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 photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
2	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
3	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
4	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
5	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
6	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
7	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
8	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
9	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
10	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm

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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

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

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

The value of the Stephen's constant for black body radiations is given by

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

Electromagnetic -radiation means:

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

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Which of the following phenomenon proves the particle nature of light

Compton studied the scattering of x-rays by loosely bound electrons from:

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

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Which one of the following physical quantities changes with relativistic speed

According to the special theory of relativity

The photon of radio-waves has energy of about

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

When a position comes close to an electron they annihilate into

The existence of position was predicted by Dirace in

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

The positron was discovered by:

Converse of pair production is known as

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

the symbol to be used in relativity problems denotes:

At the temperature, a body emits radiation which is principally

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

Electromagnetic radiation or photons interact with matter in

The special theory of relativity treats problems invoving

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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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: