ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none 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	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
5	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
6	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
7	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
8	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
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	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White

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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

Max Planck received the Nobel Prize for his discovery of energy quants in:

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

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

Position was discovered by Carl Anderson in

The inside cavity of the black body is

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

The energy of photon 'E' is proported to

Newton's law of motion do not hold in

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

Pair production is the phenomenon in which

When platinum wire is heated, it appears cherry red at

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

A photon is considered to have

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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

When a platinum wire is heated, it appears dull red at about

Wien's constant is measured in:

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

According to the special theory of relativity, a moving clock

The general theory of relativity treats problems involving

Photoelectrons are emitted when ultraviolet light falls on:

Davision and Germer performed experiment to verify

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

When a platinum wire is heated, it appears yellow at

de-Broglies hypthesis was experimentally verified by

Intensity of light determines the:

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

From the theory of relativity, momentum p of the photon is related to energy as

When a platinum wire is heated, it appears white at

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ECAT Physics Chapter 19 Important MCQ's

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