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NEET UG BIOLOGY Multiple Choice Questions (MCQs)

NEET UG BIOLOGY MCQs - Unit 19: Electronic Devices

271. Which of the following is a characteristic property of a semiconductor?

a) It behaves like an insulator at low temperature.
b) It behaves like a conductor at high temperature.
c) It has zero resistance at room temperature.
d) It is always a good conductor of electricity.

Answer: b) It behaves like a conductor at high temperature.

272. In a p-n junction diode, the depletion region is formed due to the interaction between:

a) Free electrons and holes.
b) Electrons and protons.
c) Holes and protons.
d) Positive and negative charges in the p and n regions.

Answer: a) Free electrons and holes.

273. The I-V characteristic of a semiconductor diode in forward bias shows:

a) A negative slope.
b) A positive slope only after a certain threshold voltage.
c) No change in current with voltage.
d) The current is independent of the applied voltage.

Answer: b) A positive slope only after a certain threshold voltage.

274. Which of the following devices is used as a rectifier?

a) Zener diode
b) LED
c) Solar cell
d) Semiconductor diode

Answer: d) Semiconductor diode

275. The current through a diode is zero when it is in:

a) Forward bias only.
b) Reverse bias only.
c) Both forward and reverse bias.
d) None of the above.

Answer: b) Reverse bias only.

276. Which of the following materials is typically used for making a Zener diode?

a) Silicon
b) Germanium
c) Gallium Arsenide
d) Copper

Answer: a) Silicon

277. The characteristic feature of a Zener diode is that it:

a) Allows current to pass only in forward bias.
b) Breaks down at a certain reverse voltage.
c) Has high resistance in reverse bias.
d) Works as a rectifier in forward bias.

Answer: b) Breaks down at a certain reverse voltage.

278. The function of a Zener diode as a voltage regulator is to:

a) Maintain a constant current.
b) Maintain a constant voltage.
c) Act as a current rectifier.
d) Reduce the amplitude of a signal.

Answer: b) Maintain a constant voltage.

279. Which of the following is the correct working principle of an LED?

a) It emits light when current flows through it in reverse bias.
b) It emits light when current flows through it in forward bias.
c) It emits light when exposed to ultraviolet radiation.
d) It does not emit light.

Answer: b) It emits light when current flows through it in forward bias.

280. In a solar cell, energy is converted from:

a) Mechanical to electrical energy.
b) Electrical to chemical energy.
c) Light to electrical energy.
d) Electrical to light energy.

Answer: c) Light to electrical energy.

281. Which of the following is the primary use of a photodiode?

a) To convert light into electrical energy.
b) To emit light when forward biased.
c) To regulate voltage.
d) To act as a current rectifier.

Answer: a) To convert light into electrical energy.

282. The logic gate which gives a high output only when at least one of the inputs is low is called:

a) AND gate
b) OR gate
c) NOR gate
d) NAND gate

Answer: d) NAND gate

283. In a NOT gate, if the input is high (1), the output will be:

a) High (1)
b) Low (0)
c) Zero
d) Undefined

Answer: b) Low (0)

284. In an AND gate, the output will be high when:

a) Any of the inputs is high.
b) All the inputs are high.
c) Only one input is high.
d) None of the inputs is high.

Answer: b) All the inputs are high.

285. The logical operation of a NOR gate is the inverse of which gate?

a) AND gate
b) OR gate
c) NAND gate
d) NOT gate

Answer: b) OR gate

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NEET UG BIOLOGY Multiple Choice Questions (MCQs)

NEET UG BIOLOGY MCQs - Unit 19: Electronic Devices

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