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 emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 2

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

Question # 3

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

Question # 4

There is no way to detect:

Question # 5

Electromagnetic radiation or photons interact with matter in

Question # 6

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 7

The energy of a photon is represented by

Question # 8

A photon is considered to have

Question # 9

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

Question # 10

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 11

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 # 12

Strictly speaking, the earth is:

Question # 13

When a platinum wire is heated, it appears yellow at

Question # 14

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 15

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
2 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
3 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
4 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
5 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
6 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
7 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
8 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
9 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
10 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these

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