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 unit of work function is:

Question # 2

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

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

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

Question # 5

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 6

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 9

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 # 10

Davision and Germer performed experiment to verify

Question # 11

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

Question # 12

Which of the following phenomenon proves the particle nature of light

Question # 13

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

Question # 14

Compton was awarded Nobel prize in physics in

Question # 15

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
2 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 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
4 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
5 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
6 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
7 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 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
10 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these

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