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

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 2

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

Question # 3

The value of the plank's constant 'h' is given by

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

The Stephen-Boltzmann law for the black body radiation is given by

Question # 6

An inertial frame is that frame in which

Question # 7

The special theory of relativity is based on:

Question # 8

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 9

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 10

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

Question # 11

The value of threshold frequency for different metals is

Question # 12

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

Question # 13

When a platinum wire is heated, it appears yellow at

Question # 14

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 15

Absolute motion cannot be detected

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
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 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 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
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928

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