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

The concept of direction and position are purely

Question # 2

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

Question # 3

If a material object moves with the speed of light 'C' its mass becomes

Question # 4

Compton shift refers to:

Question # 5

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

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

Absolute motion cannot be detected

Question # 8

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

Question # 9

Intensity of light determines the:

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

The Einstein's changes in length, mass and time are not observed in common life because

Question # 12

When the atomic particle are moving with velocities approaching that of light:

Question # 13

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 14

When a platinum wire is heated, it appears yellow at

Question # 15

Photoelectric effect takes place with a photon of:

Question # 16

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

Question # 17

Pair production is the phenomenon in which

Question # 18

The value of threshold frequency for different metals is

Question # 19

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

Question # 20

The mass of an object will be doubled at speed

Question # 21

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

Question # 22

According to the special theory of relativity, time is

Question # 23

In photoelectric effect the energy of ejected electrons depend on

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 28

Davision and Germer performed experiment to verify

Question # 29

The unit of work function is:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
2 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
3 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
4 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
5 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
6 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
7 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
9 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
10 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

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