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 energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
2	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
3	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
4	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
5	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
6	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
7	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
8	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
9	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
10	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties 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 de-Brogile relation, an object of large mass and ordinary speed has

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

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

When a platinum wire is heated, it appears white at

There is no way to detect:

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

Which of the following phenomenon proves the particle nature of light

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

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Converse of pair production is known as

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

S.I. unit of planks constant is

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

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

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

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

Compton was awarded Nobel prize in physics in

The inside cavity of the black body is

The unit of work function is:

When a platinum wire is heated, it appears yellow at

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

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

According to the special theory of relativity

Position was discovered by Carl Anderson in

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Victor de-Brogile received the Nobel prize in physics in

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

The energy of the 4th orbit in hydrogen atom is

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: