ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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 the 4th orbit in hydrogen atom is

Question # 2

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

Question # 3

The special theory of relativity is based on:

Question # 4

In photoelectric effect the energy of ejected electrons depend on

Question # 5

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 6

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 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

Question # 8

Wien's constant is measured in:

Question # 9

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

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

Davision and Germer performed experiment to verify

Question # 12

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 13

the symbol to be used in relativity problems denotes:

Question # 14

When a platinum wire is heated, it appears dull red at about

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
2 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
5 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 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
8 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
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
10 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev

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