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

Pair production is the phenomenon in which

Question # 2

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

Question # 3

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 4

The length contraction happens only

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

Electromagnetic radiation or photons interact with matter in

Question # 7

The concept of direction and position are purely

Question # 8

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

Question # 9

The Einstein's changes in length, mass and time are not observed in common life because

Question # 10

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 11

Position was discovered by Carl Anderson in

Question # 12

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 13

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

Question # 14

As the light shines on the metal surface, the electrons are ejected

Question # 15

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
4 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
5 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
6 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
7 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
8 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
9 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
10 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927

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