ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Position was discovered by Carl Anderson in

Question # 2

A black body is

Question # 3

Which one of the following physical quantities changes with relativistic speed

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

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

Question # 6

Compton was awarded Nobel prize in physics in

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

When a platinum wire is heated, it appears dull red at about

Question # 9

The energy of photon 'E' is proported to

Question # 10

Pair production is the phenomenon in which

Question # 11

Due to relative motion of observer and the frame of reference of events, time always:

Question # 12

At the temperature, a body emits radiation which is principally

Question # 13

Absolute motion cannot be detected

Question # 14

When a platinum wire is heated, it appears orange red at

Question # 15

The energy of a photon is represented by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
3 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 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
5 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
6 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
7 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
8 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
9 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
10 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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