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	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
3	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
4	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
5	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
6	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
7	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
8	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
9	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

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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 nature of radiations emitted by a hot body depends upon its:

An inertial frame is that frame in which

Electromagnetic -radiation means:

Victor de-Brogile received the Nobel prize in physics in

When a position comes close to an electron they annihilate into

The special theory of relativity is based on:

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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

The inside cavity of the black body is

Newton's law of motion do not hold in

Converse of pair production is known as

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

S.I. unit of planks constant is

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

Strictly speaking, the earth is:

Davision and Germer performed experiment to verify

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

A black body is

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

According to the special theory of relativity, a moving clock

The value of threshold frequency for different metals is

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

0.1 kg mass will be equivalent to the energy

Photoelectrons are emitted when ultraviolet light falls on:

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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

According to the special theory of relativity

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