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	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
2	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
3	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
4	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
5	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
6	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. larger B. shorter C. equal D. none of these
7	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)
8	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev

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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

Photocell is a device which converts

According to the special theory of relativity

In photoelectric effect the energy of ejected electrons depend on

The idea of quantization of energy was proposed by:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Compton shift refers to:

If a material object moves with the speed of light 'C' its mass becomes

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

The energy of photon 'E' is proported to

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:

Electromagnetic -radiation means:

When a position comes close to an electron they annihilate into

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

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

Momentum is a parameter associated with

Photoelectrons are emitted when ultraviolet light falls on:

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

de-Broglies hypthesis was experimentally verified by

Position was discovered by Carl Anderson in

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

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

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

S.I. unit of planks constant is

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

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

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

The length contraction happens only

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

Davision and Germer performed experiment to verify

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

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