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

The energy of photon 'E' is proported to

Question # 2

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

Question # 3

The Stephen-Boltzmann law for the black body radiation is given by

Question # 4

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

Question # 5

According to the special theory of relativity, time is

Question # 6

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

Question # 7

A black body is

Question # 8

Davision and Germer performed experiment to verify

Question # 9

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

Question # 10

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 11

An inertial frame is that frame in which

Question # 12

Compton shift refers to:

Question # 13

Newton's law of motion do not hold in

Question # 14

As the light shines on the metal surface, the electrons are ejected

Question # 15

S.I. unit of planks constant is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
2 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
3 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
4 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
5 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
6 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
7 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
8 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
9 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
10 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above

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