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

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

Question # 2

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 3

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 4

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

Question # 5

When a platinum wire is heated, it appears white at

Question # 6

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

Question # 7

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

Question # 8

Which one of the following physical quantities changes with relativistic speed

Question # 9

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

Question # 10

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 11

The inside cavity of the black body is

Question # 12

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 13

According to the special theory of relativity, a moving clock

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
2 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
3 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
4 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
5 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
6 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
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
9 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
10 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these

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