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

Momentum is a parameter associated with

Question # 2

A photon is considered to have

Question # 3

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

Question # 4

Pair production is the phenomenon in which

Question # 5

Strictly speaking, the earth is:

Question # 6

A black body is

Question # 7

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

Question # 8

Intensity of light determines the:

Question # 9

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

Question # 10

The energy of photon 'E' is proported to

Question # 11

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

Question # 12

In photoelectric effect the energy of ejected electrons depend on

Question # 13

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 14

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

Question # 15

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
3 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
5 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
6 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
10 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

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