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Electronics
5 Class 12 Physics questions with answers and explanations.
Printable worksheet with answer key
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In an n type semiconductor the majority carriers are:
- 1 Neutrons
- 2 Holes
- 3 Electrons
- 4 Protons
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A p n junction diode conducts when it is:
- 1 Heated only
- 2 Reverse biased
- 3 Forward biased
- 4 Never
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Correct answer: Forward biased
Forward bias lowers the barrier and lets current flow.
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A transistor can act as an:
- 1 Only a resistor
- 2 Amplifier or a switch
- 3 Only a battery
- 4 Only a capacitor
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Correct answer: Amplifier or a switch
It can amplify signals or switch current on and off.
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An operational amplifier has an ideal input resistance of:
- 1 Zero
- 2 1 ohm
- 3 100 ohm
- 4 Infinity
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A NAND gate output is 0 only when:
- 1 Both inputs are 1
- 2 Both inputs are 0
- 3 Inputs differ
- 4 Any input is 1