

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• question_answer7) A physical quantity X is represented by $X=[{{M}^{\eta }}{{L}^{-\theta }}{{T}^{-\text{o }\!\!|\!\!\text{ }}}].$The maximum percentage errors in the measurement of M, L and T, respectively are $\alpha %,\beta %$and$\gamma %.$The maximum percentage error in the measurement of X will be

A) $(\eta \alpha -\theta \beta -\text{o}|\gamma )%$

B) $(\theta \beta +\text{o}|\gamma -\eta \alpha \,\,)%$

C) $\left( \frac{\alpha }{\eta }-\frac{\beta }{\theta }-\frac{\gamma }{\text{o}|} \right)%$

D) $(\eta \alpha +\theta \beta +o|\gamma )%$

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• question_answer8) A Galilean telescope has an objective of focal length 200 cm and magnifying power 100. What is the distance between the two lenses in normal?

A) 98 cm

B) 198 cm

C) 298 cm

D) 3 m

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• question_answer9) An elliptically shaped ring of dimensions shown in figure just touches, the horizontal surface of a liquid of surface tension S. The force required to pull the ring away from the liquid surface is A) $2\pi (\sqrt{{{a}_{1}}{{b}_{1}}}+\sqrt{{{a}_{2}}{{b}_{2}}})S$

B) $\pi ({{a}_{1}}+{{b}_{1}}+{{a}_{2}}+{{b}_{2}})S$

C) $\pi \left( \frac{{{a}_{1}}+{{a}_{2}}}{2}+\frac{{{b}_{1}}+{{b}_{2}}}{2} \right)S$

D) $\sqrt{2\pi }(\sqrt{{{a}_{1}}{{b}_{1}}}+\sqrt{{{a}_{2}}{{b}_{2}}})S$

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• question_answer10) A $50\,\Omega$galvanometer is shunted by a resistance of $5\,\Omega .$ The percentage of the total current, which passes through the galvanometer is

A) 8.1%

B) 10.1%

C) 11.1%

D) 9.1%

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• question_answer11) An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy $\frac{{{E}_{0}}}{4}.$ Its potential energy is A) $\frac{{{E}_{0}}}{4}$

B) $\frac{{{E}_{0}}}{2}$

C) $\frac{{{E}_{0}}}{8}$

D) ${{E}_{0}}$

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• question_answer12) A plano-convex glass lens $({{\mu }_{g}}=3/2)$ of radius of curvature $R=20\text{ }cm$is placed at a distance a from a concave lens of focal length 40 cm. What should be the distance b of a point object O from plano-convex lens so that the position of final image is independent of a? A) 20 cm

B) 60 cm

C) 40 cm

D) 30 cm

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• question_answer13) In the figure, the ball P is released from rest, when the spring is at its natural length. For the block Q of mass $2{{m}_{0}}$to leave contact with ground at some stage, the minimum mass of P must be A) ${{m}_{0}}$

B) $2{{m}_{0}}$

C) ${{m}_{0}}/2$

D) ${{m}_{0}}/4$

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• question_answer14) Consider the circuit, the current through the Zener diode is A) 20 mA

B) 10 mA

C) 15 mA

D) 40 mA

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• question_answer15) The potential energy of a particle varies with height A from a fixed point as $E=\left( \frac{P\sqrt{h}}{h+Q} \right)$where, P and Q are constants. The dimensions of PQ are

A) $[M{{L}^{2}}{{T}^{-2}}]$

B) $[{{M}^{3/2}}{{L}^{3/2}}{{T}^{-2}}]$

C) $[{{M}^{7/2}}{{T}^{-2}}]$

D) $[M{{L}^{3/2}}{{T}^{-2}}]$

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• question_answer16) Figure shows two convex lenses P and Q, each made up of three different transparent materials. The number of images formed of an object kept on the principal axis of lenses P and Q respectively A) 3 and 1

B) 3 and 3

C) 3 and 2

D) 1 and 3

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• question_answer17) What is the minimum acceleration $({{a}_{o}})$ of the cart in the given figure so that block P will not fall? (Assume coefficient of friction as$\mu$). A) $g/\sqrt{\mu }$

B) $g/\mu$

C) $2\mu g$

D) ${{\mu }^{2}}g$

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• question_answer18) The output resistance of a common emitter transistor amplifier, if the input resistance is $200\,\Omega$ ($\alpha =0.98$and power gain is $5\times {{10}^{6}},$is)

A) $516\,k\Omega$

B) $216\,k\Omega$

C) $300\,k\Omega$

D) $416\,k\Omega$

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• question_answer19) In the shown figure, length of the rod is L, area of cross-section A, Youngs modulus of the material of the rod is Y. Then, B and A is subjected to a tensile force ${{F}_{A}}$while force applied at end $B,{{F}_{B}}$is lesser than ${{F}_{A}}.$Total change in length of the rod will be A) ${{F}_{A}}\times \frac{L}{2AY}$

B) ${{F}_{B}}\times \frac{L}{2AY}$

C) $\frac{({{F}_{A}}+{{F}_{B}})}{2AY}$

D) $\frac{({{F}_{A}}-{{F}_{B}})L}{2AY}$

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• question_answer20) A long insulated copper wire is closely wound as a spiral of ${{N}_{0}}$turn. The spiral lies in they-z plane and a steady current ${{I}_{0}}$flows through the wire. The X-component of the magnetic field at the centre of the spiral is (assume inner radius as ${{R}_{1}}$and outer radius as ${{R}_{2}}$). A) $\frac{{{\mu }_{0}}{{N}_{0}}{{l}_{0}}}{4({{R}_{2}}-{{R}_{1}})}\,\,\ln \,({{R}_{2}}/{{R}_{1}})$

B) $\frac{2{{\mu }_{0}}{{N}_{0}}{{l}_{0}}}{{{R}_{2}}-{{R}_{1}}}\,\,\ln \,({{R}_{2}}/{{R}_{1}})$

C) $\frac{{{\mu }_{0}}{{N}_{0}}{{l}_{0}}}{2({{R}_{2}}-{{R}_{1}})}\,\,\ln \,{{({{R}_{2}}/{{R}_{1}})}^{2}}$

D) $\frac{{{\mu }_{0}}{{N}_{0}}{{l}_{0}}}{2({{R}_{2}}-{{R}_{1}})}\,\,\ln \,({{R}_{2}}/{{R}_{1}})$

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• question_answer21) A cable in the form of a spiral roll (shown in the figure) has a linear density $\rho .$It is uncoiled at a uniform speed v. If the total length of the cable is L. The work done in uncoiling the cable is A) $\rho L{{v}^{2}}/4$

B) $\rho L{{v}^{2}}/2$

C) $\rho L{{v}^{2}}/3$

D) $\rho L{{v}^{2}}$

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• question_answer22) A person can see objects clearly only upto a maximum distance of 60 cm. His eye defect, nature of the corrective lens and its focal length are respectively

A) myopia, convex, 60 cm

B) myopia, concave, 60 cm

C) hypermetropia, concave, 60 cm

D) contract, convex, 60 cm

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• question_answer23) Consider two identical iron spheres P and Q, one which lie on a thermally insulating plate, while the other hangs from an insulated thread. Equal amount of heat (AQ) is supplied to the two spheres. Then, A) the temperature of Q will be greater than P

B) the temperature of P will be greater than Q

C) their temperature will be equal

D) cant be predicted

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• question_answer24) A plane electromagnetic wave of frequency 50 MHz travels in free space along the X-direction. At a particular point in space $E=7.2\,\hat{J}\,V/m.$At this point, B is equal to

A) $8.4\times {{10}^{-8}}\hat{k}T$

B) $2.4\times {{10}^{-8}}\hat{k}T$

C) $7.4\times {{10}^{-6}}\hat{i}T$

D) $2.4\times {{10}^{-8}}\hat{j}T$

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• question_answer25) Two tuning forks P and Q sounded together and 6 beats per second are heard. P is in unison with a 30 cm air column open at both ends and Q is in resonance when length of air column is increased by 2 cm. The frequencies of forks P and Q are

A) 90 Hz and 84 Hz

B) 100 Hz and 106 Hz

C) 96 Hz and 90 Hz

D) 206 Hz and 200 Hz

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• question_answer26) An electrical cable having a resistance of $0.4\,\Omega$delivers 20 kW at 400V DC to a factory. What is the efficiency of transformer?

A) 89.5%

B) 99.5%

C) 79.5%

D) 90.5%

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• question_answer27) Consider a track having frictional coefficient $\mu .$A block of mass m is released from point P situated at height $h.$Which of the following is correct? A) It can reach at V

B) It cannot reach at V

C) It can reach at V, if $\mu$is reduced to $\mu /2$

D) It can reach at V, if $\mu$is increased to$2\mu$

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• question_answer28) Suppose, we split a spherical surface into two parts by a circular loop. Now, a bar magnet is placed near the spherical system as shown in the figure. Through which of the two parts is the magnitude of the magnetic flux larger?

A) Part I

B) Part II

C) The magnitude of the flux is same for both

D) Cannot be predicted without more information about magnetic field

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• question_answer29) A partition divides a container having insulated walls into two compartments. The same gas fills the two compartments (see figure). The ratio of the number of molecules is compartments I and II is A) 1:6

B) 1:6

C) 4:1

D) 1:4

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• question_answer30) In the circuit shown in the figure, the AC source gives a voltage $V=10\sin (1000\,t).$Neglecting source resistance, the voltmeter and ammeter reading will be A) $20\sqrt{\frac{25}{538}}\,V$and $\frac{10}{\sqrt{538}}A$

B) $10\sqrt{\frac{250}{528}}\,V$and $\frac{10}{\sqrt{538}}A$

C) $\sqrt{\frac{250}{538}}\,V$and $\frac{1}{\sqrt{538}}A$

D) $\sqrt{\frac{125}{539}}\,V$and $\frac{1}{\sqrt{538}}\,A$

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• question_answer31) The amplitude of a wave disturbance propagating in the positive X-direction is given by $y=\frac{1}{2+{{x}^{2}}}$at $t=0$and $y=\frac{1}{[2+{{(x-1)}^{2}}]}$at $t=3s,$where$x$ and y are in metre. If the shape of the wave disturbance does not change during the propagation, the velocity of the wave is

A) $\frac{1}{2}m{{s}^{-1}}$

B) $\frac{1}{3}m{{s}^{-1}}$

C) $\frac{1}{4}m{{s}^{-1}}$

D) $\frac{1}{5}m{{s}^{-1}}$

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• question_answer32) Assume an YDSE that has different slits width, as a result, amplitude of waves from two slits are 2A and 4A respectively. If $4{{I}_{0}}$ be the maximum intensity of the interference pattern, then intensity of the pattern of a point, where phase difference between waves is $2\text{o }\!\!|\!\!\text{ ,}$ is

A) $4{{l}_{0}}{{\cos }^{2}}\text{o}|/2$

B) $\frac{4{{l}_{0}}}{3}{{\sin }^{2}}\text{o }\!\!|\!\!\text{ }$

C) $\frac{4{{l}_{0}}}{9}[5+4cos2o|]$

D) $\frac{4{{l}_{0}}}{9}[5+8cos2o|]$

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• question_answer33) A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass and of coefficient of restitution [e]. The ratio of velocities of the two spheres, after collision will be A) $\frac{1-e}{1+e}$

B) $\frac{e}{e+1}$

C) 2/e

D) $\frac{e+1}{2e}$

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• question_answer34) The circuit is equivalent to A) NOR gate

B) AND gate

C) NAND gate

D) OR gate

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• question_answer35) A particle of mass m is located in a unidimensional potential field, where the potential energy of the particle depends on the coordinates as $U(x)={{U}_{0}}$$(1-\sin bx);$ where ${{U}_{0}}$and b are constant. Find the period of small oscillations that the particle performs about the equilibrium position.

A) $\frac{2\pi }{{{b}^{2}}}\sqrt{\frac{m}{{{U}_{0}}}}$

B) $\frac{\pi }{b}\sqrt{\frac{m}{{{U}_{0}}}}$

C) $\frac{{{\pi }^{2}}}{2b}\sqrt{\frac{m}{{{U}_{0}}}}$

D) $\frac{2\pi }{b}\sqrt{\frac{m}{{{U}_{0}}}}$

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• question_answer36) A square loop of side length $a$ having$n$ turns is kept in a horizontal plane. A uniform magnetic field B exists in vertical direction as shown in figure. Now, the loop is rotated with constant angular speed $\omega$as shown below. (i) (ii)  Which of the following statement is correct?

A) Same emf is induced in both cases (i) and (ii)

B) Maximum emf is induced in case (i)

C) Emf induced in case (ii) is more than (i)

D) No emf induced in case (ii)

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• question_answer37) Two blocks are resting on ground with masses ${{m}_{1}}$and${{m}_{2}}.$ A string connects them which goes over a mass less pulley P. There is no friction between pulley and string. A force F is applied on pulley P. The acceleration of centre of mass of blocks is (Given that $T=2{{m}_{1}}g$and ${{m}_{2}}=3{{m}_{1}}$ A) $g/8$

B) $g/4$

C) $\frac{g}{2}$

D) g

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• question_answer38) The binding energy per nucleon of ${{C}^{12}}$is${{E}_{1}}$ and that of ${{C}^{13}}$ is ${{E}_{2}}.$ The energy required to remove one neutron from ${{C}^{13}}$is

A) $12{{E}_{1}}+12{{E}_{2}}$

B) $13{{E}_{2}}-12{{E}_{1}}$

C) $12{{E}_{2}}-13{{E}_{1}}$

D) $13{{E}_{2}}+12{{E}_{1}}$

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• question_answer39) One mole of an ideal gas is taken from state P to state Q by three different processes (i) PRQ, (ii) PSQ and (iii) PTQ as shown in the p - V diagram. The heat absorbed by the gas is A) the least in process (ii)

B) greater in process (ii) than in process (i)

C) the same in the processes (i) and (iii)

D) less in process (iii) than in process (ii)

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• question_answer40) $_{87}^{221}$undergoes radioactive decay with a half-life of 4 days. The probability that a Ra nucleus will disintegrate in 8 days is

A) $\frac{1}{2}$

B) $\frac{3}{8}$

C) $\frac{1}{4}$

D) $\frac{3}{4}$

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• question_answer41) A uniform rod of mass m and length L is rotated about an axis passing through the point P as shown in figure. The magnitude of angular momentum of the rod about the rotational axis yy passing through the point P is A) $\frac{M{{L}^{2}}}{18}$

B) $\frac{M{{(x+y)}^{2}}}{9}$

C) $\frac{M({{L}^{2}}+{{x}^{2}})}{9}$

D) $\frac{M({{L}^{2}}+2{{y}^{2}})}{18}$

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• question_answer42) A stationary hydrogen atom emits photon corresponding to the first line of Lyman series. If R is the Rydbergs constant and $m$ is the mass of the atom, then the velocity acquired by the atom is (neglect energy absorbed by the photon)

A) $\frac{4m}{Rh}$

B) $\frac{Rh}{4m}$

C) $\frac{3Rh}{4m}$

D) $\frac{4m}{3Rh}$

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• question_answer43) Three metal rods of same length and area of cross-section are arranged to form an equilateral triangle as shown in figure. S is the middle point of side QR. If PS is independent of temperature, then [${{\alpha }_{1}}$ is coefficient of linear expansion for rod QR and ${{\alpha }_{2}}$is that for PQ and PR]

A) ${{\alpha }_{1}}=2{{\alpha }_{2}}$

B) ${{\alpha }_{1}}={{\alpha }_{2}}/2$

C) ${{\alpha }_{1}}={{\alpha }_{2}}$

D) ${{\alpha }_{1}}=4{{\alpha }_{2}}$

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• question_answer44) A graph regarding photoelectric effect is shown between the maximum kinetic energy of electrons and the frequency of the incident light. On the basis of the data as shown in the graph, calculate the work function. A) 4eV

B) 2eV

C) 4.2eV

D) 2.5eV

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• question_answer45) A tetrahedral is consisting of 6 identical wires as shown in the figure. Each wire is having a resistance of $4\Omega .$ When an ideal cell of emf $5\,V$is connected across AB as shown, then current through OR is A) 4A

B) $\frac{6}{19}A$

C) zero

D) 1 A

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• question_answer46) A stone is projected from the point on the ground in such a direction so as to hit a bird on the top of a telegraph post of height and then attain the maximum height $3h/2$above the ground. If at the instant of projection, the bird were to fly away horizontally with uniform speed. Find the ratio between horizontal velocities of the bird and stone, if the stone still hits the bird while decreasing.

A) $\sqrt{3}-1$

B) $1/\sqrt{3}-1$

C) $\sqrt{3}+1$

D) $1/\sqrt{3}+1$

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• question_answer47) Four equal capacitors are connected to a battery as shown in the adjoining figure. The potentials of P and Q are A) 5V and 5V

B) 10 V and 5V

C) 10 V and$-10\text{ }V$

D) 5 V and $-5V$

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• question_answer48) Three charges ${{q}_{1}}=2\times {{10}^{-6}}C,$and ${{q}_{2}}=3\times {{10}^{-6}}C$and ${{q}_{3}}=-6\times {{10}^{-6}}C$have been placed as shown in figure. Then, the net electric flux will be minimum for the surface A) ${{S}_{1}}$

B) ${{S}_{2}}$

C) ${{S}_{3}}$

D) same for all

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• question_answer49) Find the electric field vector at P(b, b, b) due to three infinitely long lines of charges along $x,y$and z-axes, respectively. The charge density, i.e. charge per unit length of each wire is $\sigma .$ A) $\frac{\sigma }{\pi {{\varepsilon }_{0}}b}(\hat{i}+\hat{j}+\hat{k})$

B) $\frac{\sigma }{2\pi {{\varepsilon }_{0}}b}(\hat{i}+\hat{j}+\hat{k})$

C) $\frac{\sigma }{\pi {{\varepsilon }_{0}}b}(\hat{i}+\hat{j}-\hat{k})$

D) $\frac{\sigma }{2\pi {{\varepsilon }_{0}}b}(\hat{i}+\hat{j}-\hat{k})$

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• question_answer50) A 2 m wide truck is moving with a uniform speed ${{v}_{0}}=8m{{s}^{-1}}$along a straight horizontal road. A pedestrain starts to cross the road with a uniform speed v, when the truck is 4 m away from him. The minimum value of v so that he can cross the road safely is

A) $2.62\,m{{s}^{-1}}$

B) $4.6\,m{{s}^{-1}}$

C) $0.89\,m{{s}^{-1}}$

D) $1.414\,m{{s}^{-1}}$

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• question_answer51) In the following reaction, product formed is A) B) C) D) View Answer play_arrow
• question_answer52) Which of the following compounds has same oxidation state of the central metal atom in the cationic and anionic part?

A) $[Pt{{(N{{H}_{3}})}_{4}}][PtC{{l}_{6}}]$

B) $[Pt(p{{y}_{4}})][PtC{{l}_{4}}]$

C) $[Pt(N{{H}_{3}})C{{l}_{2}}][PtC{{l}_{4}}]$

D) ${{K}_{4}}[Ni{{(CN)}_{6}}]$

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• question_answer53) Which of the following calcium salt will give cyclopentanone on heating?

A) Calcium succinate

B) Calcium adipate

C) Calcium glucarate

D) Calcium oxalate

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• question_answer54) In the reaction, $C{{H}_{3}}COOH\xrightarrow{LiAl{{H}_{4}}}A\xrightarrow{PC{{l}_{5}}}B\xrightarrow{Alc.KOH}C$the product is

A) acetaldehyde

B) acetylene

C) ethylene

D) acetylchloride

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• question_answer55) Complete hydrolysis of cellulose gives

A) D-fructose

B) D-ribose

C) D-glucose

D) L-glucose

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• question_answer56) Bakelite is obtained from phenol by reacting with

A) ${{(C{{H}_{2}}OH)}_{2}}$

B) $C{{H}_{3}}CHO$

C) $C{{H}_{3}}COC{{H}_{3}}$

D) $HCHO$

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• question_answer57) Phosgene can be obtained when

A) white phophorus reacts with alkali

B) calcium phosphide reacts with water

C) chloroform reacts with air

D) bone comes in contact with water

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• question_answer58) Select the coloured and paramagnetic ions

A) $C{{u}^{+}},Z{{n}^{2+}},C{{a}^{2+}}$

B) $S{{c}^{3+}},T{{i}^{4+}},{{V}^{5+}}$

C) $C{{u}^{2+}},C{{r}^{+}},M{{n}^{2+}}$

D) $N{{i}^{2+}},C{{u}^{+}},H{{g}^{2+}}$

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• question_answer59) Which of the following process is used in extractive metallurgy of magnesium?

A) Fused salt electrolysis

B) Self reduction

C) Aqueous solution electrolysis

D) Thermite reduction

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• question_answer60) Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

A) $SrS{{O}_{4}}$

B) $CaS{{O}_{4}}$

C) $~BeS{{O}_{4}}$

D) $~BaS{{O}_{4}}$

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• question_answer61) Which of the following statements is true?

A) ${{H}_{3}}P{{O}_{3}}$is stronger acid than ${{H}_{2}}S{{O}_{3}}$

B) In aqueous medium, HF is a stronger acid than HCI

C) $HCl{{O}_{4}}$is a weaker acid than $HCl{{O}_{3}}$

D) $HN{{O}_{3}}$ is a stronger acid than $HN{{O}_{2}}$

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• question_answer62) The orbital angular momentum of an electron is 2s orbital is

A) $+\,\,\frac{1}{2}.\frac{h}{2\pi }$

B) Zero

C) $\frac{h}{2\pi }$

D) $\sqrt{2}.\frac{h}{2\pi }$

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• question_answer63) The enthalpy change for a reaction does not depend upon the

A) physical state of reactants and products

B) use of different reactants for the same product

C) nature of intermediate reaction steps

D) difference in initial or final temperature of involved substances

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• question_answer64) The role of a catalyst is to change ......

A) Gibbs energy of reaction

B) enthalpy of reaction

C) activation energy of reaction

D) equilibrium constan

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• question_answer65) When ortho boric acid $({{H}_{3}}B{{O}_{3}})$ is heated, the residue is

A) boron

B) metaboric acid

C) boric anhydride

D) borax

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• question_answer66) 12 g of a non-volatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is

A) 80

B) 60

C) 20

D) 40

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• question_answer67) Electron gain enthalpy with/negative sign of fluorine is less than that of chlorine due to

A) high ionisation enthalpy of fluorine

B) smaller size of chlorine atom

C) smaller size of fluorine atom

D) bigger size of 2p orbital of fluorine

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• question_answer68) Fog is a colloidal solution of

A) liquid particles dispersed in a gas

B) gaseous particles dispersed in a liquid

C) solid particles dispersed in a liquid

D) solid particles dispersed in a gas

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• question_answer69) In the reaction sequence, (X) is

A) Cyclohexanone

B) Caprolactum

C) $HO{{(C{{H}_{2}})}_{6}}N{{H}_{2}}$

D) heaxmethylene diisocyanate

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• question_answer70) The highest calorific value is found in

A) proteins

B) fats

C) vitamins

D) carbohydrates

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• question_answer71) In an electric field, if an amino acid migrate towards cathode, the pH of solution is said to be

A) less than PI

B) More than PI

C) equal to PI

D) 7

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• question_answer72) Acid anhydrides on reaction with primary amines gives

A) amide

B) imide.

C) secondary amine

D) imine

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• question_answer73) Benzene diazonium chloride on reaction with phenol in weakly basic medium gives

A) diphenyl ether

B) p-hydroxyazobenzene

C) chlorobenzene

D) benzene

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• question_answer74) Reagent used for the oxidation of allyl alcohol to acrolein is

A) $KMn{{O}_{4}}$

B) ${{H}_{2}}{{O}_{2}}$

C) active $Mn{{O}_{2}}$

D) $Os{{O}_{4}}$

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• question_answer75) The enol form of acetone, after treatment with ${{D}_{2}}O$gives

A) $C{{H}_{3}}-\underset{OD}{\mathop{\underset{|}{\mathop{C}}\,}}\,=C{{H}_{2}}$

B) $C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}$

C) $C{{H}_{2}}=\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,-C{{H}_{2}}D$

D) $C{{D}_{2}}=\underset{OD}{\mathop{\underset{|}{\mathop{C}}\,}}\,-C{{D}_{3}}$

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• question_answer76) The compounds $[Co(S{{O}_{4}}){{(N{{H}_{3}})}_{5}}]Br$and $[Co(S{{O}_{4}}){{(N{{H}_{3}})}_{5}}]Cl$represent

A) linkage isomerism

B) ionisation isomerism

C) coordination isomerism

D) no isomerism

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• question_answer77) $\text{Xe}{{\text{F}}_{\text{2}}}$on hydrolysis gives

A) $Xe{{O}_{3}}$

B) $XeO$

C) $Xe$

D) $~Xe{{O}_{2}}$

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• question_answer78) Sulphur in +3 oxidation state is present in

A) dithionous acid

B) sulphurous acid

C) thionous acid

D) phyrosulphuric acid

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• question_answer79) Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with${{t}_{1/2}}=3.00h.$What fraction of sample of sucrose remains after 8 h?

A) 1.023M

B) 0.8725 M

C) 0.023 M

D) 0.1576 M

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• question_answer80) The osmotic pressure of a 5% (wt./vol) solution of cane sugar at$150{{\,}^{o}}C$is

A) $\text{ }\!\!~\!\!\text{ 3}\text{.078 atm}$

B) $\text{4}\text{.078 atm}$

C) $5.078\,\text{atm}$

D) $2.45\,\text{atm}$

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• question_answer81) An alloy of Cu, Ag, Au is found to have a simple cubic close packed lattice. If the Ag atoms occupy the face centres and Au is present at the body centre, the formula of the alloy will be

A) $C{{u}_{4}}A{{g}_{4}}Au$

B) $CuA{{g}_{3}}Au$

C) $cuAgCu$

D) $C{{u}_{4}}A{{g}_{2}}Au$

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• question_answer82) Ozone layer of stratosphere requires protection from indiscriminate use of

A) pesticides

B) atomic explosions

C) aerosols and high flying jets

D) balloons

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• question_answer83) An insaturated hydrocarbon A adds two molecules of ${{\text{H}}_{\text{2}}}$and on reductive ozonolysis gives butane-1, 4-dial, ethanol and propanone. Give the IUPAC name of A.

A) 3-methyl octa-2, 6-diene

B) 2-methyl octa-2, 5-diene

C) 2-methyl octa-2, 6-diene

D) 2-methyl octa-3, 5-diene

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• question_answer84) Carborundum is obtained when silica is heated at high temperature with

A) carbon

B) carbon monoxide

C) carbon dioxide

D) calcium carbonate

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• question_answer85) The difference of water molecules in gypsum and plaster of Paris is

A) $\frac{5}{2}$

B) 2

C) $\frac{1}{2}$

D) $1\frac{1}{2}$

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• question_answer86) Identify disproportionation reaction.

A) $C{{H}_{3}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}+2{{H}_{2}}O$

B) $C{{H}_{4}}+4C{{l}_{2}}\xrightarrow{{}}CC{{l}_{4}}+4HCl$

C) $2{{F}_{2}}+2O{{H}^{-}}\xrightarrow{{}}2{{F}^{-}}+O{{F}_{2}}+{{H}_{2}}O$

D) $2N{{O}_{2}}+2O{{H}^{-}}\xrightarrow{{}}NO_{2}^{-}+NO_{3}^{-}+{{H}_{2}}O$

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• question_answer87) The solubility product of $\text{A}{{\text{g}}_{\text{2}}}\text{Cr}{{\text{O}}_{\text{4}}}$is $32\times {{10}^{-12}}.$What is the concentration of $CrO_{4}^{-}$ions in that solution?

A) $2\times {{10}^{-4}}M$

B) $16\times {{10}^{-4}}M$

C) $8\times {{10}^{-4}}M$

D) $8\times {{10}^{-8}}M$

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• question_answer88) The structure of $\text{I}{{\text{F}}_{\text{5}}}$can be described as

A) B) C) D) None of these

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• question_answer89) $\text{pH}$of $\text{1}{{\text{0}}^{-8}}\text{N}\,\text{NaOH}$is

A) 8.0

B) 6.0

C) 6.98

D) 7.04

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• question_answer90) The heat of neutralisation of a strong acid and a strong alkali is $57.0\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}.$ The heat released when 0.5 mole of $\text{HN}{{\text{O}}_{\text{3}}}$solution is mixed with 0.2 mole of KOH is

A) 57.0 kJ

B) 11.4 kJ

C) 28.5kJ

D) 34.9kJ

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• question_answer91) The unit and value of rate constant and that of rate of reaction are same for

A) zero order

B) first order

C) second order

D) third order

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• question_answer92) A weak acid HA after treatment with 1.2 mL of 0.1 M strong base has a pH of 5. At the end point, the volume of same base required is 26.6 mL. The value of ${{\text{K}}_{\text{a}}}$ is

A) $8.2\times {{10}^{-6}}$

B) $6.4\times {{10}^{-6}}$

C) $5.3\,\times {{10}^{-5}}$

D) $2.4\times {{10}^{-6}}$

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• question_answer93) A and B are respectively.

A) ${{H}_{2}}/Pt;LiAl{{H}_{4}}/{{H}_{2}}O$

B) ${{H}_{2}}/Pt;{{H}_{2}}/Pt$

C) $LiAl{{H}_{4}}/{{H}_{2}}O;LiAl{{H}_{4}}/{{H}_{2}}O$

D) $LiAl{{H}_{4}}/{{H}_{2}}O;{{H}_{2}}/Pt$

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• question_answer94) The $\text{IUPAC}$name of A) 3, 4-dimethylpentanoyl chloride

B) 1-chloro-1-oxo-2, 3-dimethylpentane

C) 2-ethyl-3-methylbutanoyl chloride

D) 2, 3-dimethylpentanoyl chloride

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• question_answer95) $\text{F}{{\text{e}}^{\text{2+}}}$reduces $\text{N}{{\text{H}}_{\text{4}}}\text{OH}$ to

A) $N{{H}_{3}}$

B) ${{N}_{3}}H$

C) ${{N}_{2}}{{H}_{4}}$

D) ${{N}_{2}}$

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• question_answer96) Proteins when heated with conc. $\text{HN}{{\text{O}}_{\text{3}}}$give yellow colour. This is known as

A) Hoppes test

B) acid-base test

C) Biurets test

D) Xanthoprotic test

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• question_answer97) A person was using water supplied by municipality. Due to shortage of water, he started using underground water. He felt laxative effect. Its cause due to high concentration of

A) $C{{O}_{2}}$

B) $SO_{4}^{2-}$

C) $CO_{3}^{2-}$

D) ${{S}^{2-}}$

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• question_answer98) The order of acidic strength of boron dihalides is

A) $B{{F}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}<B{{l}_{3}}$

B) $B{{l}_{3}}<BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}$

C) $BC{{l}_{3}}<BB{{r}_{3}}<B{{l}_{3}}<B{{F}_{3}}$

D) $BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}<B{{l}_{3}}$

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• question_answer99) The hardest substance amongst the following is

A) $~B{{e}_{2}}C$

B) tritonium

C) ${{B}_{4}}C$

D) graphite

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• question_answer100) The radius of divalent cation ${{\text{M}}^{\text{2+}}}$ is 94 pm and that of divalent anion ${{\text{X}}^{2-}}$is 146 pm. Thus ${{M}^{2+}}{{X}^{2-}}$ has

A) $\text{NaCl}$structure

B) linear structure

C) $\text{CsCl}$structure

D) $\text{ZnS}$structure

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• question_answer101) Bt cotton has been made resistant from corn borer disease by the introduction of the gene

A) cry $\text{ }\!\!|\!\!\text{ Ac}$

B) cry $\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ Ab}$

C) cryl$\text{ }\!\!|\!\!\text{ Ab}$

D) $\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ Ac}$

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• question_answer102) Which of the following is not the characteristic of a stable community?

A) Productivity should vary too much from year to year

B) It should be resistant to occasional natural and man-made disturbances

C) It should be resistant to invasions by alien species

D) Productivity should not vary too much from year to year

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• question_answer103) Three mile Island and chemobyl disasters associated with accidental leakage of radioactive wastes. In India we had Bhopal gas tragedy. It is associated with which of the following?

A) $\text{C}{{\text{O}}_{2}}$

B) Methyl isocyanate

C) $\text{ }\!\!~\!\!\text{ CFCs}$

D) Methyl cyante

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• question_answer104) Mark the pair of substances among the following, which is essential for coagulation of blood?

A) Heparin and calcium ions

B) Calcium ions and platelet factors

C) Oxilates and citrates

D) Platelet factors and heparin

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• question_answer105) Select an incorrect statement regarding capitulum inflorescence of sunflower.

A) Disc florets are actipomorphic.

B) Main axis becomes a flat receptacle.

C) Receptacle bears many sessile and small florets.

D) Ray florets are actinomorphic.

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• question_answer106) The genotype of B-group father of an O-group child would

A) ${{\text{ }\!\!|\!\!\text{ }}^{\text{A}}}\text{i}$

B) ${{\text{ }\!\!|\!\!\text{ }}^{\text{B}}}\text{i}$

C) ${{\text{l}}^{\text{B}}}{{\text{l}}^{\text{B}}}$

D) ${{O}_{i}}$

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• question_answer107) Which of the following is a major difference in replication in prokaryotes and eukaryotes?

A) Replication in prokaryotes is conservative while it is semiconservative in eukaryotes

B) Prokaryotes do not require small RNA primer for initiation of replication as in eukaryotes

C) Prokaryotes have single origin of replication and eukaryoteshave multiple origin of replication

D) All of the above

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• question_answer108) The process of mineralisation by microorganisms helps in the release of

A) inorganic nutrients from humus

B) both organic and inorganic nutrients from detritus

C) organic nutrients from humus

D) inorganic nutrients from detritus and formation of Humus

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• question_answer109) In a population, when the growth rate reaches to its maximum it is called

A) earring capasity

B) biotic potential

C) positive interactions

D) negative growth

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• question_answer110) Which of the given statement is correct in the context of observing DNA separation by agarose gel electrophoresis?

A) DNA can be seen in visible light.

B) DNA can be seen without staining in visible light.

C) Ethidium bromide stained DNA can be seen in visible light.

D) Ethidium bromide stained DNA can be seen under exposure to UV light.

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• question_answer111) The first acceptor of electrons from an excited chlorophyll molecule of photosystem-II is

A) cytochrome

B) iron-sulphur protein

C) ferredoxin

D) plastoquinone

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• question_answer112) Which of the following is inhibitory neurotransmitter?

A) GABA

B) 5-hydroxy tryptophan

C) Serotonin

D) Glutamine

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• question_answer113) Which of the following hormone is responsible for regulation of calcium levels in our blood?

A) ACTH

B) Oxytocin

C) MSH

D) Thyrocalcitonin

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• question_answer114) Law of dominance explained by Mendel has its basis on which type of cross?

A) Monohybrid cross

B) Dihybrid cross

C) Reciprocal cross

D) None of these

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• question_answer115) What is antisense technology?

A) A cell displaying a foreign antigen used for synthesis of antigens

B) Production of somaclonal variants in tissue culture

C) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene

D) RNA polymerase producing DNA

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• question_answer116) Which of the following is not a rhizome?

A) Nelumbium (lotus)

B) Curcuma (turmeric)

C) Crocus (kesar)

D) Zingiber (ginger)

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• question_answer117) The modified equation for water potential is

A) ${{\psi }_{w}}={{\psi }_{s}}+{{\psi }_{\rho }}$

B) ${{\psi }_{w}}={{\psi }_{s}}-{{\psi }_{\rho }}$

C) ${{\psi }_{w}}={{\psi }_{s}}$

D) ${{\psi }_{w}}={{\psi }_{\rho }}-{{\psi }_{s}}$

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• question_answer118) The synthetic hormone used as a weedicide is

A) indole 3-acetic acid

B) gibberellic acid

C) 2, 4-dichlorophenoxyacetic acid

D) malic hydrazide

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• question_answer119) Seedless fruits can be made by treating the unpollinated ovaries with

A) auxines

B) colchicine

C) sucrose solution

D) pure lanolin

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• question_answer120) In yeast, the sexual reproduction is by conjugation. After fusion, the zygotic nucleous divides meiotically and forms haploid spores. The unicellular structure with haploid spores is

A) sporangium

B) gametangium

C) ascus

D) zoosporangium

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• question_answer121) Which of the following is not true for hormones?

A) They are not available again after the process is over

B) Hormones are directly poured into blood

C) They induce or inhibit bio-chemical processes

D) Each and every hormone of human is always chemically protein

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• question_answer122) What is true about neurohypophysis?

A) Stores hormones produced byadenohypophysis

B) Functionless in humans

C) Stores and releases neurohormones secreted by hypothalamus

D) Secretes its own hormone

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• question_answer123) Which of the following is an exclusive character in mammals?

 (i) Muscular diaphragm is present in mammals. (ii) Homeothermy is exclusively present in mammals. (iii) Heart is four-chambered with two auricles and two ventricles. (iv) Mammals can be both oviparous and viviparous

A) Only I

B) Only IV

C) II and III

D) Only III

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• question_answer124) Which one of the following is a matching set of phylum and its three examples?

A) Cnidari-Bonellia, Physalia and Aurelia

B) Platyhelminthes-Planaira, Enterobius and Schistosoma

C) Mollusca-Loligo, Teredo and Octopus

D) Porifera-Spongilla, Euplectella and Pennatula

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• question_answer125) Arrange the following events of the replication of DNA.

 (i) Bonds between complementary bases breaks. (ii) Bonds between complementary bases forms. (iii) DNA molecules uncoils. (iv) Opposite strands separates. (v) Sugar phosphate bonds forms. (VI) Free nucleotides align with the complementary nucleotides on each strand.
Choose the correct alternative

A) $VI\to I\to III\to IV\to V\to II$

B) $III\to VI\to IV\to V\to II$

C) $I\to III\to VI\to IV\to II\to V$

D) $III\to I\to IV\to VI\to II\to V$

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• question_answer126) A haemophilic woman marries a normal man, then

A) all the children will be normal

B) all the sons will be haemophilic

C) all the girls will be haemophilic

D) half girls will be haemophilic

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• question_answer127) Vascular bundles in monocotyledons are considerd closed because

A) xylem is surrounded all around by phloem

B) there are no vessels with perforations

C) a bundle sheath surrounds each bundle

D) there is no secondary growth

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• question_answer128) In Mirabilis, a hybrid for red (RR) and white (rr) flower produces pink (Rr) flower. A plant with pink flower is crossed with white flower, the expected phenotypic ratio is

A) red: pink; white (1 : 2 :1)

B) pink: white (1 :1)

C) red: pink (1 : 1)

D) red: white (3:1)

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• question_answer129) Variable Number of Tandem Repeats (VNTRs) in the DNA molecule are highly useful in

A) recombinant DNA technology

B) DNA fingerprinting

C) monoclonal antibody production

D) stem cell culture

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• question_answer130) Male gametes of Cycas are

A) small, biciliate and circular

B) small, uniciliate and circular

C) large, biciliate and reniform

D) large, multiciliated and top-shaped

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• question_answer131) Sexual reproduction in Spirogyra is on advanced feature because it shows

A) morphologically differentiated sex organs

B) physiologically differentiated sex organs

C) different sizes of motile sex organs

D) same size of motile sex organs

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• question_answer132) Which of the following statements is correct?

A) Glucose acts as inducer for/ac operon.

B) Galactose acts as inducer for lac operon.

C) Glucose or galactose act as inducers for lac operon.

D) Glucose or galactose cannot act as inducer for lac operon.

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• question_answer133) The segment of DNA that codes for a polypeptide is called

A) recon

B) cistron

C) intron

D) muton

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• question_answer134) Which of the following is formed from phosphorylation?

A) Fructose 1, 6-biphosphate

B) Phosphdglyceric acid

C) PEP

D) Pyruvic acid

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• question_answer135) Which one of the following pairs of geographical areas shows maximum biodiversity in our country?

A) Western Ghats and North-East region

B) Deccan peninsula and Sundarbans

C) Semi-arid zone and North-East region

D) Andman and Nicobar islands

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• question_answer136) Heroin is

A) sedative and euphoriant

B) white and analgesic (pain killers)

C) a bitteralkaloid

D) white, odourless, bitter crystalline compound

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• question_answer137) Which one of the following is being tried in India as a bio fuel substitute for fossil fuels?

A) Jatropha

B) Azadirachta

C) Musa

D) Aegilops

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• question_answer138) Which one of the following option is right?

A) Left auricle, oxygenated blood, high pH

B) Lett auricle, deoxygenated blood, low pH

C) Right auricle, deoxygenated blood, low pH

D) Right auricle, oxygenated blood, high pH

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• question_answer139) Match the following columns.

 Column I Column II A. Darwin B. Alfred Wallace C. HugodeVries D. Lamarck 1. Evening primrose 2. MMS Beagle 3. Long necked giraffe 4. Archepelago

A) A-2 B-4 C-1 D-3

B) A-2 B-1 C-4 D-3

C) A-4 B-1 C-2 D-3

D) A-3 B-2 C-1 D-4

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• question_answer140) Modern representative of an ancient link between the echinoderms and the chordates is represented by

A) Hemichordata

B) Urochordata

C) Cephalochordata

D) Vertebrates

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• question_answer141) Assertion [A] Power of locomotion is poor in Ascans. Reason [R] The body wall of Ascaris has cuticle, but lacks circular muscles.

A) Both A and R true and R is the correct explanation of A.

B) Both A and R true, but R is not the correct explanation of A.

C) A is true, R is false.

D) Both A and R are false.

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• question_answer142) Identify the correctly matched pair.

A) Gir forest - Rhino

B) Kaziranga - Elephant

C) Corbettpark - Aves

D) RannofKutch - Wild ass

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• question_answer143) Random genetic drift in a population leads to

A) highly genetically variable individuals

B) increased inbreeding within a population

C) constant low mutation rate

D) large population size

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• question_answer144) Select the false statement.

A) Ribosomes and centriole are non-membrane bound organalles of a cell.

B) Ribosomes are enveloped by a double membrane.

C) Plasmadesmeta are the cytoplasmic connections between cells.

D) Cell membrane is semi-permeable or selectively permeable.

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• question_answer145) Single Cell Protein (SCP) is

A) protein obtained from a clone of cells

B) protein obtained from unicellular organisms

C) biomass obtained from microorganisms

D) proteins obtained from biomass of microorganisms

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• question_answer146) Identify the wrongly matched pair.

A) Typhoid - Widal test

B) Plague - Viral disease

C) Malignant - Plasmodium malaria falciparum

D) Common - Rhinovirus cold

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• question_answer147) The system of classification proposed by Linnaeus are artificial because

A) It considered physiological characters along with morphology

B) It considered evolutionary relationships of plants

C) It takes into account similarities and differences in few uniflying characters

D) None of the above

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• question_answer148) Haemolymph of cockroach contains

A) erythrocytes and plasma

B) respiratory pigments only

C) haemocytes, leucocytes and plasma

D) haemocytes and plasma

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• question_answer149) Hyperosmotic urine secretion depends upon the

A) width of Bowmans capsule

B) length of loop of Henie

C) length of proscimal convoluted tubules

D) length of distle convoluted tubule

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• question_answer150) TMV and majority of plant viruses possess

A) Only ssRNA

B) Only dsRNA

C) Both RNA and DNA

D) Only DNA

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