NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1675 - 1678 of 2320

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Question number: 1675

» Electronic Devices » Semiconductors

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Conductivity of a semiconductor increases on doping.

Reason (Ꭱ)

On doping the temperature of the semiconductor increases.

Choices

Choice (4)Response

a.

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

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 false

Question number: 1676

» Oscillations and Waves » Resonance

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MCQ▾

Question

Amplitude of a wave is represented by . Then resonance will occur when

Choices

Choice (4)Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 1677

» Electronic Devices » Semiconductors

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

The resistivity of a semiconductor decreases with temperature.

Reason (Ꭱ)

The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing its resistivity.

Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

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

Question number: 1678

» Oscillations and Waves » Simple Harmonic Motion » Phase

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

In simple harmonic motion, the velocity is maximum, when acceleration is minimum.

Reason (Ꭱ)

Displacement and velocity of S. H. M. differ in phase by

Choices

Choice (4)Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is false but Ꭱ is true

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