NEET Physics: Questions 1641 - 1644 of 2142

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Question number: 1641

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

Two PN-j unctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be

Two PN junctions connected in series.

Two PN Junctions Connected in Series.

In figure two PN junctions are connected in series by three different methods.

Choices

Choice (4) Response

a.

In the circuit (1) and (2)

b.

In the circuit (2) and (3)

c.

In the circuit (1) and (3)

d.

Only in the circuit (1)

Question number: 1642

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

Ohm’s law is obeyed by semiconductors only in low electric fields.

Reason (Ꭱ)

Ohm’s law is not same for weak field and strong electric fields.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 1643

» Electronic Devices » Semiconductors

MCQ▾

Question

Choose the correct statement

Choices

Choice (4) Response

a.

When we heat a semiconductor its resistance decreases

b.

When we heat a semiconductor its resistance increases

c.

Resistance of a semiconductor is independent of temperature

d.

When we cool a semiconductor to 0 K then it becomes superconductor

Question number: 1644

» Electronic Devices » Semiconductors

MCQ▾

Question

Which statement is correct?

Choices

Choice (4) Response

a.

N-type and P-type germanium are neutral

b.

N-type and P-type germanium are negatively charged

c.

N-type germanium is positively charged and P-type germanium is negatively charged

d.

N-type germanium is negatively charged and P-type germanium is positively charged

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