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

Try The 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

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 2

Position was discovered by Carl Anderson in

Question # 3

Newton's law of motion do not hold in

Question # 4

The inside cavity of the black body is

Question # 5

Photocell is a device which converts

Question # 6

A particle having mass and charge equal to that of an electron is called:

Question # 7

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 8

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 9

The positron was discovered by:

Question # 10

Pair production is the phenomenon in which

Question # 11

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

Question # 12

A black body is

Question # 13

The value of the Stephen's constant for black body radiations is given by

Question # 14

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 15

Wien's constant is measured in:

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

Momentum is a parameter associated with

Question # 20

The concept of direction is purely:

Question # 21

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 22

According to the special theory of relativity

Question # 23

A non-inertial frame of reference is one, in which

Question # 24

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

Question # 25

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 26

The length contraction happens only

Question # 27

The existence of position was predicted by Dirace in

Question # 28

S.I. unit of planks constant is

Question # 29

The energy of the 4th orbit in hydrogen atom is

Question # 30

Davision and Germer performed experiment to verify

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 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
3 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
5 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
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 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
10 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer

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