ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The special theory of relativity treats problems invoving

Question # 2

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 3

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

Question # 4

Converse of pair production is known as

Question # 5

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

Question # 6

When a platinum wire is heated, it appears white at

Question # 7

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

Question # 8

0.1 kg mass will be equivalent to the energy

Question # 9

An inertial frame is that frame in which

Question # 10

Wien's constant is measured in:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
2 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
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 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
5 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
6 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
7 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
8 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
9 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
10 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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