question_answer1) The twinkling effect of star light is due to:
A) total internal reflection
B) high dense matter of star
C) constant burning of hydrogen in the star
D) the fluctuating apparent position of the star being slightly different from the actual position of the star
View Answer play_arrowquestion_answer2) The width of the diffraction band varies:
A) inversely as the wavelength
B) directly as the width of the slit
C) directly as the distance between the slit and the screen
D) inversely as the size of the source from which the slit is illuminated
View Answer play_arrowquestion_answer3) An unpolarised beam of intensity \[{{I}_{0}}\] is incident on a pair of nicols making an angle of \[{{60}^{o}}\] with each other. The intensity of light emerging from the pair is:
A) \[{{I}_{0}}\]
B) \[{{I}_{0}}/2\]
C) \[{{I}_{0}}/4\]
D) \[{{I}_{0}}/8\]
View Answer play_arrowquestion_answer4) Look at the graphs (a) to (d) carefully and indicate which of these possibly represents one dimensional motion of a particle?
A)
B)
C)
D)
View Answer play_arrowquestion_answer5) A cyclist starts from the centre 0 of a circular park of radius 1 km, reaches the edge P of the park, then cycles along the circumference and returns to the centre along O as shown in the figure. If the round trip takes 10 min, the net displacement and average speed of the cyclist (in meters and kilometre per hour) are:
A) \[0,1\]
B) \[\frac{\pi +4}{2},0\]
C) \[21.4,\frac{\pi +4}{2}\]
D) \[0,21.4\]
View Answer play_arrowquestion_answer6) When a low flying aircraft passes over head, we sometimes notice a slight shaking of the picture on our TV screen. This is due to:
A) diffraction of the signal received from the antenna
B) interference of the direct signal received by the antenna with the weak signal reflected by the passing Aircraft
C) change of mageneric flux occuring due to the passage of aircraft
D) vibration created by the passage of aircraft
View Answer play_arrowquestion_answer7) A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is:
A) 1.2 cm
B) 1.2 mm
C) 2.4 cm
D) 2.4 mm
View Answer play_arrowquestion_answer8) The physical quantity having the dimensions \[[{{M}^{-1}}{{L}^{-3}}{{T}^{3}}{{A}^{2}}]\]is:
A) resistance
B) resistivity
C) electrical conductivity
D) electromotive force
View Answer play_arrowquestion_answer9) A battery of emf 10 V and internal resistance \[3\,\Omega \] is connected to a resistor. The current in the circuit is 0.5 A. The terminal voltage of the battery when the circuit is closed is:
A) 10 V
B) 0 V
C) 1.5 V
D) 8.5 V
View Answer play_arrowquestion_answer10) A galvanometer coil has a resistance of 15 \[\Omega \] and gives full scale deflection for a current of 4 mA. To convert it to an ammeter of range 0 to 6 A:
A) \[10\,m\,\,\Omega \] resistance is to be connected in parallel to the galvanometer
B) \[10\,m\,\,\Omega \] resistance is to be connected in series with the galvanometer
C) \[0.1\,\,\,\Omega \] resistance is to be connected in parallel to the galvanometer
D) \[0.1\,\,\,\Omega \] resistance is to be connected in series with the galvanometer
View Answer play_arrowquestion_answer11) The electron dirft speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. This is due to:
A) the conducting property of the conductor
B) the resistance of the conductor is small
C) the electron number density of the conductor is small
D) the electron number density of the conductor is enormous
View Answer play_arrowquestion_answer12) A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid air by a uniform horizontal magnetic field B. The magnitude of B (in tesia) is: (assume \[g=9.8\text{ }m{{s}^{-2}}\])
A) 2
B) 1.5
C) 0.55
D) 0.65
View Answer play_arrowquestion_answer13) In the circuit shown the value of \[I\] in ampere is:
A) 1
B) 0.60
C) 0.4
D) 1.5
View Answer play_arrowquestion_answer14) A Gaussian sphere encloses an electric dipole within it. The total flux across the sphere is:
A) zero
B) half that due to a single charge
C) double that due to a single charge
D) dependent on the position of the dipole
View Answer play_arrowquestion_answer15) A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be?
A) 400 %
B) 66.6 %
C) 33.3 %
D) 200 %
View Answer play_arrowquestion_answer16) A comb run through ones dry hair attracts small bits of paper. This is due to:
A) comb is a good conductor
B) paper is a good conductor
C) the atoms in the paper get polarised by the charged comb
D) the comb possesses magnetic properties
View Answer play_arrowquestion_answer17) The top of the atmosphere is about 400 kv with respect to the surface of the earth corresponding to an electric field that decreases with altitude. Near the surface the earth, the field is about \[100\,\,V{{m}^{-1}}\] do not get an electric shock as we step out of our house into the open house because (assume the house to be a steel cage so that there is no field inside)
A) there is a potential difference between our body and the ground
B) \[100\,\,V{{m}^{-1}}\] is not a high electric field so that we do not feel the shock
C) our body and the ground forms a equipotential surface
D) the dry atmosphere is not a conductor
View Answer play_arrowquestion_answer18) The specific charge of a proton is\[9.6\times {{10}^{7}}Ck{{g}^{-1}}\]. The specific charge of alpha particle will be:
A) \[9.6\times {{10}^{7}}C\text{ }k{{g}^{-1}}\]
B) \[19.2\times {{10}^{7}}C\text{ }k{{g}^{-1}}\]
C) \[4.8\times {{10}^{7}}C\text{ }k{{g}^{-1}}\]
D) \[2.4\times {{10}^{7}}C\text{ }k{{g}^{-1}}\]
View Answer play_arrowquestion_answer19) When light of wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 600 nm is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is:
A) \[1:2\]
B) \[2:1\]
C) \[4:1\]
D) \[1:4\]
View Answer play_arrowquestion_answer20) White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is:
A) band emission spectrum
B) line emission spectrum
C) band absorption spectrum
D) line absorption spectrum
View Answer play_arrowquestion_answer21) If \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] are the wavelengths of the first members of the Lyman and Paschen series respectively, then \[{{\lambda }_{1}}:{{\lambda }_{2}}\] is:
A) \[1:3\]
B) \[1:30\]
C) \[7:50\]
D) \[7:108\]
View Answer play_arrowquestion_answer22) Activity of a radioactive sample decreases to \[{{(1/3)}^{rd}}\] of its original value in 3 days. Then, in 9 days its activity will become:
A) (1/27) of the original value
B) (1/9) of the original value
C) (1/18) of the original value
D) (1/3) of the original value
View Answer play_arrowquestion_answer23) Identify the operation performed by the circuit given below:
A) NOT
B) AND
C) OR
D) NAND
View Answer play_arrowquestion_answer24) The working of which of the following is similar to that of a slide projector?
A) Electron microscope
B) Scanning electron microscope
C) Transmission electron microscope
D) Atomic force microscope
View Answer play_arrowquestion_answer25) In a transistor the collector current is always less than the emitter current because:
A) collector side is reverse biased and the emitter side is forward biased
B) a few electrons are lost in the base and only remaining ones reach the collector
C) collector being reverse biased, attracts less electrons
D) collector side is forward biased and emitter side is reverse biased
View Answer play_arrowquestion_answer26) A transparent cube of 0.21 m edge contains a small air bubble. Its apparent distance when viewed through one face of the cube is 0.10 m and when viewed from the opposite face is 0.04 m. The actual distance of the bubble from the second face of the cube is:
A) 0.06 m
B) 0.17 m
C) 0.05 m
D) 0.04 m
View Answer play_arrowquestion_answer27) White light is incident on one of the refracting surfaces of a prism of angle \[{{5}^{o}}\]. If the refractring indices for red and blue colours are 1.641 and 1.659 respectively, the angular separation between these two colours when they emerge out of the prism is:
A) \[{{0.9}^{o}}\]
B) \[{{0.9}^{o}}\]
C) \[{{1.8}^{o}}\]
D) \[{{1.2}^{o}}\]
View Answer play_arrowquestion_answer28) For a given lens, the magnification was found to be twice as large as when the object was 0.15 m distant from it as when the distance was 0.2 m. The focal length of the lens is:
A) 1.5 m
B) 0.20 m
C) 0.10 m
D) 0.05 m
View Answer play_arrowquestion_answer29) To a fish under water, viewing obliquely a fisherman standing on the bank of a lake, the man looks:
A) taller than what he actually is
B) shorter that what he actually is
C) the same height as he actually is
D) depends on the obliquity
View Answer play_arrowquestion_answer30) A thin prism \[{{P}_{1}}\] with angle \[{{4}^{o}}\] made from a glass of refractive index 1.54 is combined with another thin prism \[{{P}_{2}}\] made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism \[{{P}_{2}}\]is:
A) \[{{5.33}^{o}}\]
B) \[{{4}^{o}}\]
C) \[{{3}^{o}}\]
D) \[{{2.6}^{o}}\]
View Answer play_arrowquestion_answer31) If white light is used in the Newtons rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to:
A) \[{{90}^{o}}\] change of phase in one of the reflected waves
B) \[{{180}^{o}}\] change of phase in one of the reflected waves
C) \[{{145}^{o}}\] change of phase in one of the reflected waves
D) \[{{45}^{o}}\] change of phase in one the reflected waves
View Answer play_arrowquestion_answer32) Specific rotation of sugar solution is \[0.5\text{ }deg\text{ }{{m}^{2}}/kg.\text{ }200\text{ }kg{{m}^{-3}}\] of impure sugar solution is taken in a sample polarimeter tube of length 20 cm and optical rotation is found to be \[{{19}^{o}}\]. The percentage of purity of sugar is:
A) 20 %
B) 80 %
C) 95 %
D) 89 %
View Answer play_arrowquestion_answer33) A simple pendulum has a length \[l\] and the mass of the bob is m. The bob is given a charge q coulomb. The pendulum is suspended between the vertical plates of a charged parallel plate capacitor. If E is the electric field strength between the plates, the time period of the pendulum is given by:
A) \[2\pi \sqrt{\frac{l}{g}}\]
B) \[2\pi \sqrt{\frac{l}{\sqrt{g+\frac{qE}{m}}}}\]
C) \[2\pi \sqrt{\frac{l}{\sqrt{g-\frac{qE}{m}}}}\]
D) \[2\pi \sqrt{\frac{l}{\sqrt{{{g}^{2}}+{{\left( \frac{qE}{m} \right)}^{2}}}}}\]
View Answer play_arrowquestion_answer34) A gang capacitor is formed by interlocking a number of plates as, shown in figure. The distance between the consecutive plates is 0.885 cm and the overlapping area of the plates is \[5\text{ }c{{m}^{2}}\]. The capacity of the unit is:
A) 1.06 pF
B) 4 pF
C) 6.36 pF
D) 12.72 pF
View Answer play_arrowquestion_answer35) A satellite in a circular orbit of radius R has a period of 4 h. Another satellite with orbital radius 3 R around the same planet will have a period (in hours):
A) 16
B) 4
C) \[4\sqrt{27}\]
D) \[4\sqrt{8}\]
View Answer play_arrowquestion_answer36) The freezer in a refrigerator is located at the top section so that:
A) the entire chamber of the refrigerator is cooled quickly due to convection
B) the motor is not heated
C) the heat gained from the environment is high
D) the heat gained from the environment is low
View Answer play_arrowquestion_answer37) The unit of Stefans constant is:
A) \[W{{m}^{-2}}{{K}^{-1}}\]
B) \[Wm\,{{K}^{-4}}\]
C) \[W{{m}^{-2}}{{K}^{-4}}\]
D) \[N{{m}^{-2}}{{K}^{-4}}\]
View Answer play_arrowquestion_answer38) A monoatomic gas is suddenly compressed to \[{{(1/8)}^{th}}\] of its initial volume adiabatically The ratio of its final pressure to the initial pressure is: (Given the ratio of the specific heats of the given gas to be 5/3)
A) 32
B) 40/3
C) 24/5
D) 8
View Answer play_arrowquestion_answer39) A Carnot engine takes heat from a reservoir at \[{{627}^{o}}C\] and rejects heat to a sink at \[{{27}^{o}}C\]. Its efficiency will be:
A) 3/5
B) 1/3
C) 2/3
D) 200/209
View Answer play_arrowquestion_answer40) A 30 V, 90 W lamp is to be operated on a 120 V DC line. For proper glow, a resistor of ...... \[\Omega \] should be connected in series with the lamp.
A) 40
B) 10
C) 20
D) 30
View Answer play_arrowquestion_answer41) A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminals of the battery are short-circuited. A graph of current \[(I)\] in the circuit versus the number of cells will be as shown in figure:
A)
B)
C)
D)
View Answer play_arrowquestion_answer42) A tuning fork A produces 4 beats/s with another tuning fork B of frequency 320 Hz. On filing one of the prongs of A, 4 beats/s are again heard when sounded with the same fork B. Then, the frequency of the fork A before filing is:
A) 328 Hz
B) 316 Hz
C) 324 Hz
D) 320 Hz
View Answer play_arrowquestion_answer43) When the length of the vibrating segment of a sonometer wire is increased by 1%, the percentage change in its frequency is:
A) \[\frac{100}{101}\]
B) \[\frac{99}{100}\]
C) 1
D) 2
View Answer play_arrowquestion_answer44) The sprinkling of water reduces slightly the temperature of a closed room because:
A) temperature of water is less than that of the room
B) specific heat of water is high
C) water has large latent heat of vaporization
D) water is a bad conductor of heat
View Answer play_arrowquestion_answer45) The equation of a simple harmonic wave is given by \[y=5\sin \frac{\pi }{2}\left( 100t-x \right)\] where \[x\]- and y are in metre and time is in second. The period of the wave in second will be:
A) 0.04
B) 0.01
C) 1
D) 5
View Answer play_arrowquestion_answer46) The loudness and pitch of a sound note depends on:
A) intensity and frequency
B) frequency and number of harmonics
C) intensity and velocity
D) frequency and velocity
View Answer play_arrowquestion_answer47) For ordinary terrestrial experiments, the observer in an inertial frame in the following cases is:
A) a child revolving in a giant wheel
B) a driver in a sports car moving with a constant high speed of \[200\text{ }km{{h}^{-1}}\] on a straight rod
C) the pilot of an aeroplane which is taking off
D) a cyclist negotiating a sharp curve
View Answer play_arrowquestion_answer48) A rectangular vessel when full of water, takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water?
A) 9 min
B) 7 min
C) 5 min
D) 3 min
View Answer play_arrowquestion_answer49) If there were no gravity, which of the following will not be there for a fluid?
A) Viscosity
B) Surface tension
C) Pressure
D) Archimedes upward thrust
View Answer play_arrowquestion_answer50) In a LCR series circuit, the potential difference between the terminals of the inductance is 60 V between the terminals of the capacitor is 30 V and that across the resistance is 40 V Then, supply voltage will be equal to:
A) 50 V
B) 70 V
C) 130 V
D) 10 V
View Answer play_arrowquestion_answer51) When deuterium and helium are subjected to an accelerating field simultaneously then:
A) both acquire same energy
B) deuterium accelerates faster
C) helium accelerates faster
D) neither of them is accelerated
View Answer play_arrowquestion_answer52) A solenoid 1.5m long and 0.4 cm in diameter possesses 10 turns per cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is:
A) \[2\pi \times {{10}^{-3}}T\]
B) \[2\pi \times {{10}^{-5}}T\]
C) \[4\pi \times {{10}^{-2}}T\]
D) \[4\pi \times {{10}^{-3}}T\]
View Answer play_arrowquestion_answer53) A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of \[PQ=QR=l.\text{ }A\] current \[I\]ampere flows through the wire as shown. The magnitude of the force on PQ and Q.R will be:
A) \[BIl,0\]
B) \[2BIl,0\]
C) \[0,BIl\]
D) 0,0
View Answer play_arrowquestion_answer54) A choke is preferred to a resistance for limiting current in AC circuit because:
A) choke is cheap
B) there is no wastage of power
C) choke is compact in size
D) choke is a good absorber of heat
View Answer play_arrowquestion_answer55) A current of 6 A enters one comer P of an equilateral triangle PQR having 3 wires of resistances \[2\Omega \] each and leaves by the comer R. Then the current \[{{I}_{1}}\] and \[{{I}_{2}}\] are:
A) 2 A, 4 A
B) 4 A, 2 A
C) 1 A, 2 A
D) 2 A, 3 A
View Answer play_arrowquestion_answer56) To a germanium crystal equal number of aluminium and indium atoms are added. Then:
A) it remains an intrinsic semiconductor
B) it becomes a n-type semiconductor
C) it becomes a p-type semiconductor
D) it becomes an insulator
View Answer play_arrowquestion_answer57) Maxium velocity of the photoelectrons emitted by a metal surface is \[1.2\times {{10}^{6}}m{{s}^{-1}}\]. Assuming the specific charge of the electron to be \[1.8\times {{10}^{11}}C\text{ }k{{g}^{-1}}\], the value of the stopping potential in volt will be:
A) 2
B) 3
C) 4
D) 6
View Answer play_arrowquestion_answer58) Which of the following figures represents the variation of particle momentum and associated de-Broglie wavelength?
A)
B)
C)
D)
View Answer play_arrowquestion_answer59) The term liquid crystal refers to a state that is intermediate between:
A) crystalline solid and amorphous liquid
B) crystalline solid and vapour
C) amorphous liquid and its vapour
D) a crystal immersed in a liquid
View Answer play_arrowquestion_answer60) If \[{{r}_{1}}\] and \[{{r}_{2}}\] are the radii of the atomic nuclei of mass numbers 64 and 125 respectively, then the ratio \[({{r}_{1}}/{{r}_{2}})\] is:
A) \[\frac{64}{125}\]
B) \[\sqrt{\frac{64}{125}}\]
C) \[\frac{5}{4}\]
D) \[\frac{4}{5}\]
View Answer play_arrowquestion_answer61) Which of the following is not an ore of magnesium?
A) Carnal lite
B) Dolomite
C) Calamine
D) Sea water
View Answer play_arrowquestion_answer62) The atomic number of Ni and Cu are 28 and 29 respectively. The electronic configuration. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\] represents :
A) \[C{{u}^{+}}\]
B) \[C{{u}^{2+}}\]
C) \[N{{i}^{2+}}\]
D) Ni
View Answer play_arrowquestion_answer63) In the following, the element with the highest ionisation energy is :
A) \[[Ne]\,3{{s}^{2}}3{{p}^{1}}\]
B) \[[Ne]\,3{{s}^{2}}3{{p}^{3}}\]
C) \[[Ne]\,3{{s}^{2}}3{{p}^{2}}\]
D) \[[Ne]\,3{{s}^{2}}3{{p}^{4}}\]
View Answer play_arrowquestion_answer64) In the conversion of \[B{{r}_{2}}\] to \[BrO_{3}^{-}\], the oxidation number of Br changes from :
A) zero to 4 - 5
B) +1 to +5
C) zero to -3
D) +2 to +5
View Answer play_arrowquestion_answer65) Among the alkali metals cesium is the most reactive because :
A) its incomplete shell is nearest to the nucleus
B) it has a single electron in the valence shell
C) it is the heaviest alkali metal
D) the outermost electron is more loosely bound than the outermost electron of the other alkali metals
View Answer play_arrowquestion_answer66) Which of the following represents the Lewis structure of \[{{N}_{3}}\] molecule?
A) \[_{\times }^{\times }N\equiv N_{\times }^{\times }\]
B) \[_{\times }^{\times }\overset{\times \,\,\,\times }{\mathop{N}}\,\equiv \overset{\times \,\,\,\times }{\mathop{N_{\times }^{\times }}}\,\]
C) \[_{\times }^{\times }\overset{\times \,\,\,\times }{\mathop{N_{\times }^{\times }}}\,\equiv \overset{\times \,\,\,\times }{\mathop{\underset{\times }{\mathop{N}}\,_{\times }^{\times }}}\,\]
D) \[_{\times }^{\times }\overset{\times \,\,\,\times }{\mathop{\underset{\times \,\,\,\times }{\mathop{N}}\,_{\times }^{\times }}}\,=\overset{\times \,\,\,\times }{\mathop{\underset{\times \,\,\,\times }{\mathop{N}}\,_{\times }^{\times }}}\,\]
View Answer play_arrowquestion_answer67) Hydrogen bond is strongest in :
A) S-H...O
B) O-H...S
C) F-H...F
D) O-H...N
View Answer play_arrowquestion_answer68) The decomposition of a certain mass of \[CaC{{O}_{3}}\] gave \[11.2\text{ }d{{m}^{3}}\] of \[C{{O}_{2}}\] gas at STR The mass of KOH required to completely neutralise the gas is :
A) 56 g
B) 28 g
C) 42 g
D) 20 g
View Answer play_arrowquestion_answer69) The density of a gas is 1.964 g \[d{{m}^{-3}}\] at 273 K and 76 cm Hg. The gas is:
A) \[C{{H}_{4}}\]
B) \[{{C}_{2}}{{H}_{6}}\]
C) \[C{{O}_{2}}\]
D) \[Xe\]
View Answer play_arrowquestion_answer70) 0.06 mole of \[KN{{O}_{3}}\] solid is added to \[100\,c{{m}^{3}}\]of water at 298K. The enthalpy of \[KN{{O}_{3}}\]aqueous solution is \[35.8\text{ }kJ\text{ }rno{{l}^{-1}}\]. After the solute is dissolved the temperature of the solution will be:
A) 293 K
B) 298 K
C) 301 K
D) 304 K
View Answer play_arrowquestion_answer71) 4 moles each of \[S{{O}_{2}}\] and \[{{O}_{2}}\] gases are allowed to react to form \[S{{O}_{3}}\] in a closed vessel. At equilibrium 25% of \[{{O}_{2}}\] is used up. The total number of moles of all the gases at equilibrium is :
A) 6.5
B) 7.0
C) 8.0
D) 2.0
View Answer play_arrowquestion_answer72) An example for autocatalysis is :
A) oxidation of NO to \[N{{O}_{3}}\]
B) oxidation of \[S{{O}_{2}}\] to \[S{{O}_{3}}\]
C) decomposition of \[KCl{{O}_{3}}\] to \[KCl\] and \[{{O}_{2}}\]
D) oxidation of oxalic acid by acidified \[KMn{{O}_{4}}\]
View Answer play_arrowquestion_answer73) During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into :
A) \[NaN{{O}_{2}}\]
B) \[NaN{{H}_{2}}\]
C) NaCN
D) NaNC
View Answer play_arrowquestion_answer74) Identify the product Y in the following reaction sequence :
A) pentane
B) cyclobutane
C) cyclopentane
D) cyclopentanone
View Answer play_arrowquestion_answer75) The reaction \[{{C}_{2}}{{H}_{5}}ONa+{{C}_{2}}{{H}_{5}}I\to \]\[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] \[+NaI\] is known as :
A) Kolbes synthesis
B) Wurtzs synthesis
C) Williamsons synthesis
D) Grignards synthesis
View Answer play_arrowquestion_answer76) \[\Delta {{G}^{o}}vs\,T\] plot in the Ellinghams diagram slopes downwards for the reactions :
A) \[Mg+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}MgO\]
B) \[2Ag+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}A{{g}_{2}}O\]
C) \[C+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}CO\]
D) \[CO+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}\]
View Answer play_arrowquestion_answer77) Which of the following taking place in the blast furnace is endothermic?
A) \[CaC{{O}_{3}}\xrightarrow{{}}CaO+C{{O}_{2}}\]
B) \[2C+{{O}_{2}}\xrightarrow{{}}2CO\]
C) \[C+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}\]
D) \[F{{e}_{2}}{{O}_{3}}+3CO\xrightarrow{{}}2Fe+3C{{O}_{2}}\]
View Answer play_arrowquestion_answer78) Liquor ammonia bottles are opened only after cooling. This is because:
A) it is a mild explosive
B) it is a corrosive liquid
C) it is a lachrymatory
D) it generates high vapour pressure
View Answer play_arrowquestion_answer79) The formation of \[O_{2}^{+}\,{{[Pt{{F}_{6}}]}^{-}}\] is the basis for the formation of xenon fluorides. This is because:
A) \[{{O}_{2}}\] and \[Xe\]have comparable sizes
B) Both \[{{O}_{2}}\] and \[Xe\] are gases
C) \[{{O}_{2}}\] and \[Xe\] have comparable ionisation energies
D) \[{{O}_{2}}\] and \[Xe\] have comparable electro- negativities
View Answer play_arrowquestion_answer80) The highest magnetic moment is shown by the transition metal ion with the configuration:
A) \[3{{d}^{2}}\]
B) \[3{{d}^{5}}\]
C) \[3{{d}^{7}}\]
D) \[3{{d}^{9}}\]
View Answer play_arrowquestion_answer81) A transition metal ion exists in its highest oxidation state. It is expected to behave as:
A) a chelating agent
B) a central metal in a coordination compound
C) an oxidising agent
D) a reducing agent
View Answer play_arrowquestion_answer82) In which of the following complex ion, the central metal ion is in a state of \[s{{p}^{3}}{{d}^{2}}\]hybridisation?
A) \[{{[Co{{F}_{6}}]}^{3-}}\]
B) \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
C) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]
D) \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
View Answer play_arrowquestion_answer83) Which of the following can participate in linkage isomerism?
A) \[N{{O}_{2}}\]
B) \[{{H}_{2}}\overset{\,\,\bullet \,\,\bullet }{\mathop{N}}\,C{{H}_{2}}C{{H}_{2}}\overset{\,\,\bullet \,\,\bullet }{\mathop{N}}\,{{H}_{2}}\]
C) \[{{H}_{2}}O\]
D) \[_{\bullet }^{\bullet }N{{H}_{3}}\]
View Answer play_arrowquestion_answer84) Which of the following has the highest bond order?
A) \[{{N}_{2}}\]
B) \[{{O}_{2}}\]
C) \[H{{e}_{2}}\]
D) \[{{H}_{2}}\]
View Answer play_arrowquestion_answer85) Which of the following is diamagnetic?
A) \[H_{2}^{+}\]
B) \[{{O}_{2}}\]
C) \[L{{i}_{2}}\]
D) \[He_{2}^{+}\]
View Answer play_arrowquestion_answer86) The concentration of a reactant X decreases from 0.1 M to 0.005 M in 40 minute. If the reaction follows 1 order kinetics, the rate of the reaction when the concentration of X is M will be :
A) \[1.73\times {{10}^{-4}}M\,{{\min }^{-1}}\]
B) \[3.47\times {{10}^{-4}}M\,{{\min }^{-1}}\]
C) \[3.47\times {{10}^{-5}}M\,{{\min }^{-1}}\]
D) \[7.5\times {{10}^{-4}}M\,{{\min }^{-1}}\]
View Answer play_arrowquestion_answer87) Chemical reactions with very high \[{{E}_{a}}\] values are generally:
A) very fast
B) very slow
C) moderately fast
D) spontaneous
View Answer play_arrowquestion_answer88) Which of the following does not conduct electricity?
A) Fused \[NaCl\]
B) Solid \[NaCl\]
C) Brine solution
D) Copper
View Answer play_arrowquestion_answer89) When a quantity of electricity is passed through \[CuS{{O}_{4}}\]solution, 0.16 g of copper gets deposited. If the same quantity of electricity is passed through acidulated water, then the volume of \[{{H}_{2}}\] liberated at STP will be : [given: atomic weight of \[Cu=64\]]
A) \[4.0\,\,c{{m}^{3}}~\]
B) \[56\,\,c{{m}^{3}}~\]
C) \[604\,\,c{{m}^{3}}~\]
D) \[8.0\,\,c{{m}^{3}}~\]
View Answer play_arrowquestion_answer90) Solubility product of a salt AB is \[1\times {{10}^{-8}}{{M}^{2}}\]solution in which the concentration of \[{{A}^{+}}\] ions is \[{{10}^{-3}}M\]. The salt will precipitate when the concentration of B- ions is kept:
A) between \[{{10}^{-8}}\]to \[{{10}^{-7}}M\]
B) between \[{{10}^{-7}}M\] to \[{{10}^{-8}}M\]
C) \[>{{10}^{-5}}M\]
D) \[>{{10}^{-8}}M\]
View Answer play_arrowquestion_answer91) Which one of the following condition will increase the voltage of the cell represented by the equation? \[Cu(s)+2A{{g}^{+}}(aq)C{{u}^{2+}}(aq)+2Ag(s)\]
A) Increase in the dimension of Cu electrode
B) Increase in the dimension of Ag electrode
C) Increase in the concentration of \[C{{u}^{2+}}\]ions
D) Increase in the concentration of \[A{{g}^{+}}\] ions
View Answer play_arrowquestion_answer92) The pH of \[{{10}^{-8}}M\,HCl\] solution is :
A) 8
B) more than 8
C) between 6 and 7
D) slightly more than 7
View Answer play_arrowquestion_answer93) The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is :
A) 1 g
B) 3 g
C) 6 g
D) 18 g
View Answer play_arrowquestion_answer94) Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is because :
A) benzoic acid is an organic solute
B) benzoic acid has higher molar mass than benzene
C) benzoic acid gets associated in benzene
D) benzoic acid gets dissociated in benzene
View Answer play_arrowquestion_answer95) For a reaction to be spontaneous at all temperatures :
A) \[\Delta G\] and \[\Delta H\] should be negative
B) \[\Delta G\] and \[\Delta H\] should be positive
C) \[\Delta G=\Delta S=0\]
D) \[\Delta H<\Delta G\]
View Answer play_arrowquestion_answer96) Which of the following electrolyte will have maximum flocculation value for \[Fe\,{{(OH)}_{3}}\] sol?
A) \[NaCl\]
B) \[N{{a}_{2}}S\]
C) \[{{(N{{H}_{4}})}_{3}}P{{O}_{4}}\]
D) \[{{K}_{2}}S{{O}_{4}}\]
View Answer play_arrowquestion_answer97) For a reversible reaction: \[X(g)+3Y(g)2Z(g);\,\,\Delta H=-40\,kJ\], the standard entropies of X, Y and Z are 60, 40 and \[50\,\,J{{K}^{-1}}\,mo{{l}^{-1}}\] respectively. The temperature at which the above reaction attains equilibrium is about:
A) 400 K
B) 500 K
C) 273 K
D) 373 K
View Answer play_arrowquestion_answer98) The radii of \[N{{a}^{+}}\] and \[C{{l}^{-}}\]ions are 95 pm and 181 pm respectively. The edge length of \[NaCl\] unit cell is :
A) 276 pm
B) 138 pm
C) 552 pm
D) 415 pm
View Answer play_arrowquestion_answer99) Inductive effect involves :
A) displacement of \[\sigma \]-electrons
B) delocalisation of \[\pi \]-electrons
C) delocalisation of \[\sigma \]-electrons
D) displacement of \[\pi \]-electrons
View Answer play_arrowquestion_answer100) The basicity of aniline is less than that of cyclohexylamine. This is due to:
A) +R-effect of\[-N{{H}_{2}}\] group
B) \[-I\]effect of\[-N{{H}_{2}}\] group
C) -R effect of \[-N{{H}_{2}}\] group
D) hyperconjugation effect
View Answer play_arrowquestion_answer101) Methyl bromide is converted into ethane by heating it in ether medium with :
A) Al
B) Zn
C) Na
D) Cu
View Answer play_arrowquestion_answer102) Which of the following compound is expected to be optically active?
A) \[{{(C{{H}_{3}})}_{2}}CHCHO\]
B) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\]
C) \[C{{H}_{3}}C{{H}_{2}}CHBr\,\,CHO\]
D) \[C{{H}_{3}}C{{H}_{2}}CBrCHO\]
View Answer play_arrowquestion_answer103) Which cycloalkane has the lowest heat of combustion per \[C{{H}_{2}}\] group?
A) Cyclopropane
B) Cyclobutane
C) Cyclopentane
D) Cyclohexane
View Answer play_arrowquestion_answer104) The catalyst used in the preparation of an alkyl chloride by the action of dry \[HCl\] on an alcohol is :
A) anhydrous \[AlC{{l}_{3}}\]
B) \[FeC{{l}_{3}}\]
C) anhydrous \[ZnC{{l}_{2}}\]
D) Cu
View Answer play_arrowquestion_answer105) In the reaction,\[R-X\xrightarrow{alcoholic\text{ }KCN}A\xrightarrow{dilute\text{ }HCl}B\] The product B is :
A) alkyl chloride
B) aldehyde
C) carboxylic acid
D) ketone
View Answer play_arrowquestion_answer106) Which of the following compound would not evolve \[C{{O}_{2}}\] when treated with \[NaHC{{O}_{3}}\]solution?
A) Salicylic acid
B) Phenol
C) Benzoic acid
D) 4-nitrobenzoic acid
View Answer play_arrowquestion_answer107) By heating phenol with chloroform in alkali, it is converted into:
A) salicylic acid
B) salicylaldehyde
C) anisole
D) phenyl benzoate
View Answer play_arrowquestion_answer108) When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is :
A) cetophenone
B) benzaldehyde
C) benzophenone
D) acetaldehyde
View Answer play_arrowquestion_answer109) Which of the following does not give benzoic acid on hydrolysis?
A) Phenyl cyanide
B) Benzoyl chloride
C) Benzyl chloride
D) Methyl benzoate
View Answer play_arrowquestion_answer110) Which of the following would undergo Hofmann reaction to give a primary amine?
A) \[R-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-Cl~~~\]
B) \[RCONHC{{H}_{3}}\]
C) \[RCON{{H}_{2}}\]
D) \[RCOOR\]
View Answer play_arrowquestion_answer111) Glucose contains in addition to aldehyde group :
A) one secondary OH and four primary OH groups
B) one primary OH and four secondary OH groups
C) two primary OH and three secondary OH groups
D) three primary OH and two secondary OH groups
View Answer play_arrowquestion_answer112) A distinctive and characteristic functional group of fats is
A) a peptide group
B) an ester group
C) an alcoholic group
D) a ketonic group
View Answer play_arrowquestion_answer113) At \[pH=4\], glycine exists as :
A) \[{{H}_{3}}\overset{+}{\mathop{N}}\,-C{{H}_{2}}-CO{{O}^{-}}\]
B) \[{{H}_{3}}\overset{+}{\mathop{N}}\,-C{{H}_{2}}-CO{{O}^{-}}\]
C) \[{{H}_{2}}N-C{{H}_{2}}-COOH\]
D) \[{{H}_{2}}N-C{{H}_{2}}-CO{{O}^{-}}\]
View Answer play_arrowquestion_answer114) Insulin regulates the metabolism of :
A) minerals
B) ammo acids
C) glucose
D) vitamins
View Answer play_arrowquestion_answer115) The formula mass of Mohrs salt is 392. The iron present in it is oxidised by \[KMn{{O}_{4}}\] in acid medium. The equivalent mass of Mohrs salt is:
A) 392
B) 31.6
C) 278
D) 156
View Answer play_arrowquestion_answer116) The brown ring test for nitrates depends on :
A) the reduction of nitrate to nitric oxide
B) oxidation of nitric oxide to nitrogen dioxide
C) reduction of ferrous sulphate to iron
D) oxidising action of sulphuric acid
View Answer play_arrowquestion_answer117) Acrolein test is positive for :
A) polysaccharides
B) proteins
C) oils and fats
D) reducing sugars
View Answer play_arrowquestion_answer118) An organic compound which produces a bluish green coloured flame on heating in presence of copper is :
A) chlorobenzene
B) benzaldehyde
C) aniline
D) benzoic acid
View Answer play_arrowquestion_answer119) For a reaction \[A+B\xrightarrow{{}}C+D\] if the concentration of A is doubled without alteming the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without alteming the concentration of A, the rate gets tripled. The order of the reaction is :
A) 2
B) 1
C) 3/2
D) 4/3
View Answer play_arrowquestion_answer120) Which of the following solutions will exhibit highest boiling point?
A) \[0.01\,M\,N{{a}_{2}}S{{O}_{4}}(aq)\]
B) \[0.01\,M\,KN{{O}_{3}}(aq)\]
C) 0.015 M urea(aq)
D) 0.015 M glucose(aq)
View Answer play_arrowquestion_answer121) If \[(P\wedge \sim r)\to \,(\sim p\vee q)\] is false, then the truth values of p, q and r are respectively :
A) T, F and F
B) F, F and T
C) F, T and T
D) T, F and T
View Answer play_arrowquestion_answer122) If \[\alpha ,\,\beta \] and \[\gamma \] are the. roots, of the equation\[{{x}^{3}}-8x+8=0\], then \[\sum \,\,{{\alpha }^{2}}\] and \[\sum \frac{1}{\alpha \beta }\] are respectively :
A) 0 and-16
B) 16 and 8
C) -16 and 0
D) 16 and 0
View Answer play_arrowquestion_answer123) The gcd of 1080 and 675 is :
A) 145
B) 135
C) 225
D) 125
View Answer play_arrowquestion_answer124) If \[a\,|(b+c)\] and \[\,|(b-c)\] where \[a,\,b,\,c\,\in N\] then:
A) \[{{b}^{2}}\equiv {{c}^{2}}(\bmod \,{{a}^{2}})\]
B) \[{{b}^{2}}\equiv {{c}^{2}}(\bmod \,{{a}^{2}})\]
C) \[{{a}^{2}}\equiv {{b}^{2}}(\bmod \,{{c}^{2}})\]
D) \[{{c}^{2}}\equiv {{a}^{2}}(\bmod \,{{b}^{2}})\]
View Answer play_arrowquestion_answer125) If a, b and \[c\in N\], then which one of the following is not true?
A) \[a\left| \text{ }b\text{ }and\text{ }a \right|c\Rightarrow a|3b+2c\]
B) \[a\left| \text{ }b\text{ }and\text{ }b \right|c\Rightarrow a|c\]
C) \[a\left| \text{(}b+b)\Rightarrow a \right|b\Rightarrow and\,a|c\]
D) \[a\left| \text{(}b\,\,and\,a \right|c\Rightarrow \,a\,|b+c\]
View Answer play_arrowquestion_answer126) \[x=4\,(1+\cos \theta )\] and \[y=3\,\,(1+\sin \theta )\] are the parametric equations of:
A) \[\frac{{{(x-3)}^{2}}}{9}+\frac{{{(y-4)}^{2}}}{16}=1\]
B) \[\frac{{{(x+4)}^{2}}}{16}+\frac{{{(y+3)}^{2}}}{9}=1\]
C) \[\frac{{{(x-4)}^{2}}}{16}-\frac{{{(y-3)}^{2}}}{9}=1\]
D) \[\frac{{{(x-4)}^{2}}}{16}+\frac{{{(y-3)}^{2}}}{9}=1\]
View Answer play_arrowquestion_answer127) If the distance between the foci and the distance between the directories of the hyperbola \[\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1\] are in the ratio \[3:2\], then \[a:b\] is :
A) \[\sqrt{2}:1\]
B) \[\sqrt{3}:\sqrt{2}\]
C) \[1:2\]
D) \[2:1\]
View Answer play_arrowquestion_answer128) The ellipse \[\frac{{{x}^{2}}}{25}+\frac{{{y}^{\mathbf{2}}}}{16}=1\] and the hyperbola\[\frac{{{x}^{2}}}{25}-\frac{{{y}^{\mathbf{2}}}}{16}=1\] have in common :
A) centre only
B) centre, foci and directrices
C) centre, foci and vertices
D) centre and vertices only
View Answer play_arrowquestion_answer129) If \[\sec \theta =m\] and \[\tan \theta =n\], then\[\frac{1}{m}\left[ \,(m+n)+\frac{1}{(m+n)} \right]\] is :
A) 2
B) 2m
C) 2n
D) mn
View Answer play_arrowquestion_answer130) The value of \[\frac{\sin {{85}^{o}}-\sin {{35}^{o}}}{\cos {{65}^{o}}}\] is :
A) 2
B) -1
C) 1
D) 0
View Answer play_arrowquestion_answer131) If the length of the tangent from any point on the circle \[{{(x-3)}^{2}}+{{(y+2)}^{2}}=5{{r}^{2}}\] to the circle \[{{(x-3)}^{2}}+{{(y+2)}^{2}}={{r}^{2}}\] is 16 unit, then the area between the two circles in sq unit is:
A) \[32\pi \]
B) \[4\pi \]
C) \[8\pi \]
D) \[256\pi \]
View Answer play_arrowquestion_answer132) The circles \[a{{x}^{2}}+a{{y}^{2}}+2{{g}_{1}}x+2{{f}_{1}}y+{{c}_{1}}=0\] and \[b{{x}^{2}}+b{{y}^{2}}+2{{g}_{2}}x+2{{f}_{2}}y+{{c}_{2}}=0\](\[a\ne 0\] and \[b\ne 0\]) cut orthogonally if:
A) \[{{g}_{1}}{{g}_{2}}+{{f}_{1}}{{f}_{2}}=a{{c}_{1}}+{{b}_{2}}\]
B) \[2({{g}_{1}}{{g}_{2}}+{{f}_{1}}{{f}_{2}})=b{{c}_{1}}+a{{c}_{2}}\]
C) \[b{{g}_{1}}{{g}_{2}}+a{{f}_{1}}{{f}_{2}}=b{{c}_{1}}+a{{c}_{2}}\]
D) \[{{g}_{1}}{{g}_{2}}+{{f}_{1}}{{f}_{2}}={{c}_{1}}+{{c}_{2}}\]
View Answer play_arrowquestion_answer133) The equation of the common tangent of the two touching circles, \[{{y}^{2}}+{{x}^{2}}-6x-12y+37=0\] and\[{{x}^{2}}+{{y}^{2}}-6y+7=0\] is :
A) \[x-y-5=0\]
B) \[x-y+5=0\]
C) \[c-y-5=0\]
D) \[r+y+5=0\]
View Answer play_arrowquestion_answer134) The equation of the parabola with vertex at (-1,1) and focus (2, 1) is :
A) \[{{y}^{2}}-2y-12x-11=0\]
B) \[{{x}^{2}}+2x-12y+13=0\]
C) \[{{y}^{2}}-2y+12x+11=0\]
D) \[{{y}^{2}}-2y-12x+13=0\]
View Answer play_arrowquestion_answer135) The equation of the line which is tangent to both the circle \[{{x}^{2}}+{{y}^{2}}=5\] and the parabola\[{{y}^{2}}=40x\] is:
A) \[2x-y\pm 5=0\]
B) \[2x-y+5=0\]
C) \[2x-y-5=0\]
D) \[2x+y+5=0\]
View Answer play_arrowquestion_answer136) If \[2A+3B=\left[ \begin{align} & \begin{matrix} 2 & -1 & 4 \\ \end{matrix} \\ & \begin{matrix} 3 & 2 & 5 \\ \end{matrix} \\ \end{align} \right]\] and\[A+2B=\left[ \begin{align} & \begin{matrix} 5 & 0 & 3 \\ \end{matrix} \\ & \begin{matrix} 1 & 6 & 2 \\ \end{matrix} \\ \end{align} \right]\] then B is:
A) \[\left[ \begin{align} & \begin{matrix} 8 & -1 & 2 \\ \end{matrix} \\ & \begin{matrix} -1 & 10 & -1 \\ \end{matrix} \\ \end{align} \right]\]
B) \[\left[ \begin{align} & \begin{matrix} 8 & -1 & 2 \\ \end{matrix} \\ & \begin{matrix} -1 & 10 & -1 \\ \end{matrix} \\ \end{align} \right]\]
C) \[\left[ \begin{align} & \begin{matrix} 8 & 1 & -2 \\ \end{matrix} \\ & \begin{matrix} -1 & 10 & -1 \\ \end{matrix} \\ \end{align} \right]\]
D) \[\left[ \begin{align} & \begin{matrix} 8 & 1 & 1 \\ \end{matrix} \\ & \begin{matrix} 1 & 10 & 1 \\ \end{matrix} \\ \end{align} \right]\]
View Answer play_arrowquestion_answer137) If \[O(A)=2\times 3,\,O(B)=3\times 2\], and \[O(C)=3\times 3\], which one of the following is not defined?
A) \[CB+A\]
B) BAC
C) \[C(A+B)\]
D) \[C(A+B)\]
View Answer play_arrowquestion_answer138) If \[A=\left[ \begin{matrix} 1 & -3 \\ 2 & k \\ \end{matrix} \right]\] and \[{{A}^{2}}-4A+10I=A\], then \[k\] is equal to:
A) 0
B) -4
C) 4 and not 1
D) 1 or 4
View Answer play_arrowquestion_answer139) The value of \[\left| \begin{matrix} x+y & y+z & z+x \\ x & y & z \\ x-y & y-z & z-x \\ \end{matrix} \right|\] is equal to:
A) \[2{{(x+y+z)}^{2}}\]
B) \[2{{(x+y+z)}^{3}}\]
C) \[{{(x+y+z)}^{3}}\]
D) 0
View Answer play_arrowquestion_answer140) On the set Q of all rational numbers the operation * which is both associative and commutative is given by a * b, is :
A) \[a+b+ab\]
B) \[{{a}^{2}}+{{b}^{2}}\]
C) \[ab+1\]
D) \[2a+3b\]
View Answer play_arrowquestion_answer141) From an aeroplane flying, vertically above a horizontal road, the angles of depression of two consecutive stones on the same side of the aeroplane are observed to be \[{{30}^{o}}\] and \[{{60}^{o}}\] respectively. The height at which the aeroplane is flying in km is :
A) \[\frac{4}{\sqrt{3}}\]
B) \[\frac{\sqrt{3}}{2}\]
C) \[\frac{2}{\sqrt{3}}\]
D) 2
View Answer play_arrowquestion_answer142) If the angles of a triangle are in the ratio\[3:4:5\], then the sides are in the ratio :
A) \[2:\sqrt{6}:\sqrt{3}+1\]
B) \[\sqrt{2}:\sqrt{6}:\sqrt{3}+1\]
C) \[2:\sqrt{3}:\sqrt{3}+1\]
D) \[3:4:5\]
View Answer play_arrowquestion_answer143) If \[{{\cos }^{-1}}x=\alpha ,\,(0<x<1)\] and \[{{\sin }^{-1}}(2x\sqrt{1-{{x}^{2}}})+{{\sec }^{-1}}\left( \frac{1}{2{{x}^{2}}-1} \right)=\frac{2\pi }{3}\], then \[{{\tan }^{-1}}(2x)\] equals :
A) \[\frac{\pi }{6}\]
B) \[\frac{\pi }{4}\]
C) \[\frac{\pi }{3}\]
D) \[\frac{\pi }{2}\]
View Answer play_arrowquestion_answer144) If \[a>b>0\], then the value of\[{{\tan }^{-1}}\left( \frac{a}{b} \right)+{{\tan }^{-1}}\left( \frac{a+b}{a-b} \right)\] depends on :
A) both a and b
B) b and not a
C) a and not b
D) neither a nor b
View Answer play_arrowquestion_answer145) Which one of the following equations has no solution?
A) \[\cos ec\theta -\sec \theta =\cos ec\theta \,.\,\,\sec \theta \]
B) \[\cos ec\theta \,.\,\,\sec \theta =1\]
C) \[\cos \theta +\sin \theta =\sqrt{2}\]
D) \[\sqrt{3}\,\sin \theta -\cos \theta =2\]
View Answer play_arrowquestion_answer146) If \[A=\{a,\,b,\,c\},\,B=\{b,\,c,\,d\}\] and \[C=\{a,\,d,\,c\}\]then \[(A-B)\times (B\cap C)\] is equal to :
A) \[\{(a,c),(a,d)\}\]
B) \[\{(a,\text{ }6),(c,\text{ }d)\}\]
C) \[\{(c,\text{ }a),(d,\text{ }a)\}\]
D) \[\{(a,\text{ }c),(a,\text{ }d),(b,\text{ }d)\text{ }\!\!\}\!\!\text{ }\]
View Answer play_arrowquestion_answer147) The function \[f:X\to Y\] defined by \[f(x)=\sin x\] is one-one but not onto, if X and Y are respectively equal to :
A) R and R
B) \[\left[ 0,\frac{\pi }{2} \right]\] and [0,1]
C) \[\left[ \frac{-\pi }{2},\frac{\pi }{2} \right]\] and [-1, 1]
D) \[\left[ \frac{-\pi }{2},\frac{\pi }{2} \right]\] and [-1, 1]
View Answer play_arrowquestion_answer148) If \[{{\log }_{4}}2+{{\log }_{4}}4+{{\log }_{4}},\,x+{{\log }_{4}}16=6\], then value of \[x\]is :
A) 64
B) 4
C) 8
D) 32
View Answer play_arrowquestion_answer149) If \[{{S}_{n}}=\frac{1}{6.11}+\frac{1}{11.16}+\frac{1}{16.21}+.....\] to n terms, then \[6{{S}_{n}}\], equals :
A) \[\frac{5n-4}{5n+6}\]
B) \[\frac{n}{(5n+6)}\]
C) \[\frac{2n-1}{5n+6}\]
D) \[\frac{1}{(5n+6)}\]
View Answer play_arrowquestion_answer150) The remainder obtained when \[{{(1!)}^{2}}+{{(2!)}^{2}}+{{(3!)}^{2}}+....+{{(100!)}^{2}}\] is divided by \[{{10}^{2}}\] is:
A) 27
B) 28
C) 17
D) 14
View Answer play_arrowquestion_answer151) In the group G = {1,5,7,11} under multiplication modulo 12, the solution of\[{{7}^{-1}}{{\otimes }_{12}}\,(x\,{{\otimes }_{12}}11)=5\] is equals :
A) 5
B) 1
C) 7
D) 11
View Answer play_arrowquestion_answer152) A subset of the additive group of real numbers which is not a subgroup is :
A) ({0}, +)
B) (Z, +)
C) (N, +)
D) (Q, +)
View Answer play_arrowquestion_answer153) If \[\vec{p}=\hat{i}=+\hat{j},\vec{q}=4k-\text{ }\hat{j}\] and \[\vec{r}=\hat{i}+\hat{k}\] then the unit vector in the direction of \[3\vec{p}+\vec{q}-2\vec{r}\] is:
A) \[\frac{1}{3}(\hat{i}+2\hat{j}+2\hat{k})\]
B) \[\frac{1}{3}(\hat{i}-2\hat{j}-2\hat{k})\]
C) \[\frac{1}{3}(\hat{i}-2\hat{j}+2\hat{k})\]
D) \[\hat{i}+2\hat{j}+2\hat{k}\]
View Answer play_arrowquestion_answer154) If a and b are the two vectors such that \[|\vec{a}|=3\sqrt{3},\,|\vec{b}|=4\] and \[|\vec{a}+\vec{b}|=\sqrt{7}\], then the angle between a and b is:
A) \[{{120}^{o}}\]
B) \[{{60}^{o}}\]
C) \[{{30}^{o}}\]
D) \[{{150}^{o}}\]
View Answer play_arrowquestion_answer155) If \[\vec{a}\] is vector perpendicular to both \[\vec{b}\] and \[\vec{c}\], then :
A) \[\vec{a}+(\vec{b}+\vec{c})=\vec{0}\]
B) \[\vec{a}\times (\vec{b}+\vec{c})=\vec{0}\]
C) \[\vec{a}\times (\vec{b}\times \vec{c})=\vec{0}\]
D) \[\vec{a}\,\,.\,\,(\vec{b}\times \vec{c})=\vec{0}\]
View Answer play_arrowquestion_answer156) If the area of the parallelogram with \[\vec{a}\] and \[\vec{b}\]as two adjacent sides is 15 sq unit, then the area of the parallelogram having, \[3\vec{a}+2\vec{b}\] and \[\vec{a}+3\vec{b}\] as two adjacent sides in sq unit is :
A) 120
B) 105
C) 75
D) 45
View Answer play_arrowquestion_answer157) The locus of the point which moves such that the ratio of its distance from two fixed point in the plane is always a constant \[k\,(<1)\] is :
A) hyperbola
B) ellipse
C) straight line
D) circle
View Answer play_arrowquestion_answer158) If the lines \[x+3y-9=0,4x+by-2=0\] and \[2x-y-4=0\] are concurrent, then b equals :
A) -5
B) 5
C) 1
D) 0
View Answer play_arrowquestion_answer159) The lines represented by \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\] are perpendicular to each other, if:
A) \[{{h}^{2}}=a+b\]
B) \[a+b=0\]
C) \[{{h}^{2}}=ab\]
D) \[h=0\]
View Answer play_arrowquestion_answer160) The equation of the circle having \[x-y-2=0\]and \[x-y+2=0\] as two tangents and \[x-y=0\] as a diameter is :
A) \[{{x}^{2}}+{{y}^{2}}+2x-2y+1=0\]
B) \[{{x}^{2}}+{{y}^{2}}-2x+2y-1=0\]
C) \[{{x}^{2}}+{{y}^{2}}=2\]
D) \[{{x}^{2}}+{{y}^{2}}=1\]
View Answer play_arrowquestion_answer161) If the curve \[y=2{{x}^{3}}+a{{x}^{2}}+bx+c\] passes through the origin and the tangents drawn to it at \[x=-1\] and \[x=2\] are parallel to the x-axis, then the values of a, b and c are respectively:
A) 12,-3 and 0
B) - 3,-12 and 0
C) - 3,12 and 0
D) 3, -12 and 0
View Answer play_arrowquestion_answer162) A circular sector of perimeter 60 m with maximum area is to be constructed. The radius of the circular arc in metre must be :
A) 20
B) 5
C) 15
D) 10
View Answer play_arrowquestion_answer163) The tangent and the normal drawn to the curve \[y={{x}^{2}}-x+4\] at P(1, 4) cut the x-axis at A and B respectively. If the length of the sub tangent drawn to the curve at P is equal to the length of the subnormal, then the area of the triangle PAB in sq unit is :
A) 4
B) 32
C) 8
D) 16
View Answer play_arrowquestion_answer164) \[\int{\frac{({{x}^{3}}+3{{x}^{2}}+3x+1)}{{{(x+1)}^{5}}}}\] is equal to :
A) \[-\frac{1}{(x+1)}+c\]
B) \[\frac{1}{5}\log \,\,(x+1)+c\]
C) \[\log \,(x+1)+c\]
D) \[{{\tan }^{-1}}x+c\]
View Answer play_arrowquestion_answer165) \[\int{\frac{\cos ecx}{{{\cos }^{2}}\left( 1+\log \,\tan \frac{x}{2} \right)}dx}\] is equal to :
A) \[{{\sin }^{2}}\left[ 1+\log \,\tan \frac{x}{2} \right]+c\]
B) \[\tan \left[ 1+\log \,\tan \frac{x}{2} \right]+c\]
C) \[{{\sec }^{2}}\left[ 1+\log \,\tan \frac{x}{2} \right]+c\]
D) \[-\tan \left[ 1+\log \,\tan \frac{x}{2} \right]+c\]
View Answer play_arrowquestion_answer166) The complex number \[\frac{(-\sqrt{3}+3i)\,(1-i)}{(3+\sqrt{3}\,i)\,(i)\,(\sqrt{3}+\sqrt{3}i)}\] when represented in the Argand diagram is :
A) in the second quadrant
B) in the first quadrant
C) on the y-axis (imaginary axis)
D) on the x-axis (real axis).
View Answer play_arrowquestion_answer167) If \[2x=-1\,+\sqrt{3}\,i\], then the value of \[{{(1-{{x}^{2}}+x)}^{6}}-{{(1-x+{{x}^{2}})}^{6}}\] is equal to :
A) 32
B) -64
C) 64
D) 0
View Answer play_arrowquestion_answer168) The modulus and amplitude of \[{{(1+i\sqrt{3})}^{8}}\] are respectively:
A) 256 and \[\frac{\pi }{3}\]
B) 256 and \[\frac{2\pi }{3}\]
C) 2and \[\frac{2\pi }{3}\]
D) 256 and \[\frac{8\pi }{3}\]
View Answer play_arrowquestion_answer169) The value of \[\underset{x\to 0}{\mathop{\lim }}\,\frac{{{5}^{x}}-{{5}^{-x}}}{2x}\] is :
A) \[\log 5\]
B) 0
C) 1
D) \[2\,\log 5\]
View Answer play_arrowquestion_answer170) Which one of the following is not true always?
A) If \[f(x)\] is not continuous at \[x=a\], then it is not differentiable at \[x=a\]
B) If \[f(x)\] is continuous at \[x=a\], then it is differentiable at \[x=a\]
C) If \[f(x)\] and \[g(x)\] are differentiable at \[x=a\], then \[f(x)+g(x)\] is also differentiable at \[x=a\]
D) If a function \[f(x)\] is continuous at \[x=a\], then \[\underset{x\to a}{\mathop{\lim }}\,f(x)\] exists
View Answer play_arrowquestion_answer171) \[\int{\frac{dx}{x\sqrt{{{x}^{6}}-16}}}\] is equal; to :
A) \[\frac{1}{3}{{\sec }^{-1}}\left( \frac{{{x}^{3}}}{4} \right)+c\]
B) \[{{\cosh }^{-1}}\left( \frac{{{x}^{3}}}{4} \right)+c\]
C) \[\frac{1}{12}{{\sec }^{-1}}\left( \frac{{{x}^{3}}}{4} \right)+c\]
D) \[{{\sec }^{-1}}\left( \frac{{{x}^{3}}}{4} \right)+c\]
View Answer play_arrowquestion_answer172) If \[{{I}_{1}}=\int_{0}^{\pi /2}{x\sin x\,dx}\] and \[{{I}_{2}}=\int_{0}^{\pi /2}{x\cos x\,dx}\], then which one of the following is true?
A) \[{{I}_{1}}+{{I}_{2}}=\frac{\pi }{2}\]
B) \[{{I}_{2}}-{{I}_{1}}=\frac{\pi }{2}\]
C) \[{{I}_{1}}+{{I}_{2}}=0\]
D) \[{{I}_{1}}={{I}_{2}}\]
View Answer play_arrowquestion_answer173) If \[f(x)\] is defined [-2,2] by \[f(x)=4{{x}^{3}}-3x+1\] and\[g(x)=\frac{f(-x)-f(x)}{{{x}^{2}}+3}\],then \[\int_{-2}^{2}{g\,(x)\,dx}\] is equal to :
A) 64
B) -48
C) 0
D) 24
View Answer play_arrowquestion_answer174) The area enclosed between the parabola\[y={{x}^{2}}-x+2\] and the line \[y=x+2\] in sq unit equals :
A) \[\frac{8}{3}\]
B) \[\frac{1}{3}\]
C) \[\frac{2}{3}\]
D) \[\frac{4}{3}\]
View Answer play_arrowquestion_answer175) The solution of the differential equation \[{{e}^{-x}}(y+1)\,dy+({{\cos }^{2}}x+\sin 2x)y\,dx=0\]subjected to the condition that \[y=1\] when\[x=0\] is :
A) \[y+\log \,\,y+{{e}^{x}}{{\cos }^{2}}x=2\]
B) \[\log \,\,(y+1)+{{e}^{x}}{{\cos }^{2}}x=1\]
C) \[y+\log \,y={{e}^{x}}{{\cos }^{2}}x\]
D) \[(y+1)+{{e}^{x}}{{\cos }^{2}}x=2\]
View Answer play_arrowquestion_answer176) If \[y=1+\frac{1}{x}+\frac{1}{{{x}^{2}}}+\frac{1}{{{x}^{3}}}+.....\] to \[\infty \] with \[|x|>1\], then \[\frac{dy}{dx}\] is :
A) \[\frac{{{x}^{2}}}{{{y}^{2}}}\]
B) \[{{x}^{2}}{{y}^{2}}\]
C) \[\frac{{{y}^{2}}}{{{x}^{2}}}\]
D) \[\frac{-{{y}^{2}}}{{{x}^{2}}}\]
View Answer play_arrowquestion_answer177) If \[f(x)\] and \[g(x)\] are two functions with\[g(x)=x-\frac{1}{x}\] and \[fog(x)={{x}^{3}}-\frac{1}{{{x}^{3}}}\], then \[f(x)\] is:
A) \[3{{x}^{2}}+3\]
B) \[{{x}^{2}}-\frac{1}{{{x}^{2}}}\]
C) \[1+\frac{1}{{{x}^{2}}}\]
D) \[3{{x}^{2}}+\frac{3}{{{x}^{4}}}\]
View Answer play_arrowquestion_answer178) The derivative of \[{{a}^{\sec x}}\] w.r.t. \[{{a}^{\tan x}}(a>0)\] is.
A) \[\sec x\,{{a}^{\sec x-\tan x}}\]
B) \[\sin x\,{{a}^{\tan x-\sec x}}\]
C) \[\sin x\,{{a}^{\sec x-\tan x}}\]
D) \[{{a}^{\sec x-\tan x}}\]
View Answer play_arrowquestion_answer179) If \[\sin \,(x+y)\,+\cos \,(x+y)=\log \,(x+y)\], then \[\frac{{{d}^{2}}y}{d{{x}^{2}}}\] is :
A) \[\frac{-y}{x}\]
B) 0
C) - 1
D) 1
View Answer play_arrowquestion_answer180) If \[f(x)\] is a function such that\[f(x)+f(x)=0\] and \[g(x)={{[f(x)]}^{2}}+{{[f(x)]}^{2}}\] and \[g(3)=3\] then\[g(8)\] is equal to :
A) 5
B) 0
C) 3
D) 8
View Answer play_arrow
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