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 Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
2	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
3	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
4	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
5	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
6	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
7	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
8	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
9	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
10	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time

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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

Wave nature of particle was proposed by

The energy of the 4th orbit in hydrogen atom is

When a platinum wire is heated, it appears yellow at

The photon of radio-waves has energy of about

In photoelectric effect the energy of ejected electrons depend on

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

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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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

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

An inertial frame is that frame in which

Pair production is the phenomenon in which

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

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

According to the special theory of relativity

Strictly speaking, the earth is:

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

The special theory of relativity is based on:

There is no way to detect:

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

The general theory of relativity treats problems involving

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

Momentum is a parameter associated with

Wien's constant is measured in:

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

The inside cavity of the black body is

The concept of direction is purely:

The photoelectric effect, the maximum energy of photoelectrons depends on the

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:

Practically the quantity v/c is always:

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ECAT Physics Chapter 19 Important MCQ's

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