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	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
2	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
3	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
4	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
5	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
6	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
7	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
8	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
9	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
10	When a platinum wire is heated, it appears white 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

If a material object moves with the speed of light 'C' its mass becomes

Compton shift refers to:

Wave nature of particle was proposed by

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

According to the special theory of relativity, time is

The energy of photon 'E' is proported to

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

de-Broglies hypthesis was experimentally verified by

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

The special theory of relatively treats the problems involving:

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

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

0.1 kg mass will be equivalent to the energy

G.P. Thomson observer experimentally that electrons and neutrons possess

Wien's constant is measured in:

Newton's law of motion do not hold in

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

Pair production is the phenomenon in which

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

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

The existence of position was predicted by Dirace in

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

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

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

A particle having mass and charge equal to that of an electron is called:

When a position comes close to an electron they annihilate into

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

At the temperature, a body emits radiation which is principally

The special theory of relativity is based on the

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