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	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
2	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
3	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
4	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
5	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
6	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
7	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
8	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
9	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
10	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways

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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 location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The energy of photon 'E' is proported to

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

The positron was discovered by:

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

According to the special theory of relativity, a moving clock

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

The energy of the 4th orbit in hydrogen atom is

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

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

The special theory of relativity treats problems invoving

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

An intertial frame of reference is a frame of reference which is

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

Victor de-Brogile received the Nobel prize in physics in

Which of the following is not an example of intertial frame

The inside cavity of the black body is

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Practically the quantity v/c is always:

The general theory of relativity treats problems involving

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

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

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

The value of threshold frequency for different metals is

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

S.I. unit of planks constant is

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

Intensity of light determines the:

Photoelectric effect takes place with a photon of:

Newton's law of motion do not hold in

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