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	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
2	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
3	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
4	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
5	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
6	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
7	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High 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	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
10	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None 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

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

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

Wave nature of particle was proposed by

With the help of 50 K v electron microscope, a resolution of

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

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

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

The concept of direction and position are purely

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

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

Photoelectric effect takes place with a photon of:

Intensity of light determines the:

Electromagnetic radiation or photons interact with matter in

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

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

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

In photoelectric effect the energy of ejected electrons depend on

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

The length contraction happens only

The concept of direction is purely:

The unit of work function is:

Victor de-Brogile received the Nobel prize in physics in

When the atomic particle are moving with velocities approaching that of light:

The Einstein's changes in length, mass and time are not observed in common life because

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

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Momentum is a parameter associated with

Which of the following phenomenon proves the particle nature of light

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