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	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
2	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
3	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
4	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
5	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
6	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
7	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
8	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
9	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
10	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite

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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

Wien's constant is measured in:

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

When a platinum wire is heated, it appears white at

In photoelectric effect the energy of ejected electrons depend on

Converse of pair production is known as

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

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

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 the

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

When platinum wire is heated, it appears cherry red at

Electromagnetic -radiation means:

Absolute motion cannot be detected

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

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

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

de-Broglies hypthesis was experimentally verified by

When a position comes close to an electron they annihilate into

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:

Compton was awarded Nobel prize in physics in

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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

Wave nature of particle was proposed by

Photoelectrons are emitted when ultraviolet light falls on:

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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Pair production is the phenomenon in which

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

Photoelectric effect takes place with a photon of:

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

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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