ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 2

Which of the following is not an example of intertial frame

Question # 3

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 4

The Einstein's changes in length, mass and time are not observed in common life because

Question # 5

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 6

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 7

A black body is

Question # 8

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 9

Photoelectric effect takes place with a photon of:

Question # 10

Electromagnetic -radiation means:

Question # 11

The length contraction happens only

Question # 12

According to the Max plank, energy is redialed or absorbed in

Question # 13

The unit of work function is:

Question # 14

The energy of photon 'E' is proported to

Question # 15

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
6 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
7 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
8 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
9 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
10 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v

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