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	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
2	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
3	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
4	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
5	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
6	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
7	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	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:	A. Smaller B. Lerger C. Same D. Much larger
10	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

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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

G.P. Thomson observer experimentally that electrons and neutrons possess

Strictly speaking, the earth is:

The length contraction happens only

When platinum wire is heated, it appears cherry red at

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

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

Pair production is the phenomenon in which

de-Broglies hypthesis was experimentally verified by

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

Converse of pair production is known as

Practically the quantity v/c is always:

Momentum is a parameter associated with

The concept of direction is purely:

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

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

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

The value of the Stephen's constant for black body radiations is given by

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

When a platinum wire is heated, it appears yellow at

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

A black body is

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

S.I. unit of planks constant is

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

The unit of work function is:

Victor de-Brogile received the Nobel prize in physics in

There is no way to detect:

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

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

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

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ECAT Physics Chapter 19 Important MCQ's

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