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 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:

Question # 2

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

Question # 3

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 4

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 5

A photon is considered to have

Question # 6

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 7

The special theory of relativity is based on:

Question # 8

The special theory of relativity treats problems invoving

Question # 9

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

Question # 10

With the help of 50 K v electron microscope, a resolution of

Question # 11

Converse of pair production is known as

Question # 12

Which of the following is not an example of intertial frame

Question # 13

S.I. unit of planks constant is

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

Compton was awarded Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
2 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
3 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
4 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
5 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
6 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
7 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 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

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