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	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
2	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
3	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
5	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	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
8	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
9	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
10	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

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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

Due to relative motion of observer and the frame of reference of events, time always:

The Stephen-Boltzmann law for the black body radiation is given by

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Photocell is a device which converts

The inside cavity of the black body is

Electromagnetic -radiation means:

According to the special theory of relativity, a moving clock

When a position comes close to an electron they annihilate into

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

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

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

The energy of a photon is represented by

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Which of the following is not an example of intertial frame

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

Momentum is a parameter associated with

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

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

The mass of an object will be doubled at speed

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

The existence of position was predicted by Dirace in

The general theory of relativity treats problems involving

S.I. unit of planks constant is

The value of threshold frequency for different metals is

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

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

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

de-Broglies hypthesis was experimentally verified by

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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: