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	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
2	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
3	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
4	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
5	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
6	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)
7	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
8	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
9	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
10	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these

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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

According to the special theory of relativity, time is

The Einstein's changes in length, mass and time are not observed in common life because

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

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

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

Position was discovered by Carl Anderson in

The length contraction happens only

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

If a body reaches a speed equal to the speed of light, then its mass will became

the dilation of time applies to the timing processes which are:

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

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

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

A photon is considered to have

Photoelectric effect takes place with a photon of:

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

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

Davision and Germer performed experiment to verify

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

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

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

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

The special theory of relativity treats problems invoving

The positron was discovered by:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

0.1 kg mass will be equivalent to the energy

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

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

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ECAT Class Physics Chapter 19 Important MCQ's

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