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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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
2	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
3	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
4	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
5	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
6	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
7	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
8	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
9	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
10	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

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

Wave nature of particle was proposed by

An inertial frame is that frame in which

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

At the temperature, a body emits radiation which is principally

the dilation of time applies to the timing processes which are:

When a position comes close to an electron they annihilate into photons such that

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

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

Electromagnetic -radiation means:

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

Which one of the following physical quantities changes with relativistic speed

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

As the light shines on the metal surface, the electrons are ejected

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Wien's constant is measured in:

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 special theory of relatively treats the problems involving:

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

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

When platinum wire is heated, it appears cherry red at

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

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

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

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

Absolute motion cannot be detected

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

Intensity of light determines the:

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