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

In order to produce pair production, a photon must have a energy

Question # 2

When a platinum wire is heated, it appears yellow at

Question # 3

The concept of direction is purely:

Question # 4

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 5

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

Question # 6

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

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 9

When platinum wire is heated, it appears cherry red at

Question # 10

Photoelectric effect takes place with a photon of:

Question # 11

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 12

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

Question # 13

An intertial frame of reference is a frame of reference which is

Question # 14

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

Question # 15

Compton studied the scattering of x-rays by loosely bound electrons from:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
2 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
3 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
5 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
6 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
7 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
10 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these

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