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

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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	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, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	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
5	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
6	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
7	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
8	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
9	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
10	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

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

0.1 kg mass will be equivalent to the energy

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

Photocell is a device which converts

Wien's constant is measured in:

Electromagnetic -radiation means:

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

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

In photoelectric effect the energy of ejected electrons depend on

Which one of the following physical quantities changes with relativistic speed

Intensity of light determines the:

Which of the following is not an example of intertial frame

The concept of direction and position are purely

Position was discovered by Carl Anderson in

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

Davision and Germer performed experiment to verify

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

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

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

When the atomic particle are moving with velocities approaching that of light:

The existence of position was predicted by Dirace in

The energy of photon 'E' is proported to

The value of threshold frequency for different metals is

According to the special theory of relativity

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

If a body reaches a speed equal to the speed of light, then its mass will became

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

Newton's law of motion do not hold in

The inside cavity of the black body is

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

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ECAT Physics Chapter 19 Important MCQ's

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