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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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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 mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
2	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
3	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
4	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
5	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
6	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
7	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
8	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
9	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
10	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these

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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

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

A black body is

0.1 kg mass will be equivalent to the energy

Wien's constant is measured in:

When platinum wire is heated, it appears cherry red at

From the theory of relativity, momentum p of the photon is related to energy as

Photoelectric effect takes place with a photon of:

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

S.I. unit of planks constant is

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

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

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

The nature of radiations emitted by a hot body depends upon its:

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

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

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

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

There is no way to detect:

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

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

the symbol to be used in relativity problems denotes:

The general theory of relativity treats problems involving

The concept of direction is purely:

When a platinum wire is heated, it appears white at

Which one of the following physical quantities changes with relativistic speed

The energy of photon 'E' is proported to

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

According to the special theory of relativity, time is

According to the special theory of relativity, a moving clock

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

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ECAT Physics Chapter 19 Important MCQ's

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