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

Practically the quantity v/c is always:

Question # 2

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

When platinum wire is heated, it appears cherry red at

Question # 5

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

Question # 6

According to the special theory of relativity, a moving clock

Question # 7

Which of the following is not an example of intertial frame

Question # 8

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

Question # 9

Electromagnetic radiation or photons interact with matter in

Question # 10

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

Question # 11

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

Question # 12

The special theory of relativity is based on:

Question # 13

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

Question # 14

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

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

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Sr. # Question Answer
1 A black body is

A. an ideal absorber

B. an ideal radiator

C.both of them

D. none of them

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

A. at rest

B. moving with uniform velocity

C.either at rest or moving with uniform velocity

D. none of these

3 the symbol to be used in relativity problems denotes:

A. Dilated time

B. Proper time

C.Life time

D. Half time

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

A. larger

B. shorter

C.equal

D. none of these

5 Electromagnetic -radiation means:

A. Photons

B. protons

C.Electrons

D. Mesons

6 Photoelectrons are emitted when ultraviolet light falls on:

A. Casium

B. Silver

C.Potassium

D. Any of these

7 The special theory of relativity treats problems invoving

A. inertial frame of references

B. accelerating frame of references

C.both of these

D. none of these

8 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

9 An inertial frame is that frame in which

A. a>0

B. a=0

C.a<0

D. none of these

10 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

11 When a platinum wire is heated, it appears yellow at

A. 1600°C

B. 900°C

C.1100°C

D. 1300°C

12 The concept of direction and position are purely

A. absolute

B. relative

C.absolute or relative

D. none of these

13 de-Broglies hypthesis was experimentally verified by

A. Maxwell

B. Compton

C.Einstein

D. Davison and Germer

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

A. Max. Planck

B. Maxwell

C.Bohr

D. Rutherford

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

A. 500°C

B. 900°C

C.1100°C

D. 1300°C

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