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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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	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)
2	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
3	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
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	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
6	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
7	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
8	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
9	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
10	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev

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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

Photocell is a device which converts

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

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

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

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

According to the special theory of relativity

The existence of position was predicted by Dirace in

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

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

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

When a platinum wire is heated, it appears dull red at about

Strictly speaking, the earth is:

The photoelectric effect, the maximum energy of photoelectrons depends on the

A black body is

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

In photoelectric effect the energy of ejected electrons depend on

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

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

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

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

Photoelectric effect takes place with a photon of:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

The energy of a photon is represented by

The mass of an object will be doubled at speed

Which of the following is not an example of intertial frame

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 length contraction happens only

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

Compton derived an expression to find compton shift by applying to the process, the law of conservation 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

Test Questions

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