ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
2	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
3	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
4	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
5	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
6	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
7	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
8	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
9	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
10	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C

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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

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

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

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

According to the special theory of relativity

Newton's law of motion do not hold in

There is no way to detect:

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

A photon is considered to have

The year when A.H. compton was awarded Nobel Prize is:

The existence of position was predicted by Dirace in

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

A black body is

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

As the light shines on the metal surface, the electrons are ejected

An inertial frame is that frame in which

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

Intensity of light determines the:

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

The energy of photon 'E' is proported to

In the compton's effect, it is found that the wavelength of incident x-rays is

Practically the quantity v/c is always:

Photocell is a device which converts

The special theory of relativity is based on:

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

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

the symbol to be used in relativity problems denotes:

0.1 kg mass will be equivalent to the energy

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

The length contraction happens only

The special theory of relativity is based on the

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