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

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

Question # 2

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

Question # 3

the symbol to be used in relativity problems denotes:

Question # 4

Strictly speaking, the earth is:

Question # 5

Photocell is a device which converts

Question # 6

Newton's law of motion do not hold in

Question # 7

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

Question # 8

The length contraction happens only

Question # 9

Which of the following phenomenon proves the particle nature of light

Question # 10

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 11

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 12

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

Question # 13

Due to relative motion of observer and the frame of reference of events, time always:

Question # 14

The general theory of relativity treats problems involving

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
3 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
4 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 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
8 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
9 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
10 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v

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