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	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
2	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
3	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
4	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
5	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
6	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
7	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
8	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
10	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²

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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 energy of a photon is represented by

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

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

Compton was awarded Nobel prize in physics in

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

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

Position was discovered by Carl Anderson in

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

S.I. unit of planks constant is

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

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

Practically the quantity v/c is always:

the dilation of time applies to the timing processes which are:

With the help of 50 K v electron microscope, a resolution of

Electromagnetic radiation or photons interact with matter in

When a platinum wire is heated, it appears white at

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

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

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

The concept of direction and position are purely

The special theory of relativity is based on:

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Which of the following phenomenon proves the particle nature of light

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

Photoelectrons are emitted when ultraviolet light falls on:

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

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

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