ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

The nature of radiations emitted by a hot body depends upon its:

Question # 3

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 4

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 5

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

Question # 6

The positron was discovered by:

Question # 7

When a platinum wire is heated, it appears yellow at

Question # 8

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 9

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

Question # 10

When platinum wire is heated, it appears cherry red at

Question # 11

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 # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

Position was discovered by Carl Anderson in

Question # 14

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 15

0.1 kg mass will be equivalent to the energy

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
2 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
3 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
4 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
5 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
6 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
7 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
9 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
10 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

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    hasnain

    30 May 2018

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