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

0.1 kg mass will be equivalent to the energy

Question # 2

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 3

The inside cavity of the black body is

Question # 4

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 5

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

Question # 6

In photoelectric effect the energy of ejected electrons depend on

Question # 7

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

Question # 8

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

Question # 9

Photocell is a device which converts

Question # 10

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

Question # 11

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

Question # 12

the dilation of time applies to the timing processes which are:

Question # 13

The mass of an object will be doubled at speed

Question # 14

Wien's constant is measured in:

Question # 15

Which one of the following physical quantities changes with relativistic speed

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

Position was discovered by Carl Anderson in

Question # 20

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 21

Due to relative motion of observer and the frame of reference of events, time always:

Question # 22

The idea of quantization of energy was proposed by:

Question # 23

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 24

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

Question # 25

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 26

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

Question # 27

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 28

When a platinum wire is heated, it appears white at

Question # 29

The unit of work function is:

Question # 30

A particle having mass and charge equal to that of an electron is called:

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Sr.# Question Answer
1 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
2 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
3 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
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 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
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 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
9 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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