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

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

Question # 2

Absolute motion cannot be detected

Question # 3

The value of the plank's constant 'h' is given by

Question # 4

Wien's constant is measured in:

Question # 5

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

Question # 6

the dilation of time applies to the timing processes which are:

Question # 7

In order to produce pair production, a photon must have a energy

Question # 8

Strictly speaking, the earth is:

Question # 9

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

Question # 10

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

Which of the following is not an example of intertial frame

Question # 13

The energy of photon 'E' is proported to

Question # 14

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

Question # 15

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
2 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
3 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
4 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all 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 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
9 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
10 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2

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