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 analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 2

Newton's law of motion do not hold in

Question # 3

With the help of 50 K v electron microscope, a resolution of

Question # 4

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

Question # 5

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 6

The length contraction happens only

Question # 7

Photocell is a device which converts

Question # 8

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

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

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 # 11

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 12

The existence of position was predicted by Dirace in

Question # 13

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 14

Momentum is a parameter associated with

Question # 15

The value of the plank's constant 'h' is given by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
2 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
3 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)
4 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
5 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
6 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
7 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
9 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
10 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

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