ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering 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

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

Question # 3

When a platinum wire is heated, it appears orange red at

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 6

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

Question # 7

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

Question # 8

Which one of the following physical quantities changes with relativistic speed

Question # 9

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 10

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 11

The special theory of relativity is based on:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
2 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
3 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
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 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
8 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
9 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
10 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these

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    hasnain

    30 May 2018

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