Question # 1

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

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

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

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

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 special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

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

Anti particle of electron is

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Proton

Photon

Neutron

Positron

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

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

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Zero

Maximum

Minimum

infinity

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

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