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

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 2

When a platinum wire is heated, it appears white at

Question # 3

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

Question # 4

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

Question # 5

When a position comes close to an electron they annihilate into

Question # 6

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 7

In order to produce pair production, a photon must have a energy

Question # 8

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

Question # 9

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

Question # 10

The special theory of relatively treats the problems involving:

Question # 11

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

Question # 12

Photoelectric effect takes place with a photon of:

Question # 13

Electromagnetic radiation or photons interact with matter in

Question # 14

The mass of an object will be doubled at speed

Question # 15

Converse of pair production is known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
2 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
3 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
4 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
5 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
6 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
7 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
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 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well

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