PHYSICS- PAGE 1
1. Which one of the following statements is NOT correct?
(a). The velocity of sound in air increases with the increase of temperature
(b). The velocity of sound in air is independent of pressure
(c). The velocity of sound in air decreases as the humidity increases
(d). The velocity of sound in air is not affected by the change in amplitude and frequency
Answer: The velocity of sound in air decreases as the humidity increases
2. Diffusion of light in the atmosphere takes place due to
(a). Carbon Dioxide
(b). Dust Particles
(c). Helium
(d). Water Vapours
Answer: Dust Particles
3. Consider the following statements :
1. Steam at 100 degree C and boiling water at 100 degree C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditioner, heat is extracted from the room-air at the evaporator coils and is rejected out at the condenser coils.
Which of thse statements is / are correct ?
(a). 1 and 2
(b). 2 and 3
(c). Only 2
(d). Only 3
Answer: Only 3
4. Which of the following cannot be classified as electromagnetic waves?
(a). Radio waves
(b). X-ray
(c). Infrared waves
(d). Sound waves
Answer: Sound waves
5. Which of the following is not an electromagnetic wave?
(a). Light waves
(b). X-rays
(c). Sound waves
(d). Heat radiation
Answer: Sound wave
6. High input impedance, high current and power gain are achieved in
(a). common emitter circuits
(b). common collector circuits
(c). common base circuit
(d). vacuum tube circuits
Answer: common emitter circuits
7. The escape velocity of a projectile from the earth is approximately
(a). 11.2 km/s
(b). 7 km/s
(c). 8.9 km/s
(d). 23.4 km/s
Answer: 11.2 km/s
8. Light energy is the kinetic energy of the corpuscles, according to?
(a). Huygen's theory
(b). Doppler effect
(c). Seebeck effect
(d). Newton's theoy.
Answer: Newton's theory.
9. The current gain and power gain in a transistor circuit are high in the
(a). common base circuit
(b). common collector circuit
(c). common emitter circuit
(d). common base circuit and common collector circuit
Answer: common emitter circuit
10. In a common emitter configuration, the input terminal is
(a). the collector
(b). either the collector or the emitter
(c). the base
(d). the emitter.
Answer: the base
11. The relation between current gain in common base mode α and that in common emitter mode β in a transistor is
(a). α= β/1+ β
(b). β=α/1+α
(c). β=α/1-α
(d). α=β/1-β
Answer: α= β/1+ β
12. The base- emitter voltage of 250 mV is applied to a transistor in common emitter configuration. If the base current is 150µA, then the input impedance is
(a). 1.66 kΩ
(b). 7.68kΩ
(c). 2 kΩ
(d). 4 kΩ
Answer: 1.66 kΩ
13. The velocity of light is
(a). greater in denser medium
(b). Greater in rarer medium
(c). Independent of the medium
(d). Zero in the vacuum
Answer: Greater in rarer medium.
14. When a vehicle passes, TV reception gets distorted due to
(a). Spark plug creating electromagnetic disturbances
(b). Metal reflecting radio waves
(c). Passing vehicle affecting TV components
(d). Use of electronic ignition system
Answer: Spark plug creating electromagnetic disturbances
15. If the velocity of light in vacuum is c m/s, then the velocity of light in a medium of refractive index 1.6 is
(a). 1.6 cm/sec
(b). C/1.6 m/sec
(c). 1.6/c m/sec
(d). C m/sec
Answer: c/1.6 m/sec
16. When a monochromatic beam of light passes from a denser medium into a rarer medium, it's
(a). Velocity decreases
(b). Velocity increases
(c). Frequency decreases
(d). Wavelength decreases
Answer: velocity increases
17. The common emitter circuit has
(a). low input impedance and high power gain
(b). high input impedance and high power gain
(c). high input impedance and low power gain
(d). low input impedance and low power gain
Answer: high input impedance and high power gain
18. In which of the following media, the velocity of light is maximum?
(a). Water
(b). Glass
(c). Air
(d). Salt water
Answer: air
19. In a common base transistor circuit, the ratio of variation of collector current to the corresponding variation of emitter current at constant collector to base potential is
(a). current gain
(b). input impedance
(c). output impedance
(d). voltage amplification factor
Answer: current gain
20. The unit of capacitance is
(a). Henry
(b). Ohm
(c). Farad
(d). Ampere
Answer: Option-C
21. Which one of the following is not electromagnetic wave?
(a). Gamma rays
(b). X-rays
(c). Beta rays
(d). Microwaves
Answer: Beta rays
22. In N-type semiconductor, the majority carriers of charge are
(a). holes
(b). electrons
(c). electrons and holes
(d). neutrons
Answer: electrons
23. A beaker is completely filled with hot water. It takes t 1 seconds to cool from 80°C to 75°C t2 seconds to cool from 75°C to 70°C
t3 seconds to cool from 70°C to 65°C then
(a). t1=t2=t3
(b).t1<t2=t3
(c).t1<t2<t3
(d) t1>t2>t3
Answer: t1<t2<t3
24. The number of images formed by an object kept between two parallel mirrors is:
(a). One
(b).Zero
(c). Infinity
(d).Three
Answer: Infinity
25. Devices such as hydraulic lift and hydraulic brakes are based on_____________
A:-Pascal´s law
B:-Hooke’s law
C:-Bernoulli’s theorem
D:-Archimedes principle
Correct Answer:- Option-A
(a). The velocity of sound in air increases with the increase of temperature
(b). The velocity of sound in air is independent of pressure
(c). The velocity of sound in air decreases as the humidity increases
(d). The velocity of sound in air is not affected by the change in amplitude and frequency
Answer: The velocity of sound in air decreases as the humidity increases
2. Diffusion of light in the atmosphere takes place due to
(a). Carbon Dioxide
(b). Dust Particles
(c). Helium
(d). Water Vapours
Answer: Dust Particles
3. Consider the following statements :
1. Steam at 100 degree C and boiling water at 100 degree C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditioner, heat is extracted from the room-air at the evaporator coils and is rejected out at the condenser coils.
Which of thse statements is / are correct ?
(a). 1 and 2
(b). 2 and 3
(c). Only 2
(d). Only 3
Answer: Only 3
4. Which of the following cannot be classified as electromagnetic waves?
(a). Radio waves
(b). X-ray
(c). Infrared waves
(d). Sound waves
Answer: Sound waves
5. Which of the following is not an electromagnetic wave?
(a). Light waves
(b). X-rays
(c). Sound waves
(d). Heat radiation
Answer: Sound wave
6. High input impedance, high current and power gain are achieved in
(a). common emitter circuits
(b). common collector circuits
(c). common base circuit
(d). vacuum tube circuits
Answer: common emitter circuits
7. The escape velocity of a projectile from the earth is approximately
(a). 11.2 km/s
(b). 7 km/s
(c). 8.9 km/s
(d). 23.4 km/s
Answer: 11.2 km/s
8. Light energy is the kinetic energy of the corpuscles, according to?
(a). Huygen's theory
(b). Doppler effect
(c). Seebeck effect
(d). Newton's theoy.
Answer: Newton's theory.
9. The current gain and power gain in a transistor circuit are high in the
(a). common base circuit
(b). common collector circuit
(c). common emitter circuit
(d). common base circuit and common collector circuit
Answer: common emitter circuit
10. In a common emitter configuration, the input terminal is
(a). the collector
(b). either the collector or the emitter
(c). the base
(d). the emitter.
Answer: the base
11. The relation between current gain in common base mode α and that in common emitter mode β in a transistor is
(a). α= β/1+ β
(b). β=α/1+α
(c). β=α/1-α
(d). α=β/1-β
Answer: α= β/1+ β
12. The base- emitter voltage of 250 mV is applied to a transistor in common emitter configuration. If the base current is 150µA, then the input impedance is
(a). 1.66 kΩ
(b). 7.68kΩ
(c). 2 kΩ
(d). 4 kΩ
Answer: 1.66 kΩ
13. The velocity of light is
(a). greater in denser medium
(b). Greater in rarer medium
(c). Independent of the medium
(d). Zero in the vacuum
Answer: Greater in rarer medium.
14. When a vehicle passes, TV reception gets distorted due to
(a). Spark plug creating electromagnetic disturbances
(b). Metal reflecting radio waves
(c). Passing vehicle affecting TV components
(d). Use of electronic ignition system
Answer: Spark plug creating electromagnetic disturbances
15. If the velocity of light in vacuum is c m/s, then the velocity of light in a medium of refractive index 1.6 is
(a). 1.6 cm/sec
(b). C/1.6 m/sec
(c). 1.6/c m/sec
(d). C m/sec
Answer: c/1.6 m/sec
16. When a monochromatic beam of light passes from a denser medium into a rarer medium, it's
(a). Velocity decreases
(b). Velocity increases
(c). Frequency decreases
(d). Wavelength decreases
Answer: velocity increases
17. The common emitter circuit has
(a). low input impedance and high power gain
(b). high input impedance and high power gain
(c). high input impedance and low power gain
(d). low input impedance and low power gain
Answer: high input impedance and high power gain
18. In which of the following media, the velocity of light is maximum?
(a). Water
(b). Glass
(c). Air
(d). Salt water
Answer: air
19. In a common base transistor circuit, the ratio of variation of collector current to the corresponding variation of emitter current at constant collector to base potential is
(a). current gain
(b). input impedance
(c). output impedance
(d). voltage amplification factor
Answer: current gain
20. The unit of capacitance is
(a). Henry
(b). Ohm
(c). Farad
(d). Ampere
Answer: Option-C
21. Which one of the following is not electromagnetic wave?
(a). Gamma rays
(b). X-rays
(c). Beta rays
(d). Microwaves
Answer: Beta rays
22. In N-type semiconductor, the majority carriers of charge are
(a). holes
(b). electrons
(c). electrons and holes
(d). neutrons
Answer: electrons
23. A beaker is completely filled with hot water. It takes t 1 seconds to cool from 80°C to 75°C t2 seconds to cool from 75°C to 70°C
t3 seconds to cool from 70°C to 65°C then
(a). t1=t2=t3
(b).t1<t2=t3
(c).t1<t2<t3
(d) t1>t2>t3
Answer: t1<t2<t3
24. The number of images formed by an object kept between two parallel mirrors is:
(a). One
(b).Zero
(c). Infinity
(d).Three
Answer: Infinity
25. Devices such as hydraulic lift and hydraulic brakes are based on_____________
A:-Pascal´s law
B:-Hooke’s law
C:-Bernoulli’s theorem
D:-Archimedes principle
Correct Answer:- Option-A
26. Nuclear force is
a. charge dependent
b. spin independent
c. both charge and spin independent
d. spin dependent but charge independent
Ans: d
a. charge dependent
b. spin independent
c. both charge and spin independent
d. spin dependent but charge independent
Ans: d
27. The temperature at which solid and liquid state of the substance is in thermal equilibrium with each other is called________________
A:-Boiling point
B:-Latent specific heat
C:-Melting point
D:-Convection
Correct Answer:- Option-C
28. Time period of a simple harmonic motion depends on_______________________
A:-Amplitude of motion
B:-Energy
C:-Mass of the pendulum
D:-Length of the pendulum
Correct Answer:- Option-D
A:-Boiling point
B:-Latent specific heat
C:-Melting point
D:-Convection
Correct Answer:- Option-C
28. Time period of a simple harmonic motion depends on_______________________
A:-Amplitude of motion
B:-Energy
C:-Mass of the pendulum
D:-Length of the pendulum
Correct Answer:- Option-D
29. Some solid substance when heated changes from solid state to vapor state without passing through liquid state. This phenomenon is____________________
A:-Distillation
B:-Sublimation
C:-Differential extraction
D:-Vaporisation
Correct Answer:- Option-B
30. At the transmitter, information contained in the low frequency message signal is superimposed on a high frequency wave which acts as the carrier of the information. This process is called__________
A:-Amplification
B:-Attenuation
C:-Modulation
D:-Transmittance
Correct Answer:- Option-C
31. When three resistances of 5Ω, 10Ω, 20Ω are connected in parallel, the combined resistance will be___________________
A:-35Ω
B:-20Ω
C:-5Ω
D:-less than 5Ω
Correct Answer:- Option-D
A:-Distillation
B:-Sublimation
C:-Differential extraction
D:-Vaporisation
Correct Answer:- Option-B
30. At the transmitter, information contained in the low frequency message signal is superimposed on a high frequency wave which acts as the carrier of the information. This process is called__________
A:-Amplification
B:-Attenuation
C:-Modulation
D:-Transmittance
Correct Answer:- Option-C
31. When three resistances of 5Ω, 10Ω, 20Ω are connected in parallel, the combined resistance will be___________________
A:-35Ω
B:-20Ω
C:-5Ω
D:-less than 5Ω
Correct Answer:- Option-D
32. The homogenity of time leads to the law of conservation of
A:-linear momentum
B:-angular momentum
C:-energy
D:-charge
Correct Answer:- Option-C
33. Van der Pol equation d²x/dt² - ε(1-x²)dx/dt + x=0 (with non zero ε ) is an example of
A:-Linear conservative system
B:-Non linear conservative system
C:-Non linear non conservative system
D:-None of the above.
Correct Answer:- Option-C
34. The first integrals of motion of a system under central force are
A:-Linear momentum and energy
B:-Linear and angular momentum
C:-Angular momentum and energy
D:-Linear momentum, angular momentum and energy
Correct Answer:- Option-C
35. For a relativistic particle, the product of particle velocity and phase velocity of the associated de-Broglie wave is
A:-c²
B:-c
C:-2c
D:-2c²
Correct Answer:- Option-A
36. Constraint in a rigid body is
A:-non holonomic and rheonomic
B:-holonomic and rheonomic
C:-non holonomic and schleronomic
D:-holonomic and schleronomic
Correct Answer:- Option-D
37. If generalized coordinate has the dimension of velocity, then corresponding generalized velocity has the dimension of
A:-force
B:-displacement
C:-velocity
D:-acceleration
Correct Answer:- Option-D
38. A particle of rest mass energy of 8MeV is moving with energy 10 MeV. Find momentum of the particle in MeV/c
A:-8 MeV/c
B:-10 MeV/c
C:-6 MeV/c
D:-5 MeV/c
Correct Answer:- Option-C
39. A particle is moving in an inverse square force field. If the total energy of the particle is positive, then the trajectory of the particle will be
A:-hyperbolic
B:-elliptical
C:-parabolic
D:-circular
Correct Answer:- Option-A
40. For a system of two identical particles, each of which can be in one of n quantum states. Then number of antisymmetric states of the system is
A:-n(n + 1)/2
B:-n(n-1)
C:-n(n − 1)/2
D:-n(n+1)
Correct Answer:- Option-C
41. Dirac's relativistic quantum theory leads to the discovery of which particle?
A:-Neutrino
B:-Electron
C:-Positron
D:-Neutron
Correct Answer:- Option-C
42. Pauli's exclusion principle is obeyed by
A:-Photons
B:-Bosons
C:-Electrons
D:-Gravitons
Correct Answer:- Option-C
43. A charge Q is placed at the centre of a cube of side L. The flux of the electric field through the six surfaces of the cube is
A:-Q/(6ε0)
B:- Q/ε0
C:-Q/6L2
D:-Q/3L2
Correct Answer:- Option-B
44. Two electron beams moving parallel in the same direction will
A:-attract each other
B:-repel each other
C:-no change will be there
D:-attract and repel alternatively
Correct Answer:- Option-A
45. For an isotropic dielectric media, the relative permitivity is a
A:-scalar quantity
B:-vector quantity
C:-Tensor quantity
D:-none of the above
Correct Answer:- Option-A
46. The efficiency of a Carnot engine whose temperature of sink is 10 degree centigrade is 50%. By how much should the temperature of the source be increased so as to increase the efficiency of the engine to
A:-377K
B:-377 degree C
C:-943K
D:-943 degree C
Correct Answer:- Option-A
47. Two spherical vessels contain equal quantities of air. One is at a temperature of 70 degree C and its internal radius is 7cm with pressure P. The other vessel is at temperature 239 degree C and its internal pressure P1. The pressure exerted by air inside them satisfy which of the following relation
A:-P1= 2P
B:-P1= 3P
C:-P1= P
D:-P1= 4P
Correct Answer:- Option-C
48. A system consists of 10,000 atoms and is at 300K. Assuming there is no inter atomic energy in the system, its total energy will be
A:-12.4 KJ
B:-12.4 J
C:-6.21 KJ
D:-6.21 J
Correct Answer:- Option-C
49. Consider the system of four identical particles each of which can be in any one of five single particle states. Then the accessible number of states of the system according to Bose-Einstein statistics is
A:-24
B:-50
C:-32
D:-70
Correct Answer:- Option-D
50. The fermi energy for a metal is 4.7 eV. What is its value for another metal which has the free electron density 27 times that of the former?
A:-42.3 eV
B:-9 eV
C:-27 eV
D:-18.2 eV
Correct Answer:- Option-A
51. When the electron jumps from the fourth orbit to the second orbit, one gets
A:-first line of Balmer series
B:-second line of Lyman series
C:-second line of Paschen series
D:-second line of Balmer series
Correct Answer:- Option-D
52. The maximum number of electrons in a subshell with orbital quantum number l is
A:-(2l+1)
B:-(2l-1)
C:-2(2l+1)
D:-2(2l-1)
Correct Answer:- Option-C
53. The L,S and J quantum numbers corresponding to the ground state electonic configuration of Boron (Z=5) are
A:-L=1, S=1/2, J=3/2
B:-L=1, S=1/2, J=1/2
C:-L=1, S=3/2, J=1/2
D:-L=0, S=1/2, J=3/2
Correct Answer:- Option-B
54. Which one of the following molecules does not exhbit a rotational spectrum
A:-H2
B:-CO
C:-HCl
D:-HBr
Correct Answer:- Option-A
55. A hexagonal structure has a symmetry element
A:-One 6-fold rotation axis
B:-Two 3-fold rotation axis
C:-Three 2-fold rotation axis
D:-A 4-fold rotation- inversion axis
Correct Answer:- Option-A
56. Packing fraction for a simple cubic lattice as comapred to that of fcc lattice is
A:-greater
B:-smaller
C:-can be greater or smaller
D:-not possible to say
Correct Answer:- Option-B
57. When irradiated with visible light, which of the following types of solids are always opaque ?
A:-ionic crystals
B:-covalent solids
C:-metallic solids
D:-none of these
Correct Answer:- Option-C
58. Eistein's theory concludes that at lower temperatures the specific heat
A:-drops linearly with increase of temperature
B:-drops linearly with decrease of temperature
C:-drops exponentially with decrease of temperature
D:-remains constant
Correct Answer:- Option-C
59. For a conventional superconductor, which of the following statement is NOT true?
A:-specific heat is discontinuous at transition temperature Tc
B:-The resistivity falls sharply at Tc
C:-It is diamagnetic below Tc
D:-It is paramagnetic below Tc
Correct Answer:- Option-D
60. Half life of a radioactive sample is 365 days. Its mean life is then
A:-50.67 days
B:-5543.32 days
C:-526.87 days
D:-None of these
Correct Answer:- Option-C
61. Which of the following is true?
A:-Quarks do not have colour
B:-Photons have colour
C:-Leptons do not have colour
D:-None of these
Correct Answer:- Option-C
62. A 4-bit D/A converter produces an output voltage of 4.5V for an input code of 1001. Its output voltage for an input code 0011 will be:
A:-0.5V
B:-2.25V
C:-1.5V
D:-2.75V
Correct Answer:- Option-C
63. Nano tubes are structures with confinement in
A:-2 dimensions
B:-3 dimensions
C:-1 dimensions
D:-zero dimension
Correct Answer:- Option-A
64. Unique properties of nano materials can be ascribed to
A:-large surface to volume ratio
B:-quantum confinement effect
C:-phonon confinement
D:-all of the above
Correct Answer:- Option-D
65. CNT can be metallic if the chiral vector (n,m)
A:-n-m = ½
B:-(n-m)/3 is not an integer
C:-n-m= 0
D:-n-m = ¼
Correct Answer:- Option-C
66. An example of top down approach in nano technology is
A:-sputtering
B:-vapour deposition
C:-sol gel technique
D:-milling
Correct Answer:- Option-D
67. Ballistic quantum conductance is related to
A:-Space technology
B:-CNT
C:-IC technology
D:-FET
Correct Answer:- Option-B
68. An important feature of Big Bang cosmology that is supported by observational astronomy is that the universe
A:-is increasing its total mass over time
B:-is expanding at an accelerating rate
C:-is formed from an earlier collapsed universe
D:-contains a great deal of dark matter
Correct Answer:- Option-B
69. Pulsars are stars that give off precisely spaced bursts of radiation. Which of the following is responsible for this phenomenon?
A:-The strong magnetic field of a neutron star causes it to emit radiation in two narrow beams that sweep by Earth as the star spins
B:-The presence of a neutron star orbiting very close to the pulsar causes a recurring increase in the pulsar's energy output.
C:-The buildup and collapse of a neutron star's magnetic field repels and attracts ionized gases on the star's surface.
D:-The low mass of a pulsar produces alternating cycles of nuclear fusion and chemical burning that release different amounts of energy.
Correct Answer:- Option-A
70. In a typical H-R diagram, stars are graphed by these two characteristics
A:-Distance and temperature
B:-Luminosity and distance
C:-Temperature and luminosity
D:-Size and distance
Correct Answer:- Option-C
71. Which of the following appliances use solar photovoltaic technology?
A:-Solar lantern
B:-Solar water heater
C:-Solar air heater
D:-all of the above
Correct Answer:- Option-A
72. The value of solar constant is approximately
A:-65 kW/m²
B:-1.36 kW/m²
C:-364 kW/m²
D:-10 kW/m²
Correct Answer:- Option-B
A:-linear momentum
B:-angular momentum
C:-energy
D:-charge
Correct Answer:- Option-C
33. Van der Pol equation d²x/dt² - ε(1-x²)dx/dt + x=0 (with non zero ε ) is an example of
A:-Linear conservative system
B:-Non linear conservative system
C:-Non linear non conservative system
D:-None of the above.
Correct Answer:- Option-C
34. The first integrals of motion of a system under central force are
A:-Linear momentum and energy
B:-Linear and angular momentum
C:-Angular momentum and energy
D:-Linear momentum, angular momentum and energy
Correct Answer:- Option-C
35. For a relativistic particle, the product of particle velocity and phase velocity of the associated de-Broglie wave is
A:-c²
B:-c
C:-2c
D:-2c²
Correct Answer:- Option-A
36. Constraint in a rigid body is
A:-non holonomic and rheonomic
B:-holonomic and rheonomic
C:-non holonomic and schleronomic
D:-holonomic and schleronomic
Correct Answer:- Option-D
37. If generalized coordinate has the dimension of velocity, then corresponding generalized velocity has the dimension of
A:-force
B:-displacement
C:-velocity
D:-acceleration
Correct Answer:- Option-D
38. A particle of rest mass energy of 8MeV is moving with energy 10 MeV. Find momentum of the particle in MeV/c
A:-8 MeV/c
B:-10 MeV/c
C:-6 MeV/c
D:-5 MeV/c
Correct Answer:- Option-C
39. A particle is moving in an inverse square force field. If the total energy of the particle is positive, then the trajectory of the particle will be
A:-hyperbolic
B:-elliptical
C:-parabolic
D:-circular
Correct Answer:- Option-A
40. For a system of two identical particles, each of which can be in one of n quantum states. Then number of antisymmetric states of the system is
A:-n(n + 1)/2
B:-n(n-1)
C:-n(n − 1)/2
D:-n(n+1)
Correct Answer:- Option-C
41. Dirac's relativistic quantum theory leads to the discovery of which particle?
A:-Neutrino
B:-Electron
C:-Positron
D:-Neutron
Correct Answer:- Option-C
42. Pauli's exclusion principle is obeyed by
A:-Photons
B:-Bosons
C:-Electrons
D:-Gravitons
Correct Answer:- Option-C
43. A charge Q is placed at the centre of a cube of side L. The flux of the electric field through the six surfaces of the cube is
A:-Q/(6ε0)
B:- Q/ε0
C:-Q/6L2
D:-Q/3L2
Correct Answer:- Option-B
44. Two electron beams moving parallel in the same direction will
A:-attract each other
B:-repel each other
C:-no change will be there
D:-attract and repel alternatively
Correct Answer:- Option-A
45. For an isotropic dielectric media, the relative permitivity is a
A:-scalar quantity
B:-vector quantity
C:-Tensor quantity
D:-none of the above
Correct Answer:- Option-A
46. The efficiency of a Carnot engine whose temperature of sink is 10 degree centigrade is 50%. By how much should the temperature of the source be increased so as to increase the efficiency of the engine to
A:-377K
B:-377 degree C
C:-943K
D:-943 degree C
Correct Answer:- Option-A
47. Two spherical vessels contain equal quantities of air. One is at a temperature of 70 degree C and its internal radius is 7cm with pressure P. The other vessel is at temperature 239 degree C and its internal pressure P1. The pressure exerted by air inside them satisfy which of the following relation
A:-P1= 2P
B:-P1= 3P
C:-P1= P
D:-P1= 4P
Correct Answer:- Option-C
48. A system consists of 10,000 atoms and is at 300K. Assuming there is no inter atomic energy in the system, its total energy will be
A:-12.4 KJ
B:-12.4 J
C:-6.21 KJ
D:-6.21 J
Correct Answer:- Option-C
49. Consider the system of four identical particles each of which can be in any one of five single particle states. Then the accessible number of states of the system according to Bose-Einstein statistics is
A:-24
B:-50
C:-32
D:-70
Correct Answer:- Option-D
50. The fermi energy for a metal is 4.7 eV. What is its value for another metal which has the free electron density 27 times that of the former?
A:-42.3 eV
B:-9 eV
C:-27 eV
D:-18.2 eV
Correct Answer:- Option-A
51. When the electron jumps from the fourth orbit to the second orbit, one gets
A:-first line of Balmer series
B:-second line of Lyman series
C:-second line of Paschen series
D:-second line of Balmer series
Correct Answer:- Option-D
52. The maximum number of electrons in a subshell with orbital quantum number l is
A:-(2l+1)
B:-(2l-1)
C:-2(2l+1)
D:-2(2l-1)
Correct Answer:- Option-C
53. The L,S and J quantum numbers corresponding to the ground state electonic configuration of Boron (Z=5) are
A:-L=1, S=1/2, J=3/2
B:-L=1, S=1/2, J=1/2
C:-L=1, S=3/2, J=1/2
D:-L=0, S=1/2, J=3/2
Correct Answer:- Option-B
54. Which one of the following molecules does not exhbit a rotational spectrum
A:-H2
B:-CO
C:-HCl
D:-HBr
Correct Answer:- Option-A
55. A hexagonal structure has a symmetry element
A:-One 6-fold rotation axis
B:-Two 3-fold rotation axis
C:-Three 2-fold rotation axis
D:-A 4-fold rotation- inversion axis
Correct Answer:- Option-A
56. Packing fraction for a simple cubic lattice as comapred to that of fcc lattice is
A:-greater
B:-smaller
C:-can be greater or smaller
D:-not possible to say
Correct Answer:- Option-B
57. When irradiated with visible light, which of the following types of solids are always opaque ?
A:-ionic crystals
B:-covalent solids
C:-metallic solids
D:-none of these
Correct Answer:- Option-C
58. Eistein's theory concludes that at lower temperatures the specific heat
A:-drops linearly with increase of temperature
B:-drops linearly with decrease of temperature
C:-drops exponentially with decrease of temperature
D:-remains constant
Correct Answer:- Option-C
59. For a conventional superconductor, which of the following statement is NOT true?
A:-specific heat is discontinuous at transition temperature Tc
B:-The resistivity falls sharply at Tc
C:-It is diamagnetic below Tc
D:-It is paramagnetic below Tc
Correct Answer:- Option-D
60. Half life of a radioactive sample is 365 days. Its mean life is then
A:-50.67 days
B:-5543.32 days
C:-526.87 days
D:-None of these
Correct Answer:- Option-C
61. Which of the following is true?
A:-Quarks do not have colour
B:-Photons have colour
C:-Leptons do not have colour
D:-None of these
Correct Answer:- Option-C
62. A 4-bit D/A converter produces an output voltage of 4.5V for an input code of 1001. Its output voltage for an input code 0011 will be:
A:-0.5V
B:-2.25V
C:-1.5V
D:-2.75V
Correct Answer:- Option-C
63. Nano tubes are structures with confinement in
A:-2 dimensions
B:-3 dimensions
C:-1 dimensions
D:-zero dimension
Correct Answer:- Option-A
64. Unique properties of nano materials can be ascribed to
A:-large surface to volume ratio
B:-quantum confinement effect
C:-phonon confinement
D:-all of the above
Correct Answer:- Option-D
65. CNT can be metallic if the chiral vector (n,m)
A:-n-m = ½
B:-(n-m)/3 is not an integer
C:-n-m= 0
D:-n-m = ¼
Correct Answer:- Option-C
66. An example of top down approach in nano technology is
A:-sputtering
B:-vapour deposition
C:-sol gel technique
D:-milling
Correct Answer:- Option-D
67. Ballistic quantum conductance is related to
A:-Space technology
B:-CNT
C:-IC technology
D:-FET
Correct Answer:- Option-B
68. An important feature of Big Bang cosmology that is supported by observational astronomy is that the universe
A:-is increasing its total mass over time
B:-is expanding at an accelerating rate
C:-is formed from an earlier collapsed universe
D:-contains a great deal of dark matter
Correct Answer:- Option-B
69. Pulsars are stars that give off precisely spaced bursts of radiation. Which of the following is responsible for this phenomenon?
A:-The strong magnetic field of a neutron star causes it to emit radiation in two narrow beams that sweep by Earth as the star spins
B:-The presence of a neutron star orbiting very close to the pulsar causes a recurring increase in the pulsar's energy output.
C:-The buildup and collapse of a neutron star's magnetic field repels and attracts ionized gases on the star's surface.
D:-The low mass of a pulsar produces alternating cycles of nuclear fusion and chemical burning that release different amounts of energy.
Correct Answer:- Option-A
70. In a typical H-R diagram, stars are graphed by these two characteristics
A:-Distance and temperature
B:-Luminosity and distance
C:-Temperature and luminosity
D:-Size and distance
Correct Answer:- Option-C
71. Which of the following appliances use solar photovoltaic technology?
A:-Solar lantern
B:-Solar water heater
C:-Solar air heater
D:-all of the above
Correct Answer:- Option-A
72. The value of solar constant is approximately
A:-65 kW/m²
B:-1.36 kW/m²
C:-364 kW/m²
D:-10 kW/m²
Correct Answer:- Option-B
73:-Which of the following is a scalar quantity ?
A:-force
B:-work
C:-acceleration
D:-velocity
Ans: B
74:-The colour in the outer arc of a primary rainbow is
A:-violet
B:-blue
C:-green
D:-red
Ans: D
75:-SI unit of electric current is
A:-newton
B:-pascal
C:-ampere
D:-volt
Ans: C
76:-According to Ohm's law, the relation between resistance (R), current (I) and potential difference (V) is
A:-R = V/I
B:-R = VI
C:-R = I/V
D:-none of these
Ans: A
77:-The statement of Newton's second law is
A:-For every action there is equal and opposite reaction
B:-The rate of change of momentum of a body is directly proportional to the external force acting on it.
C:-Everybody continues the state of rest or uniform motion in the absence of force.
D:-Everybody in the universe attract all other bodies with a force which is directly proportional to their masses and inversely proportional to the square of the distance between them
Ans: B
78:-Which of the following device is used to reduce electric current in an a c circuit without reduction in power
A:-capacitor
B:-resistor
C:-inductor
D:-a c generator
Ans: C
79:-If a radioactive nucleus emits an alpha particle,
A:-its atomic number increases by one and mass number decreases by 0ne.
B:-its atomic number increases by one and mass number remains the same
C:-its atomic number decreases by two and mass number decreases by four
D:-its atomic number decreases by four and mass number decreases by two
Ans: C
80:-The reason for the blue colour of the ocean is
A:-scattering
B:-interference
C:-reflection
D:-diffraction
Ans: A
81:-Which of the following can be used to make rectifier
A:-p n p transistor
B:-n p n transistor
C:-resistor
D:-p n junction diode
Ans: D
82:-The focal length of a convex lens is 25 cm. Then its power is
A:-4D
B:-3D
C:-2D
D:-1D
Ans: A
A:-force
B:-work
C:-acceleration
D:-velocity
Ans: B
74:-The colour in the outer arc of a primary rainbow is
A:-violet
B:-blue
C:-green
D:-red
Ans: D
75:-SI unit of electric current is
A:-newton
B:-pascal
C:-ampere
D:-volt
Ans: C
76:-According to Ohm's law, the relation between resistance (R), current (I) and potential difference (V) is
A:-R = V/I
B:-R = VI
C:-R = I/V
D:-none of these
Ans: A
77:-The statement of Newton's second law is
A:-For every action there is equal and opposite reaction
B:-The rate of change of momentum of a body is directly proportional to the external force acting on it.
C:-Everybody continues the state of rest or uniform motion in the absence of force.
D:-Everybody in the universe attract all other bodies with a force which is directly proportional to their masses and inversely proportional to the square of the distance between them
Ans: B
78:-Which of the following device is used to reduce electric current in an a c circuit without reduction in power
A:-capacitor
B:-resistor
C:-inductor
D:-a c generator
Ans: C
79:-If a radioactive nucleus emits an alpha particle,
A:-its atomic number increases by one and mass number decreases by 0ne.
B:-its atomic number increases by one and mass number remains the same
C:-its atomic number decreases by two and mass number decreases by four
D:-its atomic number decreases by four and mass number decreases by two
Ans: C
80:-The reason for the blue colour of the ocean is
A:-scattering
B:-interference
C:-reflection
D:-diffraction
Ans: A
81:-Which of the following can be used to make rectifier
A:-p n p transistor
B:-n p n transistor
C:-resistor
D:-p n junction diode
Ans: D
82:-The focal length of a convex lens is 25 cm. Then its power is
A:-4D
B:-3D
C:-2D
D:-1D
Ans: A
83:-The temperature at which second virial coefficient of a gas is zero is
A:-Boyle temperature
B:-Critical temperature
C:-Boiling point
D:-Critical temperature
Ans: A
84:-A crystal having unit cell dimensions, `a` `!=` `b` `!=` `c` , `alpha` `=` `beta` `=` `Gamma``=` 90° is
A:-Cubic
B:-Tetragonal
C:-Orthorhombic
D:-Monoclinic
Ans: C
85:-Wavelength corresponding to maximum energy is inversely proportional to temperature. The law is
A:-Wein displacement law
B:-Stefan's law
C:-Boltzmann law
D:-Rayleigh Jean's law
Ans: A
86:-NQR is observed in the region
A:-UV-Visible
B:-X-ray
C:-Microwave
D:-Radiofrequency
Ans: D
87:-The ground term symbol of Lithinum atom
A:-`1_S_0`
B:-`2_S__(1/2)`
C:-`2_S_1`
D:-`3_S_1`
Ans: B
88:-Optical rotation and circular dichroism together are known as
A:-Cotton effect
B:-ORD
C:-Frank Condon principle
D:-Stark effect
Ans: A
89:-The intensity of rotational spectral line depends on
A:-Relative population of rotational levels
B:-Degeneracy of rotational level
C:-Both 1 and 2
D:-None of these
Ans: C
90:-Symmetric top molecules have
A:-Two moments of inertia equal and third different
B:-All the three moments of inertia equal
C:-All the three moments of inertia different
D:-None of these
Ans: A
91:-The vibrating stretching frequency of a diatomic molecule depends on
A:-Force constant
B:-Masses of two atoms
C:-Both 1 and 2
D:-None of these
Ans: C
92:-Identify the spectra corresponds to the frequency 15000 `cm^-1`
A:-Visible
B:-IR
C:-NMR
D:-Microwave
Ans: A
93:-Raman lines on the low frequency side of the excitation frequency are called
A:-Stokes lines
B:-Antistokes lines
C:-Rayleigh line
D:-None of these
Ans: A
94:-The shift of an absorption maximum towards longer wavelength is known as
A:-Hypsochromic effect
B:-Bathochromic effect
C:-Hyperchromic effect
D:-Hypochromic effect
Ans: B
95:-In Mossbauer spectroscopy, the main hyperfine interaction/s is/are
A:-Isomer shift
B:-Quadrupole splitting
C:-Nuclear Zeeman splitting
D:-All
Ans: D
A:-Boyle temperature
B:-Critical temperature
C:-Boiling point
D:-Critical temperature
Ans: A
84:-A crystal having unit cell dimensions, `a` `!=` `b` `!=` `c` , `alpha` `=` `beta` `=` `Gamma``=` 90° is
A:-Cubic
B:-Tetragonal
C:-Orthorhombic
D:-Monoclinic
Ans: C
85:-Wavelength corresponding to maximum energy is inversely proportional to temperature. The law is
A:-Wein displacement law
B:-Stefan's law
C:-Boltzmann law
D:-Rayleigh Jean's law
Ans: A
86:-NQR is observed in the region
A:-UV-Visible
B:-X-ray
C:-Microwave
D:-Radiofrequency
Ans: D
87:-The ground term symbol of Lithinum atom
A:-`1_S_0`
B:-`2_S__(1/2)`
C:-`2_S_1`
D:-`3_S_1`
Ans: B
88:-Optical rotation and circular dichroism together are known as
A:-Cotton effect
B:-ORD
C:-Frank Condon principle
D:-Stark effect
Ans: A
89:-The intensity of rotational spectral line depends on
A:-Relative population of rotational levels
B:-Degeneracy of rotational level
C:-Both 1 and 2
D:-None of these
Ans: C
90:-Symmetric top molecules have
A:-Two moments of inertia equal and third different
B:-All the three moments of inertia equal
C:-All the three moments of inertia different
D:-None of these
Ans: A
91:-The vibrating stretching frequency of a diatomic molecule depends on
A:-Force constant
B:-Masses of two atoms
C:-Both 1 and 2
D:-None of these
Ans: C
92:-Identify the spectra corresponds to the frequency 15000 `cm^-1`
A:-Visible
B:-IR
C:-NMR
D:-Microwave
Ans: A
93:-Raman lines on the low frequency side of the excitation frequency are called
A:-Stokes lines
B:-Antistokes lines
C:-Rayleigh line
D:-None of these
Ans: A
94:-The shift of an absorption maximum towards longer wavelength is known as
A:-Hypsochromic effect
B:-Bathochromic effect
C:-Hyperchromic effect
D:-Hypochromic effect
Ans: B
95:-In Mossbauer spectroscopy, the main hyperfine interaction/s is/are
A:-Isomer shift
B:-Quadrupole splitting
C:-Nuclear Zeeman splitting
D:-All
Ans: D
96:-Which of the following combination will give an effective resistance of 4Ω, if three resistances of values 2Ω, 3Ω and 6Ω are available?
A:-Parallel combination of 2Ω and 6Ω resistance in series with 3Ω resistance
B:-Parallel combination of 2Ω and 3Ω resistance in series with 6Ω resistance
C:-All the three resistances in parallel
D:-Parallel combination of 3Ω and 6Ω resistance in series with 2Ω resistance
Ans: D
97:-An ohmmeter indicates zero ohms when connected across an inductor. The inductor is
A:-Open
B:-Good
C:-Partly opened
D:-Shorted
Ans: D
98:-To increase the amount of current in a resistor from 60 mA to 80 mA by changing the 12V source, what should the new voltage setting be?
A:-4V
B:-1.6V
C:-16V
D:-40V
Ans: C
99:-The resistance of earth wire should be
A:-Very low
B:-High
C:-Reasonable
D:-Infinite
Ans: A
100:-A series RLC circuit with XL = 25 ohm, XC = 35 ohm, and R = 10 ohm carries an effective current of 5 A. Calculate the power dissipated in watts of a series RLC circuit
A:-50
B:-250
C:-300
D:-550
Ans: B
A:-Parallel combination of 2Ω and 6Ω resistance in series with 3Ω resistance
B:-Parallel combination of 2Ω and 3Ω resistance in series with 6Ω resistance
C:-All the three resistances in parallel
D:-Parallel combination of 3Ω and 6Ω resistance in series with 2Ω resistance
Ans: D
97:-An ohmmeter indicates zero ohms when connected across an inductor. The inductor is
A:-Open
B:-Good
C:-Partly opened
D:-Shorted
Ans: D
98:-To increase the amount of current in a resistor from 60 mA to 80 mA by changing the 12V source, what should the new voltage setting be?
A:-4V
B:-1.6V
C:-16V
D:-40V
Ans: C
99:-The resistance of earth wire should be
A:-Very low
B:-High
C:-Reasonable
D:-Infinite
Ans: A
100:-A series RLC circuit with XL = 25 ohm, XC = 35 ohm, and R = 10 ohm carries an effective current of 5 A. Calculate the power dissipated in watts of a series RLC circuit
A:-50
B:-250
C:-300
D:-550
Ans: B