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

Electromagnetic radiation or photons interact with matter in

Question # 2

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

Question # 3

Practically the quantity v/c is always:

Question # 4

When the atomic particle are moving with velocities approaching that of light:

Question # 5

The special theory of relativity treats problems invoving

Question # 6

Compton shift refers to:

Question # 7

Photoelectrons are emitted when ultraviolet light falls on:

Question # 8

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 9

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 10

In order to produce pair production, a photon must have a energy

Question # 11

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
2 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
3 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
4 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
5 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
6 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
7 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
10 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these

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