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	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
2	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
3	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)
4	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
5	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
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
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	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
9	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
10	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White

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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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

The length contraction happens only

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

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

A photon is considered to have

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

The energy of a photon is represented by

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

When a position comes close to an electron they annihilate into

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

When a platinum wire is heated, it appears dull red at about

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

The special theory of relativity treats problems invoving

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

The existence of position was predicted by Dirace in

The energy of photon 'E' is proported to

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

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

Which one of the following physical quantities changes with relativistic speed

Compton shift refers to:

The general theory of relativity treats problems involving

The special theory of relativity is based on:

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

The unit of work function is:

The nature of radiations emitted by a hot body depends upon its:

The concept of direction and position are purely

The year when A.H. compton was awarded Nobel Prize is:

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

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

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be