Question # 1

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

The existence of positron was discovered in:

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1929

1928

1931

1933

In the equation if f₂ > then

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Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

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

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Threshold energy

Threshold frequency

Work function

Work ability

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Which one of the following paved the way for modern physics

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Newtonian mechanics

Theory of relativity

Quantum theory

All of above

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

Max planck received noble prize in:

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1927

1932

1918

1914

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

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

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