ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

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

Question # 3

Which of the following phenomenon proves the particle nature of light

Question # 4

Momentum is a parameter associated with

Question # 5

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 6

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 7

When a position comes close to an electron they annihilate into

Question # 8

the symbol to be used in relativity problems denotes:

Question # 9

Absolute motion cannot be detected

Question # 10

The special theory of relativity is based on:

Question # 11

The Stephen-Boltzmann law for the black body radiation is given by

Question # 12

The concept of direction and position are purely

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

Compton was awarded Nobel prize in physics in

Question # 21

When a platinum wire is heated, it appears orange red at

Question # 22

There is no way to detect:

Question # 23

The special theory of relativity treats problems invoving

Question # 24

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 25

Pair production is the phenomenon in which

Question # 26

de-Broglies hypthesis was experimentally verified by

Question # 27

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

Question # 28

The mass of an object will be doubled at speed

Question # 29

Photocell is a device which converts

Question # 30

Electromagnetic radiation or photons interact with matter in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
2 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
3 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
4 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
5 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
6 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD

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