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

When a platinum wire is heated, it appears white at

Question # 2

The energy of a photon is represented by

Question # 3

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

Question # 4

The energy of the 4th orbit in hydrogen atom is

Question # 5

Practically the quantity v/c is always:

Question # 6

Wien's constant is measured in:

Question # 7

The nature of radiations emitted by a hot body depends upon its:

Question # 8

A photon is considered to have

Question # 9

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

Question # 10

When a platinum wire is heated, it appears yellow at

Question # 11

The general theory of relativity treats problems involving

Question # 12

Absolute motion cannot be detected

Question # 13

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

Question # 14

Compton shift refers to:

Question # 15

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 16

The concept of direction and position are purely

Question # 17

The energy of photon 'E' is proported to

Question # 18

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

Question # 19

The special theory of relativity treats problems invoving

Question # 20

The unit of work function is:

Question # 21

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

Question # 22

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

Question # 23

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 # 24

According to the Max plank, energy is redialed or absorbed in

Question # 25

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

Question # 26

At the temperature, a body emits radiation which is principally

Question # 27

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 28

Davision and Germer performed experiment to verify

Question # 29

Electromagnetic radiation or photons interact with matter in

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
2 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
3 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
4 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)
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
7 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
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 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
10 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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