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	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
2	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
3	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
4	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
5	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
8	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
9	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
10	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation

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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

Absolute motion cannot be detected

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Position was discovered by Carl Anderson in

Electromagnetic -radiation means:

The special theory of relativity is based on the

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

The inside cavity of the black body is

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

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

In photoelectric effect the energy of ejected electrons depend on

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

Wave nature of particle was proposed by

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

Which one of the following physical quantities changes with relativistic speed

Converse of pair production is known as

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

The unit of work function is:

At the temperature, a body emits radiation which is principally

Intensity of light determines the:

A non-inertial frame of reference is one, in which

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

According to the special theory of relativity, time is

Photocell is a device which converts

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

When a platinum wire is heated, it appears yellow at

The length contraction happens only

According to the Max plank, energy is redialed or absorbed in

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: