ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

The special theory of relativity is based on the

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

The energy of a photon is represented by

Question # 4

S.I. unit of planks constant is

Question # 5

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

Question # 6

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

When a platinum wire is heated, it appears yellow at

Question # 12

The idea of quantization of energy was proposed by:

Question # 13

When a position comes close to an electron they annihilate into photons such that

Question # 14

Converse of pair production is known as

Question # 15

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
2 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
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 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
5 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
6 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
10 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these

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