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	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
2	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
3	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
4	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
6	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
7	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
8	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
9	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
10	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules

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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

Which of the following is not an example of intertial frame

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

With the help of 50 K v electron microscope, a resolution of

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

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

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 unit of work function is:

Position was discovered by Carl Anderson in

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

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

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

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

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

The concept of direction and position are purely

Davision and Germer performed experiment to verify

Which one of the following physical quantities changes with relativistic speed

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

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

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

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

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

A black body is

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

The concept of direction is purely:

The value of threshold frequency for different metals is

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

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

The special theory of relatively treats the problems involving:

Converse of pair production is known as

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

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ECAT Physics Chapter 19 Important MCQ's

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