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 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
2	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
3	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
4	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
5	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
6	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
7	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
8	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
9	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
10	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

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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

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

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Intensity of light determines the:

The value of threshold frequency for different metals is

S.I. unit of planks constant is

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

In photoelectric effect the energy of ejected electrons depend on

When a platinum wire is heated, it appears yellow at

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

Converse of pair production is known as

When platinum wire is heated, it appears cherry red at

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

Wave nature of particle was proposed by

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

The energy of the 4th orbit in hydrogen atom is

According to the special theory of relativity

The value of the plank's constant 'h' is given by

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

the symbol to be used in relativity problems denotes:

Electromagnetic -radiation means:

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:

Which of the following is not an example of intertial frame

The special theory of relativity is based on the

The inside cavity of the black body is

According to the special theory of relativity, a moving clock

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

The concept of direction is purely:

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

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

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

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ECAT Physics Chapter 19 Important MCQ's

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