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 energy of photon 'E' is proported to

Question # 2

When a platinum wire is heated, it appears yellow at

Question # 3

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

Question # 4

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

Question # 5

Newton's law of motion do not hold in

Question # 6

Pair production is the phenomenon in which

Question # 7

According to the special theory of relativity

Question # 8

When a platinum wire is heated, it appears dull red at about

Question # 9

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

Question # 10

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 11

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 12

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

Question # 13

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

Question # 14

de-Broglies hypthesis was experimentally verified by

Question # 15

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
2 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)
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 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
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
10 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

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