NEET Physics: Questions 1670 - 1673 of 2098

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Question number: 1670

» Electronic Devices » Semiconductor Diode

Assertion-Reason▾

Assertion (Ꭺ)

The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.

Reason (Ꭱ)

It is due to law of mass action.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

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.

2gl(1+cosθ)

b.

2gl(1+sinθ)

c.

2gl(1sinθ)

d.

2gl(1cosθ)

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 T12T22 will be

Choices

Choice (4) Response

a.

56

b.

23

c.

32

d.

65

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