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	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
2	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
3	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
4	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
5	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one 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	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
8	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
9	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
10	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above

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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

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

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

0.1 kg mass will be equivalent to the energy

Strictly speaking, the earth is:

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

When a platinum wire is heated, it appears white at

The energy of photon 'E' is proported to

Pair production is the phenomenon in which

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

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

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

The Einstein's changes in length, mass and time are not observed in common life because

At the temperature, a body emits radiation which is principally

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

The existence of position was predicted by Dirace in

Practically the quantity v/c is always:

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

The photon of radio-waves has energy of about

According to the special theory of relativity, time is

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

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

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

The unit of work function is:

The general theory of relativity treats problems involving

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

The concept of direction is purely:

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

Photoelectrons are emitted when ultraviolet light falls on:

Davision and Germer performed experiment to verify

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

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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