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

00:00
Question # 1

An inertial frame is that frame in which

Question # 2

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

Question # 3

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

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

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

Question # 6

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

Question # 7

At the temperature, a body emits radiation which is principally

Question # 8

Wave nature of particle was proposed by

Question # 9

Which of the following is not an example of intertial frame

Question # 10

Which of the following phenomenon proves the particle nature of light

Question # 11

The existence of position was predicted by Dirace in

Question # 12

Photocell is a device which converts

Question # 13

The inside cavity of the black body is

Question # 14

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

Question # 15

Strictly speaking, the earth is:

Question # 16

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

Question # 17

The photon of radio-waves has energy of about

Question # 18

Absolute motion cannot be detected

Question # 19

S.I. unit of planks constant is

Question # 20

The energy of photon 'E' is proported to

Question # 21

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 22

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

Question # 23

The year when A.H. compton was awarded Nobel Prize is:

Question # 24

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 25

Davision and Germer performed experiment to verify

Question # 26

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

Question # 27

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

Question # 28

Photoelectric effect takes place with a photon of:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
2 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
3 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
4 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
5 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
8 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these

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