Question # 1

The emission of electron from the surface of hot metal is called:

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Ionization

Conduction

Thermionic emission

Convection

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Proton

Electron

A and B are the two inputs of a NOR gate. Its output would be 1 when:

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A = 1, B = 1

A = 0 , B = 1

A = 1, B = 0

A = 0 , B = 0

Big unit of capacitance is:

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Farad

Volt

Watt

Coulomb

SI unit of electric potential is:

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watt

volt

coulomb

joule

What will be the capacitance of capacitor by joining them in parallel:

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Increased

Much less

Decrease

No change

For the emission of electrons from the tungsten filament the values of current and voltage are taken as:

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0.1 A and 2V

0.2 A and 4V

0.3A and 6V

0.4A and 8V

The unit of electrical energy is:

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Joule

Watt

Volt

Electron volt(eV)

If the potential energy of none coulomb charge is one joule then its potential will be:

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5 volt

2 volt

3 volt

1 volt

Value of ‘k’ depends upon:

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System of unit

Nature of medium

Both a and b

None of these

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Physics 10th Class English Medium Unit 7 Online Test MCQs With Answers

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