ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

Question # 2

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 3

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 4

When platinum wire is heated, it appears cherry red at

Question # 5

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

Question # 6

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

Question # 7

Photoelectrons are emitted when ultraviolet light falls on:

Question # 8

The positron was discovered by:

Question # 9

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 10

Electromagnetic radiation or photons interact with matter in

Question # 11

According to the special theory of relativity

Question # 12

With the help of 50 K v electron microscope, a resolution of

Question # 13

Absolute motion cannot be detected

Question # 14

The idea of quantization of energy was proposed by:

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 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
3 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
4 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
5 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
6 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
7 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
8 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
9 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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