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

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

Question # 2

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

Question # 3

Absolute motion cannot be detected

Question # 4

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

Question # 5

Newton's law of motion do not hold in

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

At the temperature, a body emits radiation which is principally

Question # 9

Davision and Germer performed experiment to verify

Question # 10

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 11

The concept of direction and position are purely

Question # 12

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 13

de-Broglies hypthesis was experimentally verified by

Question # 14

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

Question # 15

When a position comes close to an electron they annihilate into photons such that

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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 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
3 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
4 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
5 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
6 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
7 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
9 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
10 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)

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