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

Victor de-Brogile received the Nobel prize in physics in

Question # 2

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

Question # 3

The mass of an object will be doubled at speed

Question # 4

According to the special theory of relativity

Question # 5

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

Question # 6

The concept of direction is purely:

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

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

Question # 9

An inertial frame is that frame in which

Question # 10

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

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 13

When a platinum wire is heated, it appears orange red at

Question # 14

Compton shift refers to:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
2 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
3 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
4 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
5 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
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 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
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
10 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

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