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

Intensity of light determines the:

Question # 2

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 3

Which of the following is not an example of intertial frame

Question # 4

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

Question # 5

A photon is considered to have

Question # 6

Momentum is a parameter associated with

Question # 7

Which one of the following physical quantities changes with relativistic speed

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

The idea of quantization of energy was proposed by:

Question # 13

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

Question # 14

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

Question # 15

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 16

When a platinum wire is heated, it appears white at

Question # 17

Photocell is a device which converts

Question # 18

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

Question # 19

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

Question # 20

Photoelectrons are emitted when ultraviolet light falls on:

Question # 21

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

Question # 22

A black body is

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

The special theory of relativity is based on:

Question # 27

Wave nature of particle was proposed by

Question # 28

the symbol to be used in relativity problems denotes:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
2 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
3 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
4 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
5 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
6 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
7 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
8 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
9 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
10 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)

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