PHYSICS- PAGE 5
1. The power factor of a series LCR circuit at resonance is (assuming resistance of inductance to be zero)
1) Zero
2) One
3) between zero and one
4) between one and infinity
Ans: 2
2. An air core coil and an electric bulb are connected in series with an ac source . If an iron rod is put in the coil , then the intensity of the bulb will :
1) remain same
2) increase
3) decrease
4) become zero
Ans: 3
3. What should be the percentage increase in the impedence of an ac circuit so as to reduce power factor from 1/2 to 1/4 ?
1) 25%
2) 50%
3) 100%
4) 200%
Ans: 3
4. A wire of length L is given the shape of a circular ring and current I is flowing through it. Now if it is given the
shape of a coil having 2 turns and the same value of current flows through it, then the ratio of magnetic field
at the centre in first and second case will be :
1) 1/4
2) 1/2
3) 2
4) 4
Ans: 1
5. Which of the following is NOT true for common collector configuration of a BJT.
1) Input impedence is Low
2) Current gain is high
3) Voltage gain is less then 1
4) used for impedence matching
Ans: 1
6. Binary equivalent number of 109 is :
1) 1110101
2) 1101101
3) 1111111
4) 1111101
Ans: 2
7. Using Boolean algebra , the simple form of (A + B) (A + C ) is :
1) A + BC
2) B + AC
3) C + AB
4) A + B
Ans: 1
8. For an amplifier voltage gain is 500 and after feedback it reduces to 100 , then the feedback ratio is :
1) 0.008
2) 0.008
3) 0.011
4) 0.011
Ans: 2
9. A flip flop can exist in the following number of states :
1) One
2) Three
3) Two
4) Four
Ans: 3
10. Atomic spectrum of Ca would have :
1) Only singlet lines
2) Only doublet lines
3) Singlet and doublet lines
4) Singlet and triplet lines
Ans: 4
11. Paschen Back effect on atomic energy levels is caused by :
1) A strong electric field
2) Small magnetic fields such that effect of spin orbit interaction is large compared to the effect of magnetic field
3) High magnetic fields such that effect of spin orbit interaction is small compared to the effect of magnetic field
4) Any magnetic field irrespective of the magnitude of spin orbit interaction
Ans: 3
12. Choose correct statement for frequency difference as one goes to higher frequency in the vibrational spectrum of a diatomic molecule:
1) It stays constant
2) It increases
3) It decreases
4) It initially increases but then decreases
Ans: 3
13. In Stern Gerlach experiment as atoms moving along x direction enter in the region between magnetic poles, the magnetic field must :
1) be constant
2) have a gradient along xdirection
3) have a gradient in the perpendicular direction
4) be oscillating with time
Ans: 3
14. Lead which is a type I superconductor , has a superconducting transition temperature of about 7 K. At 3.5K, respective values of its resistivity and magnetic susceptibility would be :
1) 0 , 0
2) 0, (-)1
3) 0, 1
4) 0 , (-)0.5
Ans: 2
15. Curie temperature of iron is 1043 K but a block of iron extracted from a mine does not attract an iron nail at room temperature . This is because :
1) of multi magnetic domain structure in ferromagnetic iron
2) iron extracted from mine continues to be paramagnetic at room temperature
3) iron extracted from mine is in diamagnetic state at room temperature
4) more than of one the mentioned factors
Ans: 1
16. A Type II superconductor is characterized by value of London penetration depth to coherence length being :
1) 0
2) 1
3) less than 1
4) more than 1
Ans: 4
17. Consider an arrangement of two metal blocks with a layer of an insulating material in between them. Choose
incorrect statement :
1) As a voltage is applied across the junction , current changes linearly with voltage .
2) If the two metals are brought in superconducting state , then even without applying any potential across the
junction , a dc current will flow across the junction
3) An oscillatory current will flow , if a DC voltage is applied across the junction
4) An oscillatory current will flow , only if an AC voltage is applied across the junction
Ans: 3
18. What is called the study and use of sound waves?
A:-Vocal pedagogy
B:-Acoustics
C:-Audiometry
D:-Audiology
Correct Answer:- Option-B
1) Zero
2) One
3) between zero and one
4) between one and infinity
Ans: 2
2. An air core coil and an electric bulb are connected in series with an ac source . If an iron rod is put in the coil , then the intensity of the bulb will :
1) remain same
2) increase
3) decrease
4) become zero
Ans: 3
3. What should be the percentage increase in the impedence of an ac circuit so as to reduce power factor from 1/2 to 1/4 ?
1) 25%
2) 50%
3) 100%
4) 200%
Ans: 3
4. A wire of length L is given the shape of a circular ring and current I is flowing through it. Now if it is given the
shape of a coil having 2 turns and the same value of current flows through it, then the ratio of magnetic field
at the centre in first and second case will be :
1) 1/4
2) 1/2
3) 2
4) 4
Ans: 1
5. Which of the following is NOT true for common collector configuration of a BJT.
1) Input impedence is Low
2) Current gain is high
3) Voltage gain is less then 1
4) used for impedence matching
Ans: 1
6. Binary equivalent number of 109 is :
1) 1110101
2) 1101101
3) 1111111
4) 1111101
Ans: 2
7. Using Boolean algebra , the simple form of (A + B) (A + C ) is :
1) A + BC
2) B + AC
3) C + AB
4) A + B
Ans: 1
8. For an amplifier voltage gain is 500 and after feedback it reduces to 100 , then the feedback ratio is :
1) 0.008
2) 0.008
3) 0.011
4) 0.011
Ans: 2
9. A flip flop can exist in the following number of states :
1) One
2) Three
3) Two
4) Four
Ans: 3
10. Atomic spectrum of Ca would have :
1) Only singlet lines
2) Only doublet lines
3) Singlet and doublet lines
4) Singlet and triplet lines
Ans: 4
11. Paschen Back effect on atomic energy levels is caused by :
1) A strong electric field
2) Small magnetic fields such that effect of spin orbit interaction is large compared to the effect of magnetic field
3) High magnetic fields such that effect of spin orbit interaction is small compared to the effect of magnetic field
4) Any magnetic field irrespective of the magnitude of spin orbit interaction
Ans: 3
12. Choose correct statement for frequency difference as one goes to higher frequency in the vibrational spectrum of a diatomic molecule:
1) It stays constant
2) It increases
3) It decreases
4) It initially increases but then decreases
Ans: 3
13. In Stern Gerlach experiment as atoms moving along x direction enter in the region between magnetic poles, the magnetic field must :
1) be constant
2) have a gradient along xdirection
3) have a gradient in the perpendicular direction
4) be oscillating with time
Ans: 3
14. Lead which is a type I superconductor , has a superconducting transition temperature of about 7 K. At 3.5K, respective values of its resistivity and magnetic susceptibility would be :
1) 0 , 0
2) 0, (-)1
3) 0, 1
4) 0 , (-)0.5
Ans: 2
15. Curie temperature of iron is 1043 K but a block of iron extracted from a mine does not attract an iron nail at room temperature . This is because :
1) of multi magnetic domain structure in ferromagnetic iron
2) iron extracted from mine continues to be paramagnetic at room temperature
3) iron extracted from mine is in diamagnetic state at room temperature
4) more than of one the mentioned factors
Ans: 1
16. A Type II superconductor is characterized by value of London penetration depth to coherence length being :
1) 0
2) 1
3) less than 1
4) more than 1
Ans: 4
17. Consider an arrangement of two metal blocks with a layer of an insulating material in between them. Choose
incorrect statement :
1) As a voltage is applied across the junction , current changes linearly with voltage .
2) If the two metals are brought in superconducting state , then even without applying any potential across the
junction , a dc current will flow across the junction
3) An oscillatory current will flow , if a DC voltage is applied across the junction
4) An oscillatory current will flow , only if an AC voltage is applied across the junction
Ans: 3
18. What is called the study and use of sound waves?
A:-Vocal pedagogy
B:-Acoustics
C:-Audiometry
D:-Audiology
Correct Answer:- Option-B
19:-When a resistance wire is stretched twice its lenght,its area of cross-section reduced by half.Then its resistance
A:-increases twice
B:-increases 4 times
C:-reduces to half
D:-no change
Ans: B
20:-In a p-type semiconductor, the majority carriers are
A:-electrons
B:-holes
C:-neutrons
D:-protons
Ans: B
21:-When a white light undergo dispersion through a triangular glass prism,the colour that deviates the most
A:-violet
B:-red
C:-indigo
D:-yellow
Ans: A
22:-When an explosion occurs 6800m away from a man, then how long after its sound reaches the man(speed of sound in air is 340 m/s)
A:- 2 s
B:-6.8 s
C:-3.4 s
D:-20 s
Ans: D
23:-Time taken by sunlight to reach the earth is approximately
A:-8½ minutes
B:-8½ seconds
C:-8½ hours
D:-8½ light years
Ans: A
24:-A transformer works on
A:-Self induction
B:-Joule's heating effect
C:-Maxwell's law
D:-Mutual induction
Ans: D
25:-Unit of electric power
A:-Volt
B:-Watt
C:-Ampere
D:-Newton
Ans: B
26:-Einstein's mass-energy relation is
A:-E=M/c2
B:-E=Mc2
C:-E=M2c
D:-E=Mc/2
Ans: B
27:-When a body is lifted from the surface of the earth,acceleration due to gravity(g) on it
A:-increases
B:-remains the same
C:-first increases and then decreases
D:-decreases
Ans: D
28:-During free fall of a body,its weight
A:-decreases
B:-increases
C:-no weight
D:-none of the above
Ans: C
A:-increases twice
B:-increases 4 times
C:-reduces to half
D:-no change
Ans: B
20:-In a p-type semiconductor, the majority carriers are
A:-electrons
B:-holes
C:-neutrons
D:-protons
Ans: B
21:-When a white light undergo dispersion through a triangular glass prism,the colour that deviates the most
A:-violet
B:-red
C:-indigo
D:-yellow
Ans: A
22:-When an explosion occurs 6800m away from a man, then how long after its sound reaches the man(speed of sound in air is 340 m/s)
A:- 2 s
B:-6.8 s
C:-3.4 s
D:-20 s
Ans: D
23:-Time taken by sunlight to reach the earth is approximately
A:-8½ minutes
B:-8½ seconds
C:-8½ hours
D:-8½ light years
Ans: A
24:-A transformer works on
A:-Self induction
B:-Joule's heating effect
C:-Maxwell's law
D:-Mutual induction
Ans: D
25:-Unit of electric power
A:-Volt
B:-Watt
C:-Ampere
D:-Newton
Ans: B
26:-Einstein's mass-energy relation is
A:-E=M/c2
B:-E=Mc2
C:-E=M2c
D:-E=Mc/2
Ans: B
27:-When a body is lifted from the surface of the earth,acceleration due to gravity(g) on it
A:-increases
B:-remains the same
C:-first increases and then decreases
D:-decreases
Ans: D
28:-During free fall of a body,its weight
A:-decreases
B:-increases
C:-no weight
D:-none of the above
Ans: C
29. Ohm’s Law states that :
(A) V=IR
(B) V=I/R
(C) I= R/V
(D) I=VR
Ans: A
30. Choose the odd one :
(A) Electromagnetic force (B) Gravitational force
(C) Strong nuclear force (D) Spring force
Ans: D
31. Earth magnetism is due to :
(A) Dynamo effect (B) Doppler effect (C) Solar effect (D) Magnus effect
Ans: A
32. Which principle is used to check the correctness of an equation ?
(A) Principle of Continuity (B) Principle of Parallax
(C) Principle of Conduction (D) Principle of Homogeneity
Ans: D
33. The acronym LASER stands for :
(A) Light Amplification by Stimulated Emission of Radiation.
(B) Light Attenuation by Stimulated Emission of Radiation.
(C) Large Amplification by Stimulated Emission of Radiation.
(D) Light Amplification by Slowed Emission of Radiation.
Ans: A
34. In a uniform circular motion :
(A) Velocity is constant (B) Distance is constant
(C) Displacement is constant (D) Speed is constant
Ans: D
35. The process of deliberate addition of desirable impurity in an intrinsic semiconductor is :
(A) Doping (B) Bonding (C) Diffusion (D) Sublimation
Ans: A
36. In 1921 Albert Einstein was awarded Nobel Prize in the study of :
(A) Black body Radiation (B) Photoelectric effect
(C) Mass-Energy Relation (D) Atom model
Ans: B
37. Henry is the unit of :
(A) Capacitance (B) Resistance (C) Inductance (D) Reactance
Ans: C
38. The superposition of a low frequency message signal on a high frequency carrier wave is called :
(A) Amplification (B) Modulation (C) Attenuation (D) Demodulation
Ans: B
39. A quantum mechanical theory for explaining superconductivity is :
(A) KC Rule (B) BCS theory (C) KV Rule (D) NMR theory
Ans: B
40. Which experiment proved the particle nature of light ?
(A) Interference (B) Diffraction (C) Compton effect (D) Polarisation
Ans: C
41. A magnet dropped through an aluminium pipe takes more time than through a PVC pipe of same dimension to reach the bottom. This is due to :
(A) Electrostatic shielding (B) Electromagnetic damping
(C) Electromagnetic radiation (D) Convection
Ans: B
42. The principle which helps in explaining blood flow and heart attack in artery :
(A) Torricelli’s Law (B) Hooke’s Law
(C) Bernoulli’s Principle (D) Snell’s Law
Ans: C
43. Which of the following substances has more specific heat capacity ?
(A) Carbon (B) Copper (C) Water (D) Silver
Ans: C
44. In an isothermal process :
(A) Heat Constant (B) Volume Constant
(C) Pressure Constant (D) Temperature Constant
Ans: D
(A) V=IR
(B) V=I/R
(C) I= R/V
(D) I=VR
Ans: A
30. Choose the odd one :
(A) Electromagnetic force (B) Gravitational force
(C) Strong nuclear force (D) Spring force
Ans: D
31. Earth magnetism is due to :
(A) Dynamo effect (B) Doppler effect (C) Solar effect (D) Magnus effect
Ans: A
32. Which principle is used to check the correctness of an equation ?
(A) Principle of Continuity (B) Principle of Parallax
(C) Principle of Conduction (D) Principle of Homogeneity
Ans: D
33. The acronym LASER stands for :
(A) Light Amplification by Stimulated Emission of Radiation.
(B) Light Attenuation by Stimulated Emission of Radiation.
(C) Large Amplification by Stimulated Emission of Radiation.
(D) Light Amplification by Slowed Emission of Radiation.
Ans: A
34. In a uniform circular motion :
(A) Velocity is constant (B) Distance is constant
(C) Displacement is constant (D) Speed is constant
Ans: D
35. The process of deliberate addition of desirable impurity in an intrinsic semiconductor is :
(A) Doping (B) Bonding (C) Diffusion (D) Sublimation
Ans: A
36. In 1921 Albert Einstein was awarded Nobel Prize in the study of :
(A) Black body Radiation (B) Photoelectric effect
(C) Mass-Energy Relation (D) Atom model
Ans: B
37. Henry is the unit of :
(A) Capacitance (B) Resistance (C) Inductance (D) Reactance
Ans: C
38. The superposition of a low frequency message signal on a high frequency carrier wave is called :
(A) Amplification (B) Modulation (C) Attenuation (D) Demodulation
Ans: B
39. A quantum mechanical theory for explaining superconductivity is :
(A) KC Rule (B) BCS theory (C) KV Rule (D) NMR theory
Ans: B
40. Which experiment proved the particle nature of light ?
(A) Interference (B) Diffraction (C) Compton effect (D) Polarisation
Ans: C
41. A magnet dropped through an aluminium pipe takes more time than through a PVC pipe of same dimension to reach the bottom. This is due to :
(A) Electrostatic shielding (B) Electromagnetic damping
(C) Electromagnetic radiation (D) Convection
Ans: B
42. The principle which helps in explaining blood flow and heart attack in artery :
(A) Torricelli’s Law (B) Hooke’s Law
(C) Bernoulli’s Principle (D) Snell’s Law
Ans: C
43. Which of the following substances has more specific heat capacity ?
(A) Carbon (B) Copper (C) Water (D) Silver
Ans: C
44. In an isothermal process :
(A) Heat Constant (B) Volume Constant
(C) Pressure Constant (D) Temperature Constant
Ans: D
45. Name the electromagnetic radiation which has lowest wavelength.
A) Visible light B) X-rays
C) Gamma rays D) Ultraviolet radiations
Ans: C
46. The sound of which of the following frequency is audible to human ears ?
A) 200 Hertz B) 25 Kilo Hertz C) 2 Hertz D) 30 Kilo Hertz
Ans: A
47. S.I. unit of work is
A) Newton B) Joule C) Pascal D) Bar
Ans: B
48. Who proposed quantum theory of radiation ?
A) Neils Bohr B) Mendeleev
C) Ruther Ford D) Max Planck
Ans: D
49. The law which relates volume and temperature of a gas at constant pressure is
A) Charle's law B) Boyle's law
C) Avogadro's law D) Dalton's law
Ans: A
A) Visible light B) X-rays
C) Gamma rays D) Ultraviolet radiations
Ans: C
46. The sound of which of the following frequency is audible to human ears ?
A) 200 Hertz B) 25 Kilo Hertz C) 2 Hertz D) 30 Kilo Hertz
Ans: A
47. S.I. unit of work is
A) Newton B) Joule C) Pascal D) Bar
Ans: B
48. Who proposed quantum theory of radiation ?
A) Neils Bohr B) Mendeleev
C) Ruther Ford D) Max Planck
Ans: D
49. The law which relates volume and temperature of a gas at constant pressure is
A) Charle's law B) Boyle's law
C) Avogadro's law D) Dalton's law
Ans: A
50. What is increased in a step down transformer ?
(A) Voltage (B) Current
(C) Wattage (D) None of the above
Ans: B
51. A dynamo converts :
(A) high voltage into low voltage
(B) low voltage into high voltage
(C) electrical energy into mechanical energy
(D) mechanical energy into electrical energy
Ans: D
52. Example for 2nd order lever is :
(A) scissors (B) nutcracker (C) tweezers (D) see-saw
Ans: B
53. 1 kcal is equal to :
(A) 4.2 joules (B) 420 joules (C) 4200 joules (D) 6000 joules
Ans: C
54. Coefficient of friction is equal to the ratio of limiting friction to :
(A) static friction (B) sliding friction (C) kinetic friction (D) normal reaction
Ans: D
(A) Voltage (B) Current
(C) Wattage (D) None of the above
Ans: B
51. A dynamo converts :
(A) high voltage into low voltage
(B) low voltage into high voltage
(C) electrical energy into mechanical energy
(D) mechanical energy into electrical energy
Ans: D
52. Example for 2nd order lever is :
(A) scissors (B) nutcracker (C) tweezers (D) see-saw
Ans: B
53. 1 kcal is equal to :
(A) 4.2 joules (B) 420 joules (C) 4200 joules (D) 6000 joules
Ans: C
54. Coefficient of friction is equal to the ratio of limiting friction to :
(A) static friction (B) sliding friction (C) kinetic friction (D) normal reaction
Ans: D
55. The property of a material to resist deformation under stress :
(A) Hardness (B) Plasticity (C) Stiffness (D) Brittleness
Ans: C
56. Bronze is an alloy of copper and __________ .
(A) Tin (B) Lead (C) Zinc (D) Aluminium
Ans: A
57. Engine cylinders are made of :
(A) Mild steel (B) Carbon steel (C) High speed steel (D) Cast iron
Ans: D
58. The effective resistance of three resistors 3Ω, 4Ω, 5Ω used in series connection is ________.
(A) 7 Ω (B) 5 Ω (C) 12 Ω (D) 3 Ω
Ans: C
59. A resistance of 900 Ω is connected across 220 V supply. The power of the current is :
(A) 54W (B) 180W (C) 360W (D) 760W
Ans: A
60. The ratio of shear stress to shear strain is :
(A) Youngs modulus (B) Bulk modulus
(C) Rigidity modulus (D) Poisson’s ratio
Ans: C
61. Find the amount of heat required to raise the temperature of 3.2 litres of water from 30 deg C to 48 deg C.
(A) 42.0 kcal (B) 57.6 kcal (C) 36.5 kcal (D) 78.5 kcal
Ans: B
62. Melting point of Iron is :
(A) 1538 deg C (B) 2050 deg C (C) 1538 deg F (D) 2050 deg F
Ans: A
63. Eddy current loss in a transformer is reduced by :
(A) using thick wires (B) using material with low hysteresis loss
(C) having a laminated core (D) using iron core
Ans: C
64. The resistance and tolerance of a yellow, violet, red coded resistor respectively are :
(A) 47 kΩ, 10% (B) 4.7 kΩ, 10% (C) 47kΩ, 20% (D) 4.7 kΩ, 20%
Ans: D
65. If an element of atomic number 15 has an isotope of mass number 32 :
(A) The number of neutrons in the nucleus is 17
(B) The number of neutrons in the nucleus is 15
(C) The number of protons in the nucleus is 17
(D) The number of nucleons in the nucleus is 15
Ans: A
66. The impurity atoms with which a pure silicon be doped to make a p-type semiconductor is :
(A) Aluminium (B) Arsenic (C) Antimony (D) Germanium
Ans: A
67. The range of frequencies allotted for FM radios is :
(A) 88 to 108 kHz (B) 88 to 108 MHz (C) 47 to 230 kHz (D) 47 to 230 MHz
Ans: B
68. The sound produced by a tuning fork is a :
(A) analog signal (B) digital signal
(C) both (A) and (B) (D) pulse signal
Ans: A
(A) Hardness (B) Plasticity (C) Stiffness (D) Brittleness
Ans: C
56. Bronze is an alloy of copper and __________ .
(A) Tin (B) Lead (C) Zinc (D) Aluminium
Ans: A
57. Engine cylinders are made of :
(A) Mild steel (B) Carbon steel (C) High speed steel (D) Cast iron
Ans: D
58. The effective resistance of three resistors 3Ω, 4Ω, 5Ω used in series connection is ________.
(A) 7 Ω (B) 5 Ω (C) 12 Ω (D) 3 Ω
Ans: C
59. A resistance of 900 Ω is connected across 220 V supply. The power of the current is :
(A) 54W (B) 180W (C) 360W (D) 760W
Ans: A
60. The ratio of shear stress to shear strain is :
(A) Youngs modulus (B) Bulk modulus
(C) Rigidity modulus (D) Poisson’s ratio
Ans: C
61. Find the amount of heat required to raise the temperature of 3.2 litres of water from 30 deg C to 48 deg C.
(A) 42.0 kcal (B) 57.6 kcal (C) 36.5 kcal (D) 78.5 kcal
Ans: B
62. Melting point of Iron is :
(A) 1538 deg C (B) 2050 deg C (C) 1538 deg F (D) 2050 deg F
Ans: A
63. Eddy current loss in a transformer is reduced by :
(A) using thick wires (B) using material with low hysteresis loss
(C) having a laminated core (D) using iron core
Ans: C
64. The resistance and tolerance of a yellow, violet, red coded resistor respectively are :
(A) 47 kΩ, 10% (B) 4.7 kΩ, 10% (C) 47kΩ, 20% (D) 4.7 kΩ, 20%
Ans: D
65. If an element of atomic number 15 has an isotope of mass number 32 :
(A) The number of neutrons in the nucleus is 17
(B) The number of neutrons in the nucleus is 15
(C) The number of protons in the nucleus is 17
(D) The number of nucleons in the nucleus is 15
Ans: A
66. The impurity atoms with which a pure silicon be doped to make a p-type semiconductor is :
(A) Aluminium (B) Arsenic (C) Antimony (D) Germanium
Ans: A
67. The range of frequencies allotted for FM radios is :
(A) 88 to 108 kHz (B) 88 to 108 MHz (C) 47 to 230 kHz (D) 47 to 230 MHz
Ans: B
68. The sound produced by a tuning fork is a :
(A) analog signal (B) digital signal
(C) both (A) and (B) (D) pulse signal
Ans: A
69. Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? (g = 10 m/s2)
(1) 7.0 kW
(2) 8.1 kW
(3) 10.2 kW
(4) 12.3 kW
Ans: 2
70. A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
(1) 13 m/s and 14 m/s
(2) 14 m/s and 15 m/s
(3) 15 ms/ and 16 m/s
(4) 16 m/s and 17 m/s
Ans: 2
71. If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then
(1) Q = 0
(2) W = 0
(3) Q = W = 0
(4) E = 0
Ans: 4
72. On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39 degree W and 239 degree W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 degree C on the Celsius scale?
(1) 139degree W
(2) 78 degree W
(3) 117 degree W
(4) 200 degree W
Ans: 3
73. A wire of a certain material is stretched slowly by ten per cent. It new resistance and specific resistance become respectively
(1) 1.1 times, 1.1 times
(2) 1.2 times, 1.1 times
(3) 1.21 times, same
(4) Both remain the same
Ans: 3
74. An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C.
(1) 4.2 min
(2) 6.3 min
(3) 8.4 min
(4) 12.6 min
Ans: 2
75. Curie temperature is the temperature above which
(1) Ferromagnetic material becomes diamagnetic material
(2) Ferromagnetic material becomes paramagnetic material
(3) Paramagnetic material becomes diamagnetic material
(4) Paramagnetic material becomes ferromagnetic material
Ans: 2
76. In the phenomenon of electric discharge through gases at low pressure, the colored glow in the tube appears as a result of
(1) Collision between different electrons of the atoms of the gas
(2) Excitation of electrons in the atoms
(3) Collision between the atoms of the gas
(4) Collisions between the charged particles emitted from the cathode and the atoms of the gas
Ans: 2
77. The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
(1) X-ray region
(2) Ultraviolet region
(3) Visible region
(4) Infrared region
Ans: 2
78. The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is
(1) 0
(2) 3.4 eV
(3) 6.8 eV
(4) 10.2 eV
Ans: 4
79. The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
(1) 100
(2) 90
(3) 10
(4) 1.25
Ans: 1
(1) 7.0 kW
(2) 8.1 kW
(3) 10.2 kW
(4) 12.3 kW
Ans: 2
70. A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
(1) 13 m/s and 14 m/s
(2) 14 m/s and 15 m/s
(3) 15 ms/ and 16 m/s
(4) 16 m/s and 17 m/s
Ans: 2
71. If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then
(1) Q = 0
(2) W = 0
(3) Q = W = 0
(4) E = 0
Ans: 4
72. On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39 degree W and 239 degree W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 degree C on the Celsius scale?
(1) 139degree W
(2) 78 degree W
(3) 117 degree W
(4) 200 degree W
Ans: 3
73. A wire of a certain material is stretched slowly by ten per cent. It new resistance and specific resistance become respectively
(1) 1.1 times, 1.1 times
(2) 1.2 times, 1.1 times
(3) 1.21 times, same
(4) Both remain the same
Ans: 3
74. An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C.
(1) 4.2 min
(2) 6.3 min
(3) 8.4 min
(4) 12.6 min
Ans: 2
75. Curie temperature is the temperature above which
(1) Ferromagnetic material becomes diamagnetic material
(2) Ferromagnetic material becomes paramagnetic material
(3) Paramagnetic material becomes diamagnetic material
(4) Paramagnetic material becomes ferromagnetic material
Ans: 2
76. In the phenomenon of electric discharge through gases at low pressure, the colored glow in the tube appears as a result of
(1) Collision between different electrons of the atoms of the gas
(2) Excitation of electrons in the atoms
(3) Collision between the atoms of the gas
(4) Collisions between the charged particles emitted from the cathode and the atoms of the gas
Ans: 2
77. The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
(1) X-ray region
(2) Ultraviolet region
(3) Visible region
(4) Infrared region
Ans: 2
78. The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is
(1) 0
(2) 3.4 eV
(3) 6.8 eV
(4) 10.2 eV
Ans: 4
79. The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
(1) 100
(2) 90
(3) 10
(4) 1.25
Ans: 1
80. A siren emitting a sound of frequency 800 HZ moves away from an observer towards a cliff at a speed of 15 ms-l. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is :
(Take velocity of sound in air =330 ms-1)
(1) 838 Hz
(2) 885 Hz
(3) 765 Hz
(4) 800 Hz
Ans: 1
81. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then inopposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is :
(1) 3 :4
(2) 3 :2
(3) 5 :1
(4) 5 :4
Ans: 2
82. An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is :
(1) 150cm
(2) 200 cm
(3) 66.7cm
(4) 100 cm
Ans: 1
83. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then :
(1) Compressing the gas isothermally or adiabatically will require the same amount of work.
(2) Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
(3) compressing the gas isothermally will require more work to be done.
(4) Compressing the gas through adiabatic process will require more work to be done.
Ans: 4
84. Two non-mixing liquids of densities p and np (n > 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL (p < 1) in the denser liquid. The density d is equal to : (1) (2+(n-l)P)P
(2) (1+(n -l)PIP
(3) (1+(n+l)P)P
(4) (2+(n +~)P)
Ans: 2
85. A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance :
(1) 50.0 cm
(2) 54.0 cm
(3) 37.3 cm
(4) 46.0 cm
Ans: 2
86. If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is :
(1) 45 degree
(2) 180 degree
(3) 0 degree
(4) 90 degree
Ans: 4
87. The magnetic susceptibility is negative for :
(1) ferromagnetic material only
(2) paramagnetic and ferromagnetic materials
(3) diamagnetic material only
(4) paramagnetic material only
Ans: 3
88. A disk and a sphere of same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?
(1) Both reach at the same time
(2) Depends on their masses
(3) Disk
(4) Sphere
Ans: 4
89. From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre ?
(1) 11 MR2/32
(2) 9 MR2/32
(3) 15 MR2/32
(4) 13 MR2/32
Ans: 4
(Take velocity of sound in air =330 ms-1)
(1) 838 Hz
(2) 885 Hz
(3) 765 Hz
(4) 800 Hz
Ans: 1
81. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then inopposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is :
(1) 3 :4
(2) 3 :2
(3) 5 :1
(4) 5 :4
Ans: 2
82. An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is :
(1) 150cm
(2) 200 cm
(3) 66.7cm
(4) 100 cm
Ans: 1
83. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then :
(1) Compressing the gas isothermally or adiabatically will require the same amount of work.
(2) Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
(3) compressing the gas isothermally will require more work to be done.
(4) Compressing the gas through adiabatic process will require more work to be done.
Ans: 4
84. Two non-mixing liquids of densities p and np (n > 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL (p < 1) in the denser liquid. The density d is equal to : (1) (2+(n-l)P)P
(2) (1+(n -l)PIP
(3) (1+(n+l)P)P
(4) (2+(n +~)P)
Ans: 2
85. A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance :
(1) 50.0 cm
(2) 54.0 cm
(3) 37.3 cm
(4) 46.0 cm
Ans: 2
86. If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is :
(1) 45 degree
(2) 180 degree
(3) 0 degree
(4) 90 degree
Ans: 4
87. The magnetic susceptibility is negative for :
(1) ferromagnetic material only
(2) paramagnetic and ferromagnetic materials
(3) diamagnetic material only
(4) paramagnetic material only
Ans: 3
88. A disk and a sphere of same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?
(1) Both reach at the same time
(2) Depends on their masses
(3) Disk
(4) Sphere
Ans: 4
89. From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre ?
(1) 11 MR2/32
(2) 9 MR2/32
(3) 15 MR2/32
(4) 13 MR2/32
Ans: 4
90. Ground state energy level of a particle in a cubical box is :
(A) six fold degenerate (B) three fold degenerate
(C) two fold degenerate (D) non-degenerate
Ans: D
91. With increase in quantum numbers, the energy difference between successive energy levels of an anharmonic oscillator ?
(A) remains same (B) increases
(C) decreases (D) periodically increase and decrease
Ans: C
92. The uncertainty relation applies to :
(A) Position and momentum only
(B) Energy and time only
(C) Angular momentum and angle only
(D) All canonically conjugate physical quantities whose product has dimensions of action
Ans: D
93. Klein - Gordan equation is valid for :
(A) Electrons (B) Protons
(C) Spin ½ particles (D) Spin zero particles
Ans: D
94. No two electrons can have all the four quantum numbers identical. This is the statement of :
(A) Uncertainty principle (B) Pauli’s exclusion principle
(C) Hamilton’s principle (D) Gauss principle
Ans: B
95. When curl of a vector is zero in some region, then in that region the vector is :
(A) Rotational (B) Irrotational (C) Diverging (D) Converging
Ans: B
96. The residue of cot Z at Z=0 is :
(A) Zero (B) π (C) −1 (D) 1
Ans: D
97. A point at which a function f(z) ceases to be analytic is called :
(A) singularity (B) double pole (C) pole (D) holonomic
Ans: A
98. Commutative group is called :
(A) semi group (B) abelian group (C) monoid (D) android
Ans: B
99. A group having no proper normal subgroup is called :
(A) normal subgroup (B) abelian subgroup
(C) simple group (D) trivial subgroup
Ans: C
100. Kronecker delta is a mixed tensor of order :
(A) One (B) Two (C) Zero (D) Three
Ans: B
(A) six fold degenerate (B) three fold degenerate
(C) two fold degenerate (D) non-degenerate
Ans: D
91. With increase in quantum numbers, the energy difference between successive energy levels of an anharmonic oscillator ?
(A) remains same (B) increases
(C) decreases (D) periodically increase and decrease
Ans: C
92. The uncertainty relation applies to :
(A) Position and momentum only
(B) Energy and time only
(C) Angular momentum and angle only
(D) All canonically conjugate physical quantities whose product has dimensions of action
Ans: D
93. Klein - Gordan equation is valid for :
(A) Electrons (B) Protons
(C) Spin ½ particles (D) Spin zero particles
Ans: D
94. No two electrons can have all the four quantum numbers identical. This is the statement of :
(A) Uncertainty principle (B) Pauli’s exclusion principle
(C) Hamilton’s principle (D) Gauss principle
Ans: B
95. When curl of a vector is zero in some region, then in that region the vector is :
(A) Rotational (B) Irrotational (C) Diverging (D) Converging
Ans: B
96. The residue of cot Z at Z=0 is :
(A) Zero (B) π (C) −1 (D) 1
Ans: D
97. A point at which a function f(z) ceases to be analytic is called :
(A) singularity (B) double pole (C) pole (D) holonomic
Ans: A
98. Commutative group is called :
(A) semi group (B) abelian group (C) monoid (D) android
Ans: B
99. A group having no proper normal subgroup is called :
(A) normal subgroup (B) abelian subgroup
(C) simple group (D) trivial subgroup
Ans: C
100. Kronecker delta is a mixed tensor of order :
(A) One (B) Two (C) Zero (D) Three
Ans: B