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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The unit of work function is:

Question # 8

From the theory of relativity, momentum p of the photon is related to energy as

Question # 9

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

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

The mass of an object will be doubled at speed

Question # 12

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

Question # 13

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 14

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
2 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
3 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 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)
6 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
7 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
8 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
9 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
10 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction

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