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	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
2	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
3	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
4	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
5	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
6	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
7	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
8	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
9	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
10	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m

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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 ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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

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

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

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

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

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

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

A black body is

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

The concept of direction and position are purely

From the theory of relativity, momentum p of the photon is related to energy as

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

Electromagnetic radiation or photons interact with matter in

A photon is considered to have

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

Wave nature of particle was proposed by

According to the special theory of relativity

The energy of photon 'E' is proported to

When a platinum wire is heated, it appears orange red at

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

The energy of the 4th orbit in hydrogen atom is

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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:

The concept of direction is purely:

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

The Einstein's changes in length, mass and time are not observed in common life because

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

The positron was discovered by:

Photoelectric effect takes place with a photon of:

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

ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be