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	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
2	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
3	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
4	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
5	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
6	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
7	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
8	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
9	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
10	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927

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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 inertial frame is that frame in which

If a body reaches a speed equal to the speed of light, then its mass will became

The special theory of relatively treats the problems involving:

When a platinum wire is heated, it appears white at

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

Which of the following is not an example of intertial frame

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

Photoelectric effect takes place with a photon of:

the symbol to be used in relativity problems denotes:

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

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

The energy of a photon is represented by

Compton was awarded Nobel prize in physics in

The existence of position was predicted by Dirace in

Which one of the following physical quantities changes with relativistic speed

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

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

The concept of direction is purely:

de-Broglies hypthesis was experimentally verified by

Intensity of light determines the:

A black body is

Pair production is the phenomenon in which

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

The length contraction happens only

The inside cavity of the black body is

The mass of an object will be doubled at speed

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

According to the special theory of relativity, a moving clock

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

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ECAT Physics Chapter 19 Important MCQ's

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