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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

When a position comes close to an electron they annihilate into photons such that

Question # 6

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

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

Which of the following is not an example of intertial frame

Question # 9

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

Question # 10

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

Photoelectric effect takes place with a photon of:

Question # 13

Due to relative motion of observer and the frame of reference of events, time always:

Question # 14

Strictly speaking, the earth is:

Question # 15

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
3 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
4 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
5 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
6 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
9 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
10 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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