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	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
2	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
3	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
4	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
5	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
6	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
7	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
8	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
9	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
10	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927

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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

G.P. Thomson observer experimentally that electrons and neutrons possess

The inside cavity of the black body is

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

The photon of radio-waves has energy of about

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

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

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

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

According to the special theory of relativity, time is

Newton's law of motion do not hold in

There is no way to detect:

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

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

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

Electromagnetic radiation or photons interact with matter in

Practically the quantity v/c is always:

de-Broglies hypthesis was experimentally verified by

Pair production is the phenomenon in which

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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

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

The special theory of relatively treats the problems involving:

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 energy of photon 'E' is proported to

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

In the compton's effect, it is found that the wavelength of incident x-rays is

According to the Max plank, energy is redialed or absorbed in

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Max Planck received the Nobel Prize for his discovery of energy quants in:

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ECAT Physics Chapter 19 Important MCQ's

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