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

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

Question # 2

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

Question # 3

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

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

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

Question # 6

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 7

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

Question # 8

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

Question # 9

Wave nature of particle was proposed by

Question # 10

The concept of direction is purely:

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

When a platinum wire is heated, it appears dull red at about

Question # 13

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

Question # 14

The length contraction happens only

Question # 15

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
2 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
3 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
4 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
5 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
6 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
7 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
8 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
9 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
10 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these

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