ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

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	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
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	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
6	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
7	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
8	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
9	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
10	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK

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

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

The concept of direction and position are purely

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

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

The positron was discovered by:

Converse of pair production is known as

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

The general theory of relativity treats problems involving

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

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

At the temperature, a body emits radiation which is principally

If a body reaches a speed equal to the speed of light, then its mass will became

The special theory of relatively treats the problems involving:

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

A black body is

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

As the light shines on the metal surface, the electrons are ejected

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

The idea of quantization of energy was proposed by:

The photon of radio-waves has energy of about

0.1 kg mass will be equivalent to the energy

Compton shift refers to:

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

The special theory of relativity is based on:

de-Broglies hypthesis was experimentally verified by

The energy of the 4th orbit in hydrogen atom is

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

A particle having mass and charge equal to that of an electron is called:

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ECAT Physics Chapter 19 Important MCQ's

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