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 emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
2	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
3	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
4	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
5	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
6	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
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	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
9	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
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

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Pair production is the phenomenon in which

The concept of direction is purely:

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

In order to produce pair production, a photon must have a energy

The concept of direction and position are purely

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

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

The special theory of relativity is based on the

In the compton's effect, it is found that the wavelength of incident x-rays is

The inside cavity of the black body is

S.I. unit of planks constant is

According to the special theory of relativity, time is

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

The year when A.H. compton was awarded Nobel Prize is:

When a position comes close to an electron they annihilate into photons such that

When a position comes close to an electron they annihilate into

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

A particle having mass and charge equal to that of an electron is called:

The general theory of relativity treats problems involving

Electromagnetic -radiation means:

Absolute motion cannot be detected

At the temperature, a body emits radiation which is principally

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

Position was discovered by Carl Anderson in

The idea of quantization of energy was proposed by:

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

The special theory of relatively treats the problems involving:

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

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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