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 intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 2

When platinum wire is heated, it appears cherry red at

Question # 3

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 4

A non-inertial frame of reference is one, in which

Question # 5

If a material object moves with the speed of light 'C' its mass becomes

Question # 6

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The special theory of relativity is based on:

Question # 11

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
2 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
3 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
4 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
9 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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