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 dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
2	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
3	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
4	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
5	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
6	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
7	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
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	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
10	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these

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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 dilation of time applies to the timing processes which are:

Converse of pair production is known as

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

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

According to the special theory of relativity, a moving clock

S.I. unit of planks constant is

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

The special theory of relativity is based on:

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

The positron was discovered by:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Wien's constant is measured in:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

An intertial frame of reference is a frame of reference which is

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

A particle having mass and charge equal to that of an electron is called:

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

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

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

The idea of quantization of energy was proposed by:

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

de-Broglies hypthesis was experimentally verified by

Wave nature of particle was proposed by

Intensity of light determines the:

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

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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Strictly speaking, the earth is:

A black body is

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