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 positron was discovered by:

Question # 2

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

Question # 3

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

Question # 4

An intertial frame of reference is a frame of reference which is

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The unit of work function is:

Question # 11

The year when A.H. compton was awarded Nobel Prize is:

Question # 12

Which of the following phenomenon proves the particle nature of light

Question # 13

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

Question # 14

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

Question # 15

de-Broglies hypthesis was experimentally verified by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
3 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
4 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
5 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
6 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
7 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
8 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
9 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson

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