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

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

Question # 2

The general theory of relativity treats problems involving

Question # 3

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 4

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

Question # 5

The length contraction happens only

Question # 6

The value of threshold frequency for different metals is

Question # 7

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

Question # 8

The inside cavity of the black body is

Question # 9

The Stephen-Boltzmann law for the black body radiation is given by

Question # 10

The idea of quantization of energy was proposed by:

Question # 11

The concept of direction is purely:

Question # 12

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

Question # 13

Momentum is a parameter associated with

Question # 14

Wien's constant is measured in:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
2 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
3 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
4 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
5 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
6 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
7 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
8 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these

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