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	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
2	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
4	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
5	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
6	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
7	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:	A. Smaller B. Lerger C. Same D. Much larger
8	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	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
10	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature

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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

S.I. unit of planks constant is

When platinum wire is heated, it appears cherry red at

When a position comes close to an electron they annihilate into

Photoelectrons are emitted when ultraviolet light falls on:

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

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

The inside cavity of the black body is

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

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

The general theory of relativity treats problems involving

According to the special theory of relativity, a moving clock

The mass of an object will be doubled at speed

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

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

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

When a platinum wire is heated, it appears orange red at

A black body is

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

Pair production is the phenomenon in which

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

Wave nature of particle was proposed by

When a platinum wire is heated, it appears white at

Wien's constant is measured in:

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

The value of threshold frequency for different metals is

An inertial frame is that frame in which

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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:

Victor de-Brogile received the Nobel prize in physics in

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