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

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

Question # 2

The length contraction happens only

Question # 3

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

Question # 4

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

Question # 5

In photoelectric effect the energy of ejected electrons depend on

Question # 6

The special theory of relativity treats problems invoving

Question # 7

The energy of the 4th orbit in hydrogen atom is

Question # 8

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

Question # 9

Position was discovered by Carl Anderson in

Question # 10

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

Question # 11

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 12

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

Question # 13

An intertial frame of reference is a frame of reference which is

Question # 14

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

Question # 15

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
2 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
3 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
4 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
5 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
6 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
7 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
8 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
9 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
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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