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 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
2	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
3	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
4	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
5	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
7	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
8	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
9	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
10	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

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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 special theory of relativity treats problems invoving

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

The mass of an object will be doubled at speed

The general theory of relativity treats problems involving

Photoelectrons are emitted when ultraviolet light falls on:

The inside cavity of the black body is

An inertial frame is that frame in which

Absolute motion cannot be detected

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

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

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

In photoelectric effect the energy of ejected electrons depend on

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

Converse of pair production is known as

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

Victor de-Brogile received the Nobel prize in physics in

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

Which of the following phenomenon proves the particle nature of light

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

The special theory of relativity is based on:

Wien's constant is measured in:

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

The concept of direction is purely:

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

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

Pair production is the phenomenon in which

The year when A.H. compton was awarded Nobel Prize is:

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

The special theory of relatively treats the problems involving:

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

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ECAT Physics Chapter 19 Important MCQ's

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