Electronics

JKPSC Assistant Professor (Physics) · Physics · 68 practice questions with answers and explanations: 5 Easy, 63 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The binary number 1011 equals which decimal number?

  1. 10
  2. 13
  3. 9
  4. 11
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Answer: D. 8 + 0 + 2 + 1 = 11.

Sample Easy question 2

The output of an XOR gate is 1 when:

  1. The inputs differ
  2. The inputs are the same
  3. Both inputs are 1
  4. Both inputs are 0
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Answer: A. Exclusive OR.

Sample Easy question 3

The current gain β of a transistor is:

  1. Base to emitter current
  2. Collector to emitter voltage
  3. The ratio of collector current to base current
  4. Emitter to collector current
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Answer: C. β = I_C/I_B.

Sample Medium question 4

The reverse saturation current in a diode is due to:

  1. Minority carriers
  2. Majority carriers
  3. Both equally
  4. Ions
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Answer: A. It is very small.

Sample Medium question 5

The Zener diode is used as a:

  1. Rectifier only
  2. Voltage regulator
  3. Amplifier
  4. Oscillator
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Answer: B. It operates in reverse breakdown.

Sample Medium question 6

A light-emitting diode emits light by:

  1. Recombination of electrons and holes
  2. Absorption
  3. Heating
  4. Reflection
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Answer: A. The colour depends on the band gap.

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