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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

Absolute motion cannot be detected

Question # 3

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 4

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

Question # 5

Pair production is the phenomenon in which

Question # 6

The special theory of relativity treats problems invoving

Question # 7

S.I. unit of planks constant is

Question # 8

the symbol to be used in relativity problems denotes:

Question # 9

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

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

The energy of the 4th orbit in hydrogen atom is

Question # 12

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 13

The special theory of relatively treats the problems involving:

Question # 14

A photon is considered to have

Question # 15

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

Question # 16

Davision and Germer performed experiment to verify

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

Compton was awarded Nobel prize in physics in

Question # 21

Electromagnetic -radiation means:

Question # 22

The concept of direction and position are purely

Question # 23

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

Question # 24

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 25

The value of the plank's constant 'h' is given by

Question # 26

With the help of 50 K v electron microscope, a resolution of

Question # 27

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

Question # 28

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

Question # 29

The existence of position was predicted by Dirace in

Question # 30

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
3 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
5 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
6 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
7 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
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
10 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV

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