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

There is no way to detect:

Question # 2

Which of the following is not an example of intertial frame

Question # 3

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

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

Momentum is a parameter associated with

Question # 6

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

Question # 7

The Stephen-Boltzmann law for the black body radiation is given by

Question # 8

At the temperature, a body emits radiation which is principally

Question # 9

Practically the quantity v/c is always:

Question # 10

Intensity of light determines the:

Question # 11

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

Question # 12

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 13

The mass of an object will be doubled at speed

Question # 14

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
3 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
4 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
5 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
6 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
7 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
8 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
10 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932

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