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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Aarij 08 - Dec - 2024 02 Min 25 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	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
2	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
3	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
4	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
5	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
6	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
7	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
8	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
9	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
10	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

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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

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

The special theory of relativity is based on:

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

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

Electromagnetic -radiation means:

Momentum is a parameter associated with

The energy of the 4th orbit in hydrogen atom is

Practically the quantity v/c is always:

The existence of position was predicted by Dirace in

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

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

0.1 kg mass will be equivalent to the energy

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

In order to produce pair production, a photon must have a energy

Strictly speaking, the earth is:

According to the special theory of relativity

A photon is considered to have

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

The value of threshold frequency for different metals is

The photon of radio-waves has energy of about

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

Newton's law of motion do not hold in

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

The mass of an object will be doubled at speed

S.I. unit of planks constant is

Intensity of light determines the:

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