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Quiz on Modern Physics

Total questions: 86

Worksheet time: 46mins

Name
Class
Date
1.

The velocity of light in an inertial frame of reference S and S is c and c. If frame S moves at v velocity with respect to frame S along X-axis

a)

c = c - v

b)

c = c

c)

c = c + v

d)

v = c + c

2.

Clock ticks slowly in moving frame compared to still frame what is this event called?

a)

Length contraction

b)

Relativity of mass

c)

Time dilation

d)

Time contraction

3.

An astronaut changed 60 LY distance less than 48 LY distance using his velocity. This requires his velocity to be [R.B.-15]

a)

More than 0.6c

b)

Less than 0.6c

c)

More than 0.8c

d)

Less than 0.8c

4.

At what speed, the length of a rocket will be one-fourth of its initial length?

a)

3 108 m.s-1

b)

2.99 108 m.s-1

c)

2.92108 m.s-1

d)

2.90108 m.s-1

5.

The relative mass of a particle with m0 rest mass is m, the kinetic energy of the particle is 3 times more than its potential energy. Which of the following relations is correct?

a)

m = 4m0

b)

m = 3m0

c)

m = 2m0

d)

m = m0

6.

What is the equivalent energy of 2 a.m.u mass?

a)

1.494 10-10 J

b)

1.494 10-10 eV

c)

2.9881010 J

d)

2.08810-10 eV

7.

Equivalent energy of 1amu mass

a)

9.30 108eV

b)

9.32 108eV

c)

9.35 108eV

d)

9.38 108eV

8.

Equivalent energy of 1amu mass?

a)

934 J

b)

934 MeV

c)

934 eV

d)

934 kg

9.

E = h law was given by

a)

Faraday

b)

Einstein

c)

Planck

d)

Newton

10.

E T4 law was given by

a)

Raleigh-Jeans

b)

Einstein

c)

Planck

d)

Newton

11.

If a material particle moves at light speed then its mass will be

a)

Half

b)

Zero

c)

Double

d)

Infinite

12.

Which is radiated quanta?

a)

Photon

b)

Proton

c)

Neutron

d)

Electron

13.

is known as?

a)

Dirac's Constant

b)

Planck's constant

c)

Compton constant

d)

De Broglie constant

14.

Relation between wavelength and photon energy E

a)

E =

b)

E =

c)

E =

d)

E =

15.

If the wavelength of electromagnetic wave in vacuum is 0.03 cm, what is the frequency of the wave? [R.B.-15]

a)

10-12 Hz

b)

1010 Hz

c)

1012 Hz

d)

1014 Hz

16.

Which order is correct for the wavelength of light?

a)

R > Y > V

b)

R < Y < V

c)

V > R < Y

d)

Y > R < V

17.

What is the energy of a photon with 6650 10-10 m wavelength? [R.B.-15]

a)

4.4 10-40 J

b)

9.97 10-28 J

c)

2.99 10-19 J

d)

2.99 1049 J

18.

What is the energy of an electromagnetic wave with 1 Å wavelength?

a)

2 1015J

b)

2 1016J

c)

2 1017J

d)

2 1018J

19.

Einstein's mass-energy equation is

a)

E0 = m0c2

b)

E = hv

c)

E0 = mc2

d)

E = mc2

20.

Discoverer of X-ray

a)

Max Planck

b)

Rontgen

c)

Maxwell

d)

Einstein

21.

If the wavelength of x-ray is 3 Å then its frequency is

a)

1015 Hz

b)

1016 Hz

c)

1018 Hz

d)

1021 Hz

22.

The relation between stopping potential V and velocity of electron v

a)

v =

b)

v =

c)

v =

d)

v =

23.

If a photon of 3 eV energy strikes on a metallic surface of 1.5 eV work function, then what is the maximum kinetic energy of emitted electron?

a)

0.5 eV

b)

1.5 eV

c)

2 eV

d)

4.5 eV

24.

By increasing light intensity in photoelectric effect

a)

Incidence photon increases

b)

Kinetic energy of electron increases

c)

Number of photons stay same

d)

Emitted electrons decrease

25.

Threshold wavelength of sodium is 6800 Å. How much is its work function?

a)

2.82 1030 eV

b)

2.93 1019 eV

c)

1.83 1010 eV

d)

1.83 eV

26.

Threshold frequency of a surface is 8 1014Hz. If a light with 2400 Å wavelength strikes on that surface then the maximum kinetic energy of the emitted electron

a)

1.86 J

b)

2.98 1019 J

c)

8.29 1019 J

d)

13.59 1019 J

27.

According to De Broglie's proposal, which of the following graphs can determine the Broglie wavelength?

4 lines
28.

What will be the De Broglie wavelength if kinetic energy of electron is 500 eV?

a)

0.55 Å

b)

1.55 Å

c)

2.55 Å

d)

3.55 Å

29.

The following figure shows Compton effect. [Dj.B.-15] What is the wavelength of scattered photon?

a)

3.26 10-13 m

b)

3 10-11 m

c)

3.03 10-11 m

d)

2.43 10-12

30.

Electron emission is more in high temperature. This is an instantaneous event. Emission electron increases with more light intensity. Which of the following is correct?

a)

i and ii

b)

ii and iii

c)

i and iii

d)

i, ii and iii

31.

Process related with particle nature: Photoelectric effect, Compton effect, Doppler effect. Which of the following is correct?

a)

i and ii

b)

ii and iii

c)

i and iii

d)

i, ii and iii

32.

If a body travel in the speed of light, then with respect to a still frame it will have: Infinite mass, Infinite length, Infinite time. Which of the following is correct?

a)

i and ii

b)

ii and iii

c)

i and iii

d)

i, ii and iii

33.

In case of theory of relativity: Clock in motion ticks faster than clock at rest, Length of a body in motion is less than its rest length, mass of a moving body is more than its rest mass. Which of the following is correct?

a)

i and ii

b)

ii and iii

c)

i and iii

d)

i, ii and iii

34.

In case of photon: Rest mass of photon is zero, Photon energy, E = h, Photon velocity is 3 108 ms-1. Which of the following is correct?

a)

i and ii

b)

ii and iii

c)

i and iii

d)

i, ii and iii

35.

Heisenberg's uncertainty principle is: x P, P E, E t. Which of the following is correct?

a)

i and ii

b)

i and iii

c)

ii and iii

d)

i, ii and iii

36.

Photoelectric effect: Is an instantaneous event, Isn't affected by temperature, Different materials have different threshold frequency. Which of the following is correct?

a)

i and ii

b)

i and iii

c)

ii and iii

d)

i, ii and iii

37.

How much is photon energy?

a)

2 1019 J

b)

3 1019 J

c)

4 1019 J

d)

5 1019 J

38.

How much is the work function of sodium?

a)

2 1019 J

b)

2.235 1019 J

c)

2.925 1019 J

d)

3.5 1019 J

39.

How long is the half-life of X?

a)

0.693

b)

6.93

c)

69.3

d)

693

40.

Which of the following is correct?

a)

Decay rate of both X and Y was equal initially

b)

Decay rate of both X and Y is always equal

c)

Decay rate of Y is much more than decay rate of X

d)

Decay rate of X is much more than decay rate of Y

41.

How much is the energy of the mentioned photon?

a)

1.989 1016 J

b)

2.89 1016 J

c)

19.89 1016 J

d)

91.98 1016 J

42.

Photon mentioned in the stem has: Velocity of 3 108 ms1, Wavelength of 10Å, Momentum of 6.63 1025 kgms1. Which of the following is correct?

a)

i and ii

b)

i and iii

c)

ii and iii

d)

i, ii and iii

43.

Which of the following is correct?

a)

i and ii

b)

i and iii

c)

ii and iii

d)

i, ii and iii

44.

The length of a rocket is 100 m on the earth. When it was flying a person on the earth measure its length as a 99 m. What is the speed of the rocket?

a)

10.2 107 ms1

b)

8.2 107 ms1

c)

6.2 107 ms1

d)

4.2 107 ms1

45.

What is the wavelength for De Broglie wave?

a)

=

b)

=

c)

=

d)

=

46.

A proton is moving with a velocity th of velocity of light, what will be the De Broglie wavelength associated with proton?

a)

1.64 1014 m

b)

2.64 1014 m

c)

4.26 1014 m

d)

6.42 1014 m

47.

Frame S2 is moving away from the stationary Frane S1 with a constant speed ms-1. If the observar emits a flash of light and measures its speed as cms1, then what will the observer of S2 measure the speed of this light?

a)

ms1

b)

(C ) ms1

c)

ms1

d)

C ms1

48.

What is the mass of a 70 kg man in a space rocket travelling at 0.8 c from us as measured from Earth?

a)

110.7 kg

b)

116.7 kg

c)

120.7 kg

d)

123.7 kg

49.

Which of the following is correct?

a)

i & ii

b)

i & iii

c)

ii & iii

d)

i, ii & iii

50.

What is the frequency of photon?

a)

2.2 1022 Hz

b)

2.41 1022 Hz

c)

3.1 1022 Hz

d)

3.53 1022 Hz

51.

What is the wavelength of photon?

a)

1.24 1014 m

b)

1.50 1014 m

c)

1.75 1014 m

d)

2.3 1014 m

52.

Which is the radiation quanta?

a)

Photon

b)

Proton

c)

Neutron

d)

Electron

53.

Which one is correct?

a)

i & ii

b)

i & iii

c)

ii & iii

d)

i, ii & iii

54.

In compton effect the wavelength of photon increases after collision with electron-explain why?

a)

Due to collision the frequncy of the photon increases.

b)

Due to collision the energy of the photo increases

c)

Due to collision the energy of the photon decreases

d)

Due to collision the velocity of the photon decreases

55.

Which graph represents the maximum K.E of electron VS frequency of incident light for photo electric effect?

a)
b)
c)
d)
56.

The work function of a material is 1.85 eV. Its threshold frequency will be

a)

3 1014 Hz

b)

4.46 1014 Hz

c)

4 1013 Hz

d)

3 1024 Hz

57.

What will be the relative velocity of two photons approaching towards each other with the velocity C?

a)

C

b)

2C

c)

3C

d)

0

58.

What will be the work function of sodium if its threshold frequency is 6800 10-10 m?

a)

1.83 eV

b)

2.25 eV

c)

2.45 eV

d)

1.55 eV

59.

If a High of frequency is incident upon it, then photoclectric effect will take place if

a)

< /2

b)

2o

c)

< 0

d)

0

60.

Kinetic energy of an electron is 3 times what is tis De-Broglie wavelength?

a)
b)
c)
d)

3

61.

When a body moves with the velocity of light then its mass becomes

a)

Zero

b)

Infinity

c)

will static

d)

None of them

62.

What is the equivalent energy of 1 amu mass in electron volt?

a)

9.33 108 eV

b)

10.5 108 eV

c)

9.5 108 eV

d)

9.15 108 eV

63.

"The wavelength of blackbody radiation depends on the temperature of the body". This statement goes to

a)

Kirchhoff

b)

Planck

c)

Wien

d)

Raleigh

64.

Which of the following one is equivalent to the unit of length?

a)
b)
c)
d)

none

65.

Which one is the frequency of photon having energy 100 MeV?

a)

2.4 1023 Hz

b)

4.2 1023 Hz

c)

4.2 1022 Hz

d)

2.4 1022 Hz

66.

A source of light is moving towards an observed with a velocity . What will appear to the observer the velocity of light?

a)

c

b)

c

c)

c

d)

c

67.

Electron volt is the unit of

a)

Charge

b)

Intensity

c)

Work

d)

Current

68.

The results of Lorentz transformation are

a)

i. Length contraction

b)

ii. Relativity of Mass

c)

iii. time dilation

d)

Which one is correct?

69.

What is the energy of a monochromatic X-ray of wavelength 1Å?

a)

2 1015 J

b)

2 1016 J

c)

2 10-17 J

d)

2 1018 J

70.

If the wavelength of a X-ray is 3Å then what is its frequency?

a)

1015 Hz

b)

1016 Hz

c)

1018 Hz

d)

1021 Hz

71.

Mass of which particle is zero?

a)

electron

b)

photon

c)

proton

d)

meson

72.

The compton wavelength is maximum when the angle of photon is

a)

0

b)

45

c)

90

d)

180

73.

The stationary mass of a particle is m8 whereas its kinetic mass is m. Its kinetic mass is 3 times its stationary mass. Which is correct?

a)

m = 4mº

b)

m = 3mº

c)

m = 2mº

d)

m = mº

74.

According to De Broglie's proposal from which of the following graph De Broglie wave length can be determined?

a)
b)
c)
d)
75.

Slope of straight line AB is

a)

2h

b)

h

c)
d)
76.

If the co-ordinates of point B is (4 1015, 12) Which one is correct?

a)

i & ii

b)

i & iii

c)

ii & iii

d)

i, ii & iii

77.

By increasing light intensity in photoelectric effect

a)

incidence photon increases

b)

kinetic energy of electron increases

c)

Number of photons stay same

d)

Emitted electrons decrease

78.

If a material particle moves at light speed then its mass will be

a)

Half

b)

Zero

c)

Double

d)

Infinite

79.

At what speed, the length of a rocket will be one-fourth of its initial length?

a)

3 108 m/sec

b)

2.99 108ms1

c)

2.92 108ms1

d)

2.90 108ms1

80.

What is the unit of work function?

a)

Newton

b)

Joule

c)

Watt

d)

Volt

81.

Threshold wave length of sodium is 6800 Å. How much is it works function?

a)

2.82 1030 eV

b)

2.93 10-19 eV

c)

2.83 1010 eV

d)

1.83 eV

82.

Process related with particle nature Which one of the following is correct?

a)

i & ii

b)

ii & iii

c)

i & iii

d)

i, ii & iii

83.

Heisenberg's uncertainty principle is Which one of the following is correct?

a)

i & ii

b)

i & iii

c)

ii & iii

d)

i, ii & iii

84.

Photoelectric effect Which one of the following is correct?

a)

i & ii

b)

i & iii

c)

ii & iii

d)

i, ii & iii

85.

Mass of which of the following is zero?

a)

Electron

b)

photon

c)

proton

d)

II-meson

86.

If an electron is in motion with velocity 0.99 C then what is its relative mass? [rest mass of electron is 9.1 10-31 kg]

a)

9.1 1031 kg

b)

50.5 1031 kg

c)

60.2 1031 kg

d)

64.5 1031 kg

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