ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 5

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 6

When a platinum wire is heated, it appears yellow at

Question # 7

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

Question # 8

Which of the following is not an example of intertial frame

Question # 9

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

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

Victor de-Brogile received the Nobel prize in physics in

Question # 12

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 13

Photocell is a device which converts

Question # 14

The unit of work function is:

Question # 15

Wave nature of particle was proposed by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
2 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
3 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
4 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
5 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
6 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
7 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
8 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
9 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
10 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1

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  • hasnain

    hasnain

    30 May 2018

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