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

Sr.#	Question	Answer
1	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
2	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
3	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
4	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
5	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
6	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
7	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
8	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
9	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
10	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C

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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

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:

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

Victor de-Brogile received the Nobel prize in physics in

The concept of direction is purely:

When platinum wire is heated, it appears cherry red at

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

According to the special theory of relativity, time is

There is no way to detect:

Davision and Germer performed experiment to verify

The unit of work function is:

Photocell is a device which converts

In photoelectric effect the energy of ejected electrons depend on

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

The year when A.H. compton was awarded Nobel Prize is:

The energy of photon 'E' is proported to

According to the special theory of relativity, a moving clock

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

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

Newton's law of motion do not hold in

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

The energy of the 4th orbit in hydrogen atom is

The general theory of relativity treats problems involving

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

Momentum is a parameter associated with

Which one of the following physical quantities changes with relativistic speed

The value of threshold frequency for different metals is

Pair production is the phenomenon in which

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

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

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

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

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