Entry Test MCQ :: Modern Physics

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31.

In Davisson-Germer experiment the diffracted proton from crystal shows

A.	Particle property	B.	Wave property
C.	Light property	D.	Quantum property

32.

If a diffraction grating is placed in the path of a light beam it reveals

A.	Wave property	B.	Particle property
C.	Energy particle	D.	Electromagnetic wave property

33.

In electron microscope we use energetic particles because of

A.	Penetrating power is high	B.	Kinetic energy is large.
C.	Wavelength is very short.	D.	All the above reasons.

34.

In electron microscope electric & magnetic fields are used as

A.	Electromagnetic gun.	B.	Source of electromagnetic waves.
C.	Deflecting charged particle	D.	Converging source of electrons.

35.

A three dimensional image is obtained by

A.	Electron microscope	B.	Seanning electron microscope
C.	Magnetic imaging	D.	None of the above

36.

The uncertainty in momentum & position is due to its

A.	Property of matter and radiation.	B.	Two dimensional motion.
C.	Emission of certain wavelength	D.	Very high velocity.

37.

For confinement of electron in a box of radius 10-14m the electron speed should be

A.	107m/sec	B.	Should be greater than speed of light.
C.	Be zero	D.	Not be wavelike.

38.

The energy radiated is directly proportional to fourth power of Kelvins temperature is

A.	Karl-weins law	B.	Rayleigh Jeans law.
C.	Stephens law.	D.	Plancks

39.

Compton effect proves the

A.	Photon theory of light	B.	Dual nature of light
C.	Wave nature of light	D.	Uncertain nature of light

40.

Electron moves in the orbit as

A.	Simple vibratory motion.	B.	Standing wave motion.
C.	Vibratory motion like up and down.	D.	S.H.M like sound.