Physics MCQs (FREE Multiple Choice Questions)

1: Three identical balls wit h charges 12 x10‘12 C, 8 x1012 C, and -5 x10'12 C, respectively are brought in contact with each other and then separated. What is the correct number of electrons in excess or def‌icit on each ball after the contact?

A. 3.125 x107

B. 5.187 x107

C. 4.277 x 107

D. 6.911x107

2: A snowball with a weight of 1.50 kg is shot upward at a 30° angle to the horizontal. If the initial speed is 30 m/s. then what is the change in the gravitational potential energy of the snowball—Earth system. as the snowball moves from the launch point to the point of maximum height? What will be that maximum height?

A. 169 J and 11.5 m, respectively

B. 178 J and 18.4 m, respectively

C. 112 J and 21.2 rn, respectively

D. 157 J and 14.8 m, respectively

3: If the mass of a vehicle is 1800 kg, then what is the work required to be done for increasing the velocity of the vehicle from 60 km/h to 120 km/h?

A. 832600 J

B. 749700 J

C. 128840 J

D. 116260 J

4: Which of the following options is the correct number of the electric lines of force that originates from a 1 C charge?

A. 3.65 x109

B. 1.129 x 1011

C. 4.86 x1015

D. 8.18 x107

5: Which of the following laws states that the algebraic sum of the products of resistance and current in each part of any closed circuit is equal to the algebraic sum of the emf's in that closed circuit?

A. Faraday‘s f‌irst law

B. Kirchoff's first law

C. Kirchoff's second law

D. Faraday's second law

6: Which of the following statements correctly states the Law of Conservation of Mechanical Energy?

A. It states that when no non-conservative forces are acting, the sum of the kinetic and potential energies of an object are constant as the object moves around.

B. It states that the difference between the potential and kinetic energies of an object is zero, if no non-conservative forces are acting as the object moves around.

C. It states that an object is in force equilibrium if its potential energy function is minimum.

D. It states that the value of potential energy is twice the value of kinetic energies of an object, if no non-conservative forces are acting as the object moves around.

7: What is the approximate energy associated with big bang?

A. 10123 J

B. 1055 J

C. 1068 J

D. 1082 J

8: Consider that a sample of 238U92 is undergoing o—decay. Its half-life is 4.5 x109 years. Find the activity 0f 1 g sample of 238U92.

A. 1.23 x104 Bq

B. 1.83 x103 Bq

C. 2.83 x103 Bq

D. 1.62 x104 Bq

9: Which of the following options is the correct frequency band for FM broadcast in India?

A. 140-160 MHz

B. 76-88 MHz

C. 174-216 MHz

D. 88-108 MHz

10: Two parallel wires are placed at a distance of 10 cm apart. The length of each of these wires is 5 m and they carry equal currents along the same direction. Find the current through the conductors, if they experience a mutually attractive force of 4.9 x104 N.

A. 5.2 A

B. 8.5 A

C. 7 A

D. 6 A

11: An object is at a certain height above the ground. If the object's mass is 15 kg and its potential energy is 540 J. then at what height the object is with respect to the ground. (Consider the value of g =10 m/sz.)

A. 4 m

B. 4.8 m

C. 3 m

D. 3.6 m

12: A raindrop falls from a height of1 km. If the mass of this drop is 1.00 g and it hits the ground with a speed of 60 m/s. then what is the work done by the unknown resistive forces?

A. 7.4 J

B. -5.7 J

C. 11.2 J

D. -8.2 J

13: Consider that three charges -4 x10‘9C. +6 x10‘9C, and -8 x10‘9C are placed at the vertices of an equilateral triangle XYZ. The sides of the triangle are 40 cm each. If X1, Y1, 21 are the mid points of the sides of the triangle. then what is the work done in shifting the charges X. Y and Z to X1. Y1. 21. respectively?

A. -8 x10"7 J

B. -9 x10'7 J

C. -2.3 x10”7 J

D. -13 x10‘7 J

14:

In the given image. what is the correct value of VCEq for the given network?

A. 4.12 v

B. 4.44 v

C. 3.98 v

D. 3.28 v

15: The height of a transmitting antenna located at the top ofa tower is 80m and that of a receiving antenna is 320m. If the radius of the earth is 6.4 x10'5 m. then what should be the maximum distance between them for the satisfactory communication in LOS mode?

A. 90 km

B. 88 km

C. 96 km

D. 98 km

16: What is the correct value of the temperature coeff‌icient, if the resistance of a field coil is 60 Q at 30°C and 80 Q at 90°C?

A. 0.0842 /°C

B. 1.45 /°C

C. 0.54 /°C

D. 0.0067 /°c

17: In accordance with the classical electromagnetic theory, what is the approximate initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom?

A. 8.2 x 1015 Hz

B. 5.8 x 1013 Hz.

C. 7.4 x 1018 Hz.

D. 6.6 x1015 Hz.

18: Which of the following options is the approximate range of resistivity of the semiconductors?

A. 10-12 - 108 o m

B. 10-3 — 109 o m

C. 10-5 —10'6 o m

D. 10-9 —1o8o m

19: Which of the following options is a device that is used for converting one form of energy into another?

A. Transducer

B. Transmitter

C. Repeater

D. Amplif‌ier

20:

Which of the following types of wave has the given characteristics?

i) The wave travels in a straight line from transmitting antenna to the receiving antenna.

ii) It is used for line-of-sight communication.

A. Ground wave

B. Sky wave

C. Space wave

D. None of the above.

21: What is the bandwidth of video signal required for the transmission of pictures?

A. 6.8 MHz

B. 4.2 MHz

C. 2.5 MHz

D. 8.3 MHz

22: What is the correct value of the wavelength of the fourth spectral line (£51) in the Lyman series of the hydrogen spectrum?

A. 974.3 A

B. 936.2 A

C. 951.4 A

D. 985.5 A

23: If 0.8m is the distance between the two insulated charged spheres of charges 8.5 x10‘7 C each, then what is the force when the charges are doubled and the distance of separation among them is halved?

A. 0.21 N

B. 0.16 N

C. 0.05 N

D. 0.34 N

24: In a Young's experiment, 3 mm is the width of the fringes obtained with light having a wavelength of 9000 A. If the entire apparatus is immersed in a liquid of refractive index 1.33, then what is the fringe width?

A. 1.24 mm

B. 2.92 mm

C. 2.26 mm

D. 1.83 mm

25: The radius of the nucleus is smaller than the radius of an atom by which of the following factors?

A. 102

B. 106

C. 104

D. 108

26: Calculate the mass defect of Oxygen (atomic mass = 16, atomic number = 8) in MeV/cz.

A. 112.8 MeV/c2

B. 135.2 MeV/c2

C. 132.8 MeV/c2

D. 127.5 MeV/c2

27: In relation to spectral series, which of the following options correctly states the Brackett series? (Consider that A is the wavelength, R is Rydberg constant, and n may have integral values.)

A. 1/A = 1/R [1/22 —1/n2]

B. 1/A = R [1/42 —1/n2]

C. 1M = R [1/12 —1/n2]

D. 1M =1/R [1/32 — 1/n2]

28: If the least distance of distinct vision for a person is 50 cm, then what should be the focal length of the reading spectacles for that person?

A. + 40 cm (convex lens)

B. + 50 cm (convex lens)

C. + 60 cm (concave lens)

D. + 50 cm (concave lens)

29: Which of the following types of forces is experienced by a dipole that is placed in a uniform electric f‌ield with its axis parallel to the f‌ield?

A. Only a torque

B. Only a net force

C. Both a torque and a net force.

D. Neither a torque nor a net force.

30: What is the linear charge density, if an inf‌inite line charge produces a f‌ield of 8 x104 N C'1 at a distance of 1.8 cm?

A. 2 x10'8 c m"

B. 0.5 x 10-8 c m"

C. 1.5 x10'7 C m-1

D. 0.8 x10'7 C m'1

31: Which of the following options correctly def‌ines the range (dT), if an antenna radiates electromagnetic waves from a height h? (Consider that R is the radius of the earth.)

A. Rht/2

B. (2Rht)

C. (2R/ht)

D. 2R/ht

32: If q is the charge given to a conductor and V is the potential developed in the conductor, then which of the following options correctly defines the capacitance?

A. qV

B. q/v

C. 2qV

D. q/2V

E. 2q/v

33: Which of the following options is the correct definition of Ampere's Circuital Law?

A. B = pol/2m

B. B = 2nLto/al

C. B = 4uoa/nl

D. B = Attila/uo

34: Consider that a cyclist comes to a skidding stop in 20 m. How much work is done by the road on the cycle, if the force on the cycle due to the road is 300 N and is directly opposed to the motion?

A. -1000 J

B. -5600 J

C. -8000 J

D.

E. 0 J

35:

What is the approximate value of ID for the diode in the given image?

Note: It is given that VD=0.7 V.

A. 2.17 mA

B.

2.64 mA

C.

3.32 mA

D.

3.71 mA

36: Leo lifted a container of 25 kg from the ground and puts it on his head 1.6 meter above the ground. What is the work done on the container by Leo?

A. 520 J

B. 400 J

C. 460 J

D. 500 J

37: For a double convex lens, the radii of curvature of the faces are 20 cm and 30 cm. What is the refractive index of the glass, if its focal length is 24 cm?

A. 0.8

B. 1.2

C. 1.5

D. 1.8

38: For separating a hydrogen atom into a proton and an electron, 13.6 eV energy is required. What is the velocity of the electron in a hydrogen atom?

A. 2.8 x108 m/s

B. 3.1x108 m/s

C. 2.2 x 10‘5 m/s

D. 3.2 x 106 m/s

39: When 15 O resistance is connected across the galvanometer, its deflection falls from 60 divisions to 20 divisions. What is the correct value of the galvanometer resistance?

A. 28 o

B. 30 o

C. 32 o

D. 34 o

40: While undergoing beta decay, the half-life of tritium is 12.5 years. After 25 years, what fraction of a sample of pure tritium will be decayed?

A. ½

B. 3/2

C. 1/4

D. ¾

41: A satellite with 10 kg weight is circling around the earth once every 2 hours. The radius of the orbit is 9000 km. What is the quantum number of the orbit of the satellite. assuming that Bohr's angular momentum postulate applies to the satellites?

A. 6.7 x 10“5

B. 12.5 x 1054

C. 4.8 x1040

D. 9.7 x 10"2

42: How much time is required by the sun for taking a shift by 1° when viewed from the earth, if it is given that the earth takes 24 hours to rotate once about its axis?

A. 5 minutes

B. 4 minutes

C. 7 minutes

D. 8 minutes

E. 10 minutes

43: In Newton's rings experiment, if the diameter of a certain order of a dark ring is four times that of the second ring, then what is the order of the ring?

A. 16

B. 20

C. 24

D. 32

44: Which of the following options could be the lowest temperature of mesosphere?

A. -120° C

B. -170° C

C. -90° C

D. -80° C

45: Which of the following options is the correct critical angle of a diamond?

A. 2046*

B. 3183"

C. 24.41°

D. 36.55°

46: Light falls on a spherical glass surface from a point source in air. It is given that n=1.5 for the spherical glass surface and the radius of curvature is 40 cm. At which of the following positions the image is formed. if the distance of the light source from the glass surface is 100 cm?

A. 160 cm

B. 300 cm

C. 480 cm

D. 600cm

47: For a ray incident from a denser to rarer medium, what is the critical angle of incidence it?

A. It is the angle for which refraction angle is 90°.

B. It is the angle for which refraction angle is 120°

C. It is the angle for which refraction angle is 60°.

D. It is the angle for which refraction angle is 180°.

48: The northern lights and the aurora occurs in which of the following layers of atmosphere?

A. Mesosphere

B. Exosphere

C. Thermosphere

D. Stratosphere

49:

In the given image. what position of the image is formed by the lens combination?

A.

The final image is formed 30 cm to the left of the third lens.

B.

The final image is formed 50 cm to the right of the second lens.

C.

The f‌inal image is formed 60 cm to the right of the third lens.

D.

The final image is formed 40 cm to the left of the second lens.

50: If:{ is the wavelength of the signal, then what should be the minimum size of the antenna so that it properly senses the time variation of the signal?

A. A/4

B. A/6

C. A/8

D. A/10

51: Which of the following options is the correct value of the refractive index of water?

A. 1.52

B. 1.33

C. 1.42

D. 1.53

52: Which of the following types of biasing is used in Zener diode?

A. Forward

B. Reverse

C. No biasing is used.

53: Which of the following statements is NOT correct about JFETs (Junction Field Effect Transistors)?

A. They are three lead semiconductor devices.

B. JFETs require a bias current.

C. JFETs are used as current amplif‌iers and voltage-controlled resistors.

D. For JFETs, V6 —V5 = 0, when they are on.

54: Which of the following options is/are intrinsic semiconductors?

A. C

B. Si

C. Ge

D. Both options a and b.

E. Both options b and c.

F. Both options a and c.

55: The maximum load capacity (elevator and passengers) ofan elevator is 1600 kg. It is moving up with a constant speed of 1.8 m/s. What is the minimum power delivered by the motor to the elevator. if the frictional force opposing the motion is 4000 N?

A. 42000 w

B. 36000 w

C. 45000 w

D. 30000 w

56: Which of the following options is NOT a correct difference between the interference and diffraction?

A. Interference is because of the superposition of secondary wavelets from two different wavefronts that are produced by two coherent sources, while diffraction is because of the superposition of secondary wavelets that are emitted from different points of the same wavefront.

B. In Interference, fringes are equally spaced, while in diffraction, fringes are unequally spaced.

C. In Interference, bright fringes are of the same intensity, while in diffraction, the intensity of the fringes falls rapidly.

D. Interference has lesser number of fringes as compared to the diffraction.

57: Interference fringes are produced in Young‘s double slit experiment by using two coherent sources of intensity ratio of 49 :1. What is the correct ratio of maximum and minimum intensities?

A. 16:9

B. 18:7

C. 20:9

D. 25:8

58: Which of the following options is the correct unit of permittivity?

A. CN2m-2

B. Cm'2

C. C2N"m‘2

D. Nm‘2

59:

In the given image, what is the value of Vimx for the given Zener diode (in the 'on' state)?

A. 52.3 v

B. 45.9 v

C. 51.6 v

D. 57.7 v

60: What is the power of a lens if the value of its focal length is 0.8 m?

A. +2 dioptre

B. +1 dioptre

C. +1.25 dioptre

D. +2.25 dioptre

61: Find the current, if 8.25 x 1018 electrons flow through a given cross section in unit time.

A. 1.32 A

B. 2.45 A

C. 1.69 A

D. 2.07 A

62: Which of the following options is the correct composition of a fuse wire?

A. 33% lead and 67% aluminium.

B. 37% lead and 63% tin

C. 27% aluminium and 63% tin.

D. 40% aluminium and 60% tin.

63: Ryan fires a bullet with a speed of 200 m/s on a soft plywood. The mass of the bullet is 50.0 g and the thickness of the plywood is 2.00 cm. What is the emergent speed of the bullet if it emerges with only 10% of its initial kinetic energy?

A. 92.5 m/s

B. 97.2 m/s

C. 63.2 m/s

D. 76.6 m/s

64: A current of 3A is carried by a copper wire having 10'6 m2 area of cross section. What is the correct value of average drift velocity, if the number of electrons per cubic metre is 9X10”?

A. 20.8 x 10'5 m/s

B. 18.2 x 10‘5 m/s

C. 15.5 x10‘5 m/s

D. 24.3 x10‘5 m/s

65: Lisa is sitting in a parked car. She noticed Ryan approaching towards the car in the side view mirror of R = 2m. How fast the image of Ryan appears to move when he is 39m away? Note: It is given that Ryan is moving at a speed of 5 m/s.

A. 1/280 m/s

B. 1/140 mls

C. 1/400 m/s

D. 1/300 m/s

66: Consider a parallel plate capacitor in which the plates are separated by 3.0 mm. The area of each of these plates is 120 cm2. A 450 V supply is used for Charging this capacitor. What is the correct value of electrostatic energy stored by the capacitor?

A. 6.72 x 107 J

B. 5.34 x10‘6 .1

C. 3.58 x10“6 J

D. 1.86 x 10-71

67: Suppose a plano — convex lens is placed on an optically f‌iat glass plate. The radius of the lens is 3m and the lens is illuminated by monochromatic light. What is the wavelength of the light used. if the radius of the 8”1 dark ring is 4.2mm?

A. 7350 A

B. 8520 A

C. 6000 A

D. 9800 A

68: What is the force on a conductor of the length 60 cm carrying a current of 5A which is placed perpendicular to a magnetic field of induction 4 x10'3 T?

A. 1.2 x10'2 N

B. 1.6 x 10-3 N

C. 2.6 x10'2 N

D. 2.4 x10'3 N

69: Consider two slits that are 0.5 mm apart. These slits are illuminated by the light of wavelength 5000 A. What is the separation between the second bright fringe on both the sides of central maximum, if the screen is placed at 1 m distance from the slits?

A. 6 mm

B. 5 mm

C. 4 mm

D. 3 mm

70:

Three parallel conductors X, Y, and Z are carrying currents as shown in the f‌igure. If the length of each of the conductor is 10 m, then what is the magnitude and direction of the resultant force on the conductor Y?

A.

The wire Y is attracted towards 2 with a net force of 18 x 10'5 N.

B.

The wire Y is attracted towards Z with a net force of 24 X 10‘5 N.

C.

The wire Y is attracted towards 2 with a net force of 16 x 10'5 N.

D.

The wire Y is attracted towards 2 with a net force of 20 X105 N.

71: What is the correct wavelength range of the visible light?

A. 2000 A — 6000 A

B. 4000 A - 8000 A

C. 3000 A - 12000 A

D. 5000 A - 10000 A

72: What is the approximate value of maximum forward voltage for the visible-light LED?

A. 0.9 v

B. 1.2 v

C. 1.8 v

D. 2.3 v

73: For modulating a carrier frequency 0f1 MHz and peak voltage of 40 volts, 8 message signal with a frequency of 20 KHz and peak voltage 20 volts is used. What is the modulation index and the side bands produced?

A. Modulation index =1 Side bands =1040 kHZ, 960 kHz

B. Modulation index =1 Side bands = 1000 kl-IZ, 960 kHz

C. Modulation index = 0.5 Side bands =1040 kHZ, 960 kHz

D. Modulation index = 0.5 Side bands = 1020 kHZ, 980 kHz

74: Consider two wires of same material and same length. What is the ratio of their radii, if their resistances are 10 Q and 20 0, respectively?

A. 1:2

B. v2zv3

C. v2:1

D. 121/2

75: When placed in a polarimeter, a 600 mm long tube containing 120 cc of sugar solution produces a rotation of 15°. What is the quantity of sugar contained in the solution. if the specific rotation is 60°?

A. 0 3 g

B. 0 5 g

C. O 9 g

D. 0 6 g

76: Which of the following quantities is not scalar?

A. Electric force

B. Electric potential

C. Both options a and b are scalar.

D. Neither option 8 nor option b is scalar.

77: Nina runs up a staircase of 60 steps in 15 seconds. If Nina's weight is 48 kg and the height of each step is 15 cm, then what is Nina's power? Consider that 9: 10 [TI/$2.

A. 288 w

B. 312 w

C. 260 w

D. 320 w

78: Which types of spectrum is obtained when a pure green glass plate is placed in the path of white light?

A. Line absorption spectrum

B. Band absorption spectrum

C. Continuous absorption spectrum

D. None of the above.

79:

In the given image, what is the level of output impedance for the given system?

A. 32 KOhm

B. 36 KOhm

C. 40 KOhm

D. 44 KOhm

80: In relation to extrinsic semiconductors, which two of the following options are the pentavalent dopants?

A. Indium (In)

B. El Arsenic (As)

C. Antimony (Sb)

D. Boron (b)

81: Which of the following options are the correct characteristics of electromagnetic waves?

A. Accelerated charges produce electromagnetic waves.

B. Electromagnetic waves require a medium for propagation.

C. Electromagnetic waves are deflected by the electric and magnetic field.

D. Energy is equally distributed between the electric and magnetic field in electromagnetic waves,

82: Which of the following statements are correct about a nucleus?

A. The nuclear mass (M) is always equal to the mass of its constituents(Zm).

B. Ii Mass of the neutron is almost same as that of the proton

C. Isotopes are nuclides that have same atomic number but different neutron number.

D. For mass number ranging from 30 to 170. the binding energy per nucleon is nearly constant. and is about 12 MeV/nucleon.

83:

Which of the following options are the correct differences between the vacuum tube devices and the semiconductor devices?

A.

Vacuum tubes are more eff‌icient as compared to the semiconductor devices.

B.

Vacuum tubes are current driven devices while semiconductors are voltage controlled devices.

C.

Vacuum tubes cannot be used as integrated circuits while semiconductors can be used as
integrated circuits.

D.

Vacuum tubes are temperature sensitive devices while semiconductors are not.

84: Which of the following flowing layers of atmosphere exist only during the day time?

A. Troposphere

B. F2 (T hermosphere)

C. D (part of stratosphere)

D. E (part of Stratosphere)

85: Which two of the following options are biaxial crystals?

A. Quartz

B. Aragonite

C. Calcite

D. Mica

86: Which of the following statements are correct about the full wave bridge rectifier?

A. It uses only two junction diodes.

B. It does not require any transformer.

C. In full wave bridge rectifier. the value of ripple factor is 121%.

D. It has an efficiency of 81.2%.

87: Which of the following statements are correct about the amplitude modulation?

A. It is bandwidth eff‌icient.

B. AM waves are not affected due to noise.

C. AM waves are ineff‌icient in power usage.

D. These waves can travel longer distances.

88: Injured cartilage might heal more quickly if a treatment were discovered that would __________.

A. Lines most of the respiratory tract

B. Stimulate blood vessels to develop within cartilage

C. Multicellular simple gland

D. Blast cells are undifferentiated, actively dividing cells.

89: The angular size of the smallest features that a telescope can see is called the angular ________.

A. Resolution

B. Interferometry

C. Focus

D. Radio waves

90: When we move around through space just a little bit, we are moving _____.

A. Stays the same

B. Mostly through time and only a little bit through space

C. Its mass times the speed of light squared

D. None of these

91: Slow moving vehicles must display ___________ emblem at the rear to warn of their low speed.

A. A red square

B. A yellow triangular

C. An orange triangular

D. None of these

92: Solid-state storage is quickly replacing forms of _____ on small devices like the ipod.

A. Direct

B. Magnetic storage

C. Permanently

D. Internet access

93: Strictly speaking, the light that meets and passes through a pane of window glass _________.

A. Is not the same light that emerges

B. Gains energy

C. Is largely converted to heat in the glass

D. Is the same light that emerges

94: The net charge on an energized capacitor is normally _________.|

A. Positive

B. Zero

C. Either positive or negative

D. Negative

95: The unit of electric potential or electromotive force is the _____. volt ohm ampere franklin

A. Volt

B. Ohm

C. Ampere

D. Franklin

96: When it's winter in the united states, in argentina it is _____.

A. Spring

B. Summer

C. Fall

D. Also winter

97: When we say charge is conserved, we mainly mean that charge can be _________.

A. Transferred without loss like money in a bank.

B. Neutron

C. Mutually repelled toward its corners

D. Electric field and gravitational field

98: The velocities of seismic waves traveling from earthquake foci ________.

A. Are uniform throughout all layers of Earth

B. Decrease at a constant rate with depth

C. Increase at a constant rate with depth

D. Generally increase with depth, but occasionally make abrupt jumps

99: When a projectile achieves escape speed from earth, it _______.

A. Forever leaves Earth's gravitational field.

B. Outruns the influence of Earth's gravity, but is never beyond it.

C. Comes to an eventual stop, returning to Earth at some future time.

D. All of the above.

100: A water wave travels across a 42-meter wide pond in 7.0 seconds. the speed of the wave is _____.

A. 6.0 waves/second

B. Depends on the speed of the wave

C. 0.25 waves/second

D. 8.0 waves/second

E. 4.0 waves/second

Physics MCQs

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