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

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 # 2

The energy of a photon is represented by

Question # 3

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

Question # 4

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 5

The inside cavity of the black body is

Question # 6

A particle having mass and charge equal to that of an electron is called:

Question # 7

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 8

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 9

When a platinum wire is heated, it appears dull red at about

Question # 10

Electromagnetic -radiation means:

Question # 11

de-Broglies hypthesis was experimentally verified by

Question # 12

Which of the following is not an example of intertial frame

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
2 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
3 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
5 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
6 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 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
9 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
10 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these

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