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 mass of an object will be doubled at speed

Question # 2

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

Question # 3

Intensity of light determines the:

Question # 4

A photon is considered to have

Question # 5

An inertial frame is that frame in which

Question # 6

The year when A.H. compton was awarded Nobel Prize is:

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

Photocell is a device which converts

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Compton shift refers to:

Question # 13

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

Question # 14

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 15

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
2 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
3 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
4 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
5 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
6 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
7 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
8 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
9 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
10 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates

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