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	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	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. Smaller B. Lerger C. Same D. Much larger
3	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
5	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
8	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
9	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
10	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite

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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

Wave nature of particle was proposed by

An inertial frame is that frame in which

Wien's constant is measured in:

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Victor de-Brogile received the Nobel prize in physics in

The special theory of relativity is based on the

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

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

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

Practically the quantity v/c is always:

Davision and Germer performed experiment to verify

Pair production is the phenomenon in which

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

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

Photoelectrons are emitted when ultraviolet light falls on:

According to the special theory of relativity

Which of the following phenomenon proves the particle nature of light

The concept of direction and position are purely

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

The positron was discovered by:

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

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

A photon is considered to have

When a platinum wire is heated, it appears white at

The energy of a photon is represented by

In the compton's effect, it is found that the wavelength of incident x-rays is

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

The mass of an object will be doubled at speed

The inside cavity of the black body is

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