NEET Physics: Questions 1642 - 1646 of 2098

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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

Question number: 1645

» Electronic Devices » Semiconductors

MCQ▾

Question

At zero Kelvin a piece of germanium

Choices

Choice (4) Response

a.

Becomes bad conductor

b.

Becomes good conductor

c.

has maximum conductivity

d.

Becomes semiconductor

Question number: 1646

» Oscillations and Waves » Displacement as a Function of Time

MCQ▾

Question

The amplitude of a particle executing SHM is 5.5 cm. At the mean position the speed of the particle is 20 cm/s. The distance of the particle from the mean position at which the speed of the particle becomes 33cm/s , will be

Choices

Choice (4) Response

a.

23cm

b.

3cm

c.

2 cm

d.

5.46 cm

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