ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

According to the special theory of relativity, a moving clock

Question # 2

When a position comes close to an electron they annihilate into

Question # 3

Pair production is the phenomenon in which

Question # 4

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 5

the dilation of time applies to the timing processes which are:

Question # 6

Which of the following is not an example of intertial frame

Question # 7

The special theory of relativity is based on:

Question # 8

If a material object moves with the speed of light 'C' its mass becomes

Question # 9

The special theory of relativity is based on the

Question # 10

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

Question # 11

The inside cavity of the black body is

Question # 12

Wave nature of particle was proposed by

Question # 13

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 14

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 15

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

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ECAT Chapter 19 Important MCQ's

Sr.# Question Answer
1 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
2 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
3 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
4 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
5 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
6 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
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 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
9 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
10 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2

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