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 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
2	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
3	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	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
5	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
6	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
7	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
8	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
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	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

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

Photoelectrons are emitted when ultraviolet light falls on:

The general theory of relativity treats problems involving

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

A black body is

0.1 kg mass will be equivalent to the energy

The energy of photon 'E' is proported to

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Wien's constant is measured in:

The positron was discovered by:

Newton's law of motion do not hold in

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Pair production is the phenomenon in which

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

Which of the following phenomenon proves the particle nature of light

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

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

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

When a position comes close to an electron they annihilate into

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

At the temperature, a body emits radiation which is principally

Momentum is a parameter associated with

The energy of a photon is represented by

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

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

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

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

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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