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

Practically the quantity v/c is always:

Question # 2

At the temperature, a body emits radiation which is principally

Question # 3

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

Question # 4

The special theory of relativity treats problems invoving

Question # 5

As the light shines on the metal surface, the electrons are ejected

Question # 6

Photocell is a device which converts

Question # 7

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

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

Due to relative motion of observer and the frame of reference of events, time always:

Question # 10

According to the special theory of relativity, a moving clock

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 13

According to the Max plank, energy is redialed or absorbed in

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

If a material object moves with the speed of light 'C' its mass becomes

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
2 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
3 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
4 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 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
7 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
8 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
9 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
10 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate

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    hasnain

    30 May 2018

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