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

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

Question # 2

The energy of a photon is represented by

Question # 3

The inside cavity of the black body is

Question # 4

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

Question # 5

In photoelectric effect the energy of ejected electrons depend on

Question # 6

The value of the Stephen's constant for black body radiations is given by

Question # 7

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

Question # 8

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 9

Intensity of light determines the:

Question # 10

The positron was discovered by:

Question # 11

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

Question # 12

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

Question # 13

Victor de-Brogile received the Nobel prize in physics in

Question # 14

When a platinum wire is heated, it appears orange red at

Question # 15

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
2 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
3 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
4 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
5 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
6 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
7 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
8 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
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 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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