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

Question # 2

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

Question # 3

The special theory of relativity is based on:

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

According to the special theory of relativity, time is

Question # 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

Question # 7

The inside cavity of the black body is

Question # 8

When a position comes close to an electron they annihilate into photons such that

Question # 9

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 10

When platinum wire is heated, it appears cherry red at

Question # 11

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 # 12

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

Question # 13

Photoelectrons are emitted when ultraviolet light falls on:

Question # 14

When a position comes close to an electron they annihilate into

Question # 15

Pair production is the phenomenon in which

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
3 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
4 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
5 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
7 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
8 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
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 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency

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