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

Absolute motion cannot be detected

Question # 2

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 3

Which of the following is not an example of intertial frame

Question # 4

Compton was awarded Nobel prize in physics in

Question # 5

When the atomic particle are moving with velocities approaching that of light:

Question # 6

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

Question # 7

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

Question # 8

The existence of position was predicted by Dirace in

Question # 9

The year when A.H. compton was awarded Nobel Prize is:

Question # 10

Newton's law of motion do not hold in

Question # 11

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

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 14

When a platinum wire is heated, it appears yellow at

Question # 15

The positron was discovered by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
2 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
3 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
4 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
5 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
6 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
7 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
8 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
9 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
10 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927

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