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

As the light shines on the metal surface, the electrons are ejected

Question # 2

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 3

When a position comes close to an electron they annihilate into photons such that

Question # 4

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 5

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

Question # 6

Photoelectric effect takes place with a photon of:

Question # 7

Intensity of light determines the:

Question # 8

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

Question # 9

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 10

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 11

There is no way to detect:

Question # 12

S.I. unit of planks constant is

Question # 13

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 14

Absolute motion cannot be detected

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
2 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
5 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
6 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
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
9 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
10 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these

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