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

When a platinum wire is heated, it appears yellow at

Question # 2

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 3

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 4

Electromagnetic -radiation means:

Question # 5

Converse of pair production is known as

Question # 6

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 7

The length contraction happens only

Question # 8

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

Question # 9

According to the special theory of relativity, time is

Question # 10

The unit of work function is:

Question # 11

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The mass of an object will be doubled at speed

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
4 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
5 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
9 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
10 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)

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