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

Question # 2

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

Question # 3

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

Question # 4

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 5

Strictly speaking, the earth is:

Question # 6

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 7

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

Question # 8

Electromagnetic -radiation means:

Question # 9

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

Question # 10

A non-inertial frame of reference is one, in which

Question # 11

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 12

The energy of a photon is represented by

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
2 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
3 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
4 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
5 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
8 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
9 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
10 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these

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