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

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

Question # 2

Position was discovered by Carl Anderson in

Question # 3

According to the special theory of relativity

Question # 4

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

Question # 5

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

Question # 6

The inside cavity of the black body is

Question # 7

Intensity of light determines the:

Question # 8

Photocell is a device which converts

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 11

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

Question # 12

There is no way to detect:

Question # 13

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

Question # 14

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

Question # 15

The unit of work function is:

Question # 16

Davision and Germer performed experiment to verify

Question # 17

From the theory of relativity, momentum p of the photon is related to energy as

Question # 18

The energy of the 4th orbit in hydrogen atom is

Question # 19

Which one of the following physical quantities changes with relativistic speed

Question # 20

According to the special theory of relativity, time is

Question # 21

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 22

When a position comes close to an electron they annihilate into

Question # 23

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

Question # 24

Electromagnetic -radiation means:

Question # 25

the symbol to be used in relativity problems denotes:

Question # 26

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

Question # 27

At the temperature, a body emits radiation which is principally

Question # 28

The photon of radio-waves has energy of about

Question # 29

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 30

Photoelectrons are emitted when ultraviolet light falls on:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
2 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
3 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
4 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
5 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
6 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
7 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
10 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923

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