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

0.1 kg mass will be equivalent to the energy

Question # 2

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

Question # 3

A black body is

Question # 4

According to the special theory of relativity, a moving clock

Question # 5

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 6

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

Absolute motion cannot be detected

Question # 9

Momentum is a parameter associated with

Question # 10

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

Question # 11

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

Question # 12

The positron was discovered by:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
2 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
3 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
7 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
8 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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

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