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

Question # 2

Momentum is a parameter associated with

Question # 3

The value of threshold frequency for different metals is

Question # 4

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 5

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 6

Strictly speaking, the earth is:

Question # 7

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

Question # 8

The value of the plank's constant 'h' is given by

Question # 9

Photocell is a device which converts

Question # 10

Wien's constant is measured in:

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

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

Question # 13

From the theory of relativity, momentum p of the photon is related to energy as

Question # 14

The general theory of relativity treats problems involving

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
2 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
3 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
4 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
5 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
8 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
9 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
10 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass

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