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

When a platinum wire is heated, it appears yellow at

Question # 2

0.1 kg mass will be equivalent to the energy

Question # 3

The nature of radiations emitted by a hot body depends upon its:

Question # 4

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

Question # 5

The photon of radio-waves has energy of about

Question # 6

The idea of quantization of energy was proposed by:

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

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

Question # 9

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

Question # 10

Electromagnetic -radiation means:

Question # 11

the dilation of time applies to the timing processes which are:

Question # 12

When a platinum wire is heated, it appears white at

Question # 13

The value of the Stephen's constant for black body radiations is given by

Question # 14

Photoelectric effect takes place with a photon of:

Question # 15

A non-inertial frame of reference is one, in which

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
3 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
4 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
5 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
6 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
7 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
8 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
9 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
10 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates

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