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 special theory of relativity is based on:

Question # 3

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

Question # 4

The mass of an object will be doubled at speed

Question # 5

Which of the following is not an example of intertial frame

Question # 6

Photoelectric effect takes place with a photon of:

Question # 7

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

Question # 8

A non-inertial frame of reference is one, in which

Question # 9

The nature of radiations emitted by a hot body depends upon its:

Question # 10

The inside cavity of the black body is

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

Electromagnetic -radiation means:

Question # 13

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

Question # 14

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

Question # 15

When a position comes close to an electron they annihilate into

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

A photon is considered to have

Question # 20

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

Question # 21

The value of threshold frequency for different metals is

Question # 22

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

Question # 23

Converse of pair production is known as

Question # 24

Which of the following phenomenon proves the particle nature of light

Question # 25

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 26

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

Question # 27

The special theory of relativity treats problems invoving

Question # 28

Which one of the following physical quantities changes with relativistic speed

Question # 29

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
2 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
3 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)
4 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
5 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
6 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
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
9 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above

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