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

Photoelectrons are emitted when ultraviolet light falls on:

Question # 2

A black body is

Question # 3

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

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

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

Question # 6

A particle having mass and charge equal to that of an electron is called:

Question # 7

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

Question # 8

Intensity of light determines the:

Question # 9

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

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

The energy of photon 'E' is proported to

Question # 12

Which one of the following physical quantities changes with relativistic speed

Question # 13

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

Question # 14

Position was discovered by Carl Anderson in

Question # 15

the dilation of time applies to the timing processes which are:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
2 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
3 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
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 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
6 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
7 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
8 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
10 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them

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