NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1643 - 1647 of 2184

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Question number: 1643

» Electronic Devices » Semiconductors

Edit
Assertion-Reason▾

Question

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 false

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 1644

» Electronic Devices » Semiconductors

Edit
MCQ▾

Question

Choose the correct statement

Choices

Choice (4) Response

a.

When we heat a semiconductor its resistance increases

b.

Resistance of a semiconductor is independent of temperature

c.

When we heat a semiconductor its resistance decreases

d.

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

Question number: 1645

» Electronic Devices » Semiconductors

Edit
MCQ▾

Question

Which statement is correct?

Choices

Choice (4) Response

a.

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

b.

N-type and P-type germanium are neutral

c.

N-type and P-type germanium are negatively charged

d.

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

Question number: 1646

» Electronic Devices » Semiconductors

Edit
MCQ▾

Question

At zero Kelvin a piece of germanium

Choices

Choice (4) Response

a.

Becomes good conductor

b.

has maximum conductivity

c.

Becomes bad conductor

d.

Becomes semiconductor

Question number: 1647

» Oscillations and Waves » Displacement as a Function of Time

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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 , will be

Choices

Choice (4) Response

a.

5.46 cm

b.

c.

2 cm

d.