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

Davision and Germer performed experiment to verify

Question # 2

The unit of work function is:

Question # 3

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

Question # 4

According to the special theory of relativity, time is

Question # 5

The photon of radio-waves has energy of about

Question # 6

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 7

The energy of photon 'E' is proported to

Question # 8

The Einstein's changes in length, mass and time are not observed in common life because

Question # 9

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 10

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

Question # 11

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

Question # 12

When a position comes close to an electron they annihilate into photons such that

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
3 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
4 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
5 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
6 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
7 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
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 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s

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