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

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
2	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
3	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
4	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
5	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
6	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
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	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
9	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
10	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates

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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

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

From the theory of relativity, momentum p of the photon is related to energy as

In photoelectric effect the energy of ejected electrons depend on

There is no way to detect:

The Stephen-Boltzmann law for the black body radiation is given by

The special theory of relativity treats problems invoving

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

Converse of pair production is known as

Newton's law of motion do not hold in

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

Electromagnetic -radiation means:

The energy of the 4th orbit in hydrogen atom is

0.1 kg mass will be equivalent to the energy

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

The length contraction happens only

The unit of work function is:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

S.I. unit of planks constant is

When the atomic particle are moving with velocities approaching that of light:

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

A black body is

According to the special theory of relativity, a moving clock

When a position comes close to an electron they annihilate into

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Class 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