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 means:	A. Photons B. protons C. Electrons D. Mesons
2	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
3	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
4	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
5	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
6	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
7	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
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	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
10	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js

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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

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

The general theory of relativity treats problems involving

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

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

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

When a position comes close to an electron they annihilate into

The existence of position was predicted by Dirace in

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

Davision and Germer performed experiment to verify

The special theory of relatively treats the problems involving:

A photon is considered to have

Due to relative motion of observer and the frame of reference of events, time always:

The energy of the 4th orbit in hydrogen atom is

The concept of direction and position are purely

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

The inside cavity of the black body is

When a platinum wire is heated, it appears orange red at

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Wien's constant is measured in:

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

Absolute motion cannot be detected

According to the special theory of relativity, a moving clock

Electromagnetic radiation or photons interact with matter in

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

The energy of a photon is represented by

The unit of work function is:

Compton was awarded Nobel prize in physics in

Which one of the following physical quantities changes with relativistic speed

When platinum wire is heated, it appears cherry red at

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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