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

Question # 2

Victor de-Brogile received the Nobel prize in physics in

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The special theory of relativity treats problems invoving

Question # 8

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 9

At the temperature, a body emits radiation which is principally

Question # 10

When a platinum wire is heated, it appears dull red at about

Question # 11

The mass of an object will be doubled at speed

Question # 12

Which of the following is not an example of intertial frame

Question # 13

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

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
4 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
5 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
8 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
9 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
10 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference

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