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

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

Question # 2

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

Question # 3

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

Question # 4

Photocell is a device which converts

Question # 5

According to the special theory of relativity

Question # 6

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 7

Compton shift refers to:

Question # 8

The inside cavity of the black body is

Question # 9

Momentum is a parameter associated with

Question # 10

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

Question # 11

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 12

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 13

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

Question # 14

Position was discovered by Carl Anderson in

Question # 15

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
3 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
4 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
5 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
6 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
7 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
8 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these

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