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	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
2	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
3	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
4	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
5	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
6	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
7	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
8	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
9	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v 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

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

The inside cavity of the black body is

The mass of an object will be doubled at speed

S.I. unit of planks constant is

Electromagnetic -radiation means:

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

The special theory of relativity is based on:

The concept of direction is purely:

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:

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

The special theory of relativity is based on the

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

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

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

At the temperature, a body emits radiation which is principally

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

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 value of threshold frequency for different metals is

In photoelectric effect the energy of ejected electrons depend on

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

A black body is

An inertial frame is that frame in which

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

Compton was awarded Nobel prize in physics in

The special theory of relativity treats problems invoving

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Practically the quantity v/c is always:

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ECAT Physics Chapter 19 Important MCQ's

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