Modern Physics Mcqs

This collections of Multiple choice questions and answers focuses on study of Modern Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Modern Physics comprehensively.

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Computer MCQS

Sciences MCQS

2.
A device based on photoelectric effect is called

Photo sensitive detection

Photo diode

Photosynthesis

Photo cell

Answer Discus (0)

3.
A photon is

A unit of energy

A positively charged particle

A quantum of electromagnetic radiation

A unit of wavelength

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4.
A photon of wave length 900nm behaves like a particle of mass

5.53 x 10-36kg

0 kg.

2.46 x 10-36kg

1.84 x 10-44kg

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5.
A three dimensional image is obtained by

Electron microscope

Seanning electron microscope

Magnetic imaging

None of the above

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6.
A transmitting station emits radio waves of wavelength ? at power P. If h is Plancks constant & c the speed of light what is the rate of emission of photons?

C

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7.
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light

Increases because wavelength decreases

Decreases because speed decreases

Remains same

Increases then decreases

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8.
An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is

Greater than one meter

Less than one meter

One meter

A foolish question

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9.
As the temperature of black body is raised the wavelength corresponding to maximum intensity

Shifts towards longer wavelength

Shifts towards shorter wavelength

Remain the same

Shifts towards longer as well as shorter wavelengths

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10.
Compton effect proves the

Photon theory of light

Dual nature of light

Wave nature of light

Uncertain nature of light

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11.
Davison Germer experiment indicates

Interference

Polarization

Election diffraction

Refraction

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12.
Einsteins photoelectric equation is given by

1/2 mvmax2=hf+?

1/2 mvmax2-hf = ?

1/2 mvmax2=hf-?

All of above are correct

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13.
Electron moves in the orbit as

Simple vibratory motion.

Standing wave motion.

Vibratory motion like up and down.

S.H.M like sound.

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

107m/sec

Should be greater than speed of light.

Be zero

Not be wavelike.

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15.
If a diffraction grating is placed in the path of a light beam it reveals

Wave property

Particle property

Energy particle

Electromagnetic wave property

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