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 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
2	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
3	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
4	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
5	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
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	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
8	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
9	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
10	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

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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

Electromagnetic -radiation means:

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

The energy of the 4th orbit in hydrogen atom is

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

Electromagnetic radiation or photons interact with matter in

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

Which of the following is not an example of intertial frame

Position was discovered by Carl Anderson in

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

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

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

When a platinum wire is heated, it appears white at

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

The idea of quantization of energy was proposed by:

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

The energy of a photon is represented by

The length contraction happens only

In photoelectric effect the energy of ejected electrons depend on

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

The unit of work function is:

There is no way to detect:

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

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

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

Momentum is a parameter associated with

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

The special theory of relatively treats the problems involving:

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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: