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

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

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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 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
2	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)
3	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
4	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
5	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
6	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
7	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
8	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
9	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
10	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons

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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

The inside cavity of the black body is

The energy of a photon is represented by

The positron was discovered by:

The special theory of relativity is based on the

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

Pair production is the phenomenon in which

the symbol to be used in relativity problems denotes:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

When a platinum wire is heated, it appears white at

The Nobel Prize on the explanation of photoelectric effect was awarded to:

In the compton's effect, it is found that the wavelength of incident x-rays is

The value of threshold frequency for different metals is

The energy of photon 'E' is proported to

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

Wave nature of particle was proposed by

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

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

the dilation of time applies to the timing processes which are:

The concept of direction and position are purely

According to the special theory of relativity, a moving clock

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

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

According to the special theory of relativity, time is

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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

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