ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
2	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
3	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
4	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
5	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
6	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
7	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
8	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
9	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
10	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal

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ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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

Strictly speaking, the earth is:

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

A black body is

Wave nature of particle was proposed by

In process of annihilation of matter, the two photons produced move in opposite direction to converse

The length contraction happens only

Photoelectric effect takes place with a photon of:

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

An intertial frame of reference is a frame of reference which is

When a platinum wire is heated, it appears yellow at

Photoelectrons are emitted when ultraviolet light falls on:

There is no way to detect:

Absolute motion cannot be detected

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

S.I. unit of planks constant is

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

The value of threshold frequency for different metals is

Wien's constant is measured in:

Which of the following is not an example of intertial frame

The value of the plank's constant 'h' is given by

Position was discovered by Carl Anderson in

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

Converse of pair production is known as

According to the special theory of relativity, time is

Intensity of light determines the:

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be