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

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

Question # 2

When a platinum wire is heated, it appears white at

Question # 3

The mass of an object will be doubled at speed

Question # 4

The length contraction happens only

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The inside cavity of the black body is

Question # 11

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 12

An intertial frame of reference is a frame of reference which is

Question # 13

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

Question # 14

The value of threshold frequency for different metals is

Question # 15

Wien's constant is measured in:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
3 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
4 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
5 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
6 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
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 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
9 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
10 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J

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