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 whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 2

The special theory of relativity treats problems invoving

Question # 3

Compton shift refers to:

Question # 4

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 5

The unit of work function is:

Question # 6

The inside cavity of the black body is

Question # 7

There is no way to detect:

Question # 8

The existence of position was predicted by Dirace in

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

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 # 11

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 12

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

Question # 13

The positron was discovered by:

Question # 14

When a position comes close to an electron they annihilate into

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
2 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
3 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
4 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
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
7 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
8 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
9 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
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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