NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1671 - 1674 of 2142

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Question number: 1671

» Electronic Devices » Semiconductors

MCQ▾

Question

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that,

Choices

Choice (4) Response

a.

P is conductor and Q is semiconductor

b.

P is n-type semiconductor and Q is p-type semiconductor

c.

P is semiconductor and Q is conductor

d.

P and Q are conductors of different materials

Question number: 1672

» Oscillations and Waves » Simple Pendulum

MCQ▾

Question

The bob of a pendulum of length l is pulled aside from its equilibrium position through an angle θ and then released. The bob will then pass through its equilibrium position with a speed v, where v equals

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1673

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

MCQ▾

Question

A simple pendulum has time period T 1. The point of suspension is now moved upward according to equation y = kt 2 where k = l m/sec 2. If new time period is T 2 then ratio will be

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1674

» Electronic Devices » Semiconductors

Assertion-Reason▾

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 false

b.

Ꭺ is true but Ꭱ is 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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