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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
3	When a platinum wire is heated, it appears white 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	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
6	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
9	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
10	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²

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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

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

Which one of the following physical quantities changes with relativistic speed

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

When a position comes close to an electron they annihilate into

Which of the following phenomenon proves the particle nature of light

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

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

Photocell is a device which converts

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

the symbol to be used in relativity problems denotes:

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

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

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

An inertial frame is that frame in which

The value of the plank's constant 'h' is given by

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

Converse of pair production is known as

Due to relative motion of observer and the frame of reference of events, time always:

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

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

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

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:

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

The unit of work function is:

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Victor de-Brogile received the Nobel prize in physics in

According to the special theory of relativity, a moving clock

At the temperature, a body emits radiation which is principally

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

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