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

Momentum is a parameter associated with

Question # 2

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

Question # 3

Davision and Germer performed experiment to verify

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

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

Question # 6

A black body is

Question # 7

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

Question # 8

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

Question # 9

The value of threshold frequency for different metals is

Question # 10

The energy of photon 'E' is proported to

Question # 11

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 12

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

Question # 13

The special theory of relativity treats problems invoving

Question # 14

the dilation of time applies to the timing processes which are:

Question # 15

The existence of position was predicted by Dirace in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
2 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
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 positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
5 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
6 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
9 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
10 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass

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