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

Question # 2

Intensity of light determines the:

Question # 3

0.1 kg mass will be equivalent to the energy

Question # 4

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

Question # 5

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 # 6

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

Question # 7

When a platinum wire is heated, it appears orange red at

Question # 8

According to the special theory of relativity, a moving clock

Question # 9

An inertial frame is that frame in which

Question # 10

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

Question # 11

With the help of 50 K v electron microscope, a resolution of

Question # 12

According to the special theory of relativity, time is

Question # 13

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 14

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
2 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
3 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
4 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
5 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
6 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
7 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
8 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
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 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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