NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1590 - 1593 of 2320

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Question number: 1590

» Electronic Devices » Semiconductor Diode

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MCQ▾

Question

Which of the following materials are crystalline?

(1) Copper (2) Sodium chloride

(3) Diamond (4) Wood

Select the correct answers and mark it according to the following codes:

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 1591

» Electronic Devices » Semiconductors

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MCQ▾

Question

The energy band gap of Si is

Choices

Choice (4)Response

a.

0.70 eV

b.

1.1 eV

c.

Between 0.70 eV

d.

5eV

Question number: 1592

» Electronic Devices » Semiconductors

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

The temperature coefficient of resistance is positive for p-type semiconductors and negative for n-type semiconductors.

Reason (Ꭱ)

The effective charge carries in p-type semiconductors and holes and in n-type semiconductors are electrons.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

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: 1593

» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring

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MCQ▾

Question

Three masses 600g, 300g, and 200g are suspended at the end of a spring are in equilibrium. When the 600g mass is removed, the system oscillates with a period of 4 seconds, when the 300 gm mass is also removed, it will oscillate with a period of

Choices

Choice (4)Response

a.

2 s

b.

1 s

c.

d.

2.53 s

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