Question # 1

The most refined form of matter is:

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Smoke

Light

Ice

Fog

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

Einstein photoelectric equation is

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None of these

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

Albert Einstein got noble prize in:

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1926

1921

1918

1931

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

When the K.E. of photoelectric is zero, the frequency of incident photon is.

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Less than

greater than

Equal to

Much greater

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

All motions are

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Absolute

Uniform

Relative

Variable

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

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Physics ICS Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

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