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

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

Question # 2

A black body is

Question # 3

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

Question # 4

Compton shift refers to:

Question # 5

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

Question # 6

Photocell is a device which converts

Question # 7

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 8

Momentum is a parameter associated with

Question # 9

The concept of direction is purely:

Question # 10

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 11

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

Question # 12

The value of the Stephen's constant for black body radiations is given by

Question # 13

The length contraction happens only

Question # 14

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

Question # 15

The general theory of relativity treats problems involving

Question # 16

The energy of the 4th orbit in hydrogen atom is

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

Which of the following phenomenon proves the particle nature of light

Question # 21

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 22

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

Question # 23

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 24

S.I. unit of planks constant is

Question # 25

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

Question # 26

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 27

The positron was discovered by:

Question # 28

Davision and Germer performed experiment to verify

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
7 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
8 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
9 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
10 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

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