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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shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
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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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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
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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	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
2	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
3	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
4	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
5	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
6	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
7	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
8	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
9	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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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

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

When a platinum wire is heated, it appears yellow at

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:

According to the special theory of relativity, a moving clock

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

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

Electromagnetic -radiation means:

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

There is no way to detect:

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

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

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

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

The unit of work function is:

the symbol to be used in relativity problems denotes:

The special theory of relativity is based on the

The special theory of relativity is based on:

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

A non-inertial frame of reference is one, in which

According to the Max plank, energy is redialed or absorbed in

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

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

With the help of 50 K v electron microscope, a resolution of

Practically the quantity v/c is always:

According to the special theory of relativity

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

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

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

ECAT Physics Chapter 19 Important MCQ's

Test Questions

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