Question # 1

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

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

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

All motions are

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Absolute

Uniform

Relative

Variable

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

Max planck received noble prize in:

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1927

1932

1918

1914

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

Einstein photoelectric equation is

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None of these

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

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 mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

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

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Zero

Maximum

Minimum

infinity

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

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

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

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