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

Converse of pair production is known as

Question # 2

When platinum wire is heated, it appears cherry red at

Question # 3

Davision and Germer performed experiment to verify

Question # 4

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

Question # 5

There is no way to detect:

Question # 6

The energy of the 4th orbit in hydrogen atom is

Question # 7

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 8

Electromagnetic -radiation means:

Question # 9

the dilation of time applies to the timing processes which are:

Question # 10

An inertial frame is that frame in which

Question # 11

0.1 kg mass will be equivalent to the energy

Question # 12

The photon of radio-waves has energy of about

Question # 13

The value of threshold frequency for different metals is

Question # 14

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

Question # 15

A photon is considered to have

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
2 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
3 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
4 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
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
9 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
10 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red

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