ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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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	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
2	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
3	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
4	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
5	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
6	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
7	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
8	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
9	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
10	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero

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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

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

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

A photon is considered to have

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

0.1 kg mass will be equivalent to the energy

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

The length contraction happens only

A non-inertial frame of reference is one, in which

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

Intensity of light determines the:

S.I. unit of planks constant is

The general theory of relativity treats problems involving

Davision and Germer performed experiment to verify

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

When a platinum wire is heated, it appears white at

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

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

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

The value of threshold frequency for different metals is

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

The unit of work function is:

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

The mass of an object will be doubled at speed

The energy of a photon is represented by

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

The concept of direction is purely:

The existence of position was predicted by Dirace in

Photocell is a device which converts

Electromagnetic radiation or photons interact with matter in

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ECAT Physics Chapter 19 Important MCQ's

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