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	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
2	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
3	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
4	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
5	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
6	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
7	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
8	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
9	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
10	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates

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

Converse of pair production is known as

The existence of position was predicted by Dirace in

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

The inside cavity of the black body is

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

When a position comes close to an electron they annihilate into

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

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

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

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

When platinum wire is heated, it appears cherry red at

The idea of quantization of energy was proposed by:

Davision and Germer performed experiment to verify

The unit of work function is:

de-Broglies hypthesis was experimentally verified by

Electromagnetic radiation or photons interact with matter in

At the temperature, a body emits radiation which is principally

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

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

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Photoelectric effect takes place with a photon of:

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

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

An inertial frame is that frame in which

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

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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be