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	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
2	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
3	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
4	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
5	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
6	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
7	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
8	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
9	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
10	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v

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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

The existence of position was predicted by Dirace in

the symbol to be used in relativity problems denotes:

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

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

S.I. unit of planks constant is

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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

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

Absolute motion cannot be detected

Intensity of light determines the:

When a position comes close to an electron they annihilate into

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Converse of pair production is known as

The energy of the 4th orbit in hydrogen atom is

The mass of an object will be doubled at speed

Photocell is a device which converts

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

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

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

Strictly speaking, the earth is:

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Which of the following is not an example of intertial frame

A black body is

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

The length contraction happens only

A photon is considered to have

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

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

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be