NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1675 - 1678 of 2142

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Question number: 1675

» Oscillations and Waves » Resonance

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: 1676

» Electronic Devices » Semiconductors

Assertion-Reason▾

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.

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: 1677

» Oscillations and Waves » Simple Harmonic Motion » Phase

Assertion-Reason▾

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.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

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

Question number: 1678

» Oscillations and Waves » Simple Pendulum

Assertion-Reason▾

Assertion (Ꭺ)

The percentage change in time period is 1.5 % if the length of simple pendulum increases by 3

Reason (Ꭱ)

Time period is directly proportional to length of pendulum

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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