NEET Physics: Questions 1748 - 1750 of 2098

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Question number: 1748

» Oscillations and Waves » Free Forced and Damped Oscillations

MCQ▾

Question

A simple pendulum of length L and mass (bob) M is oscillating in a plane about a vertical line between angular limits – ϕ and + ϕ. For an angular displacement θ (| θ| < ϕ), the tension in the string and the velocity of the bob are T and v respectively. The following relations hold good under the above conditions.

(1) TMgcosθ=Mv2L

(2) Tcosθ=Mg

(3) The magnitude of the tangential acceleration of the bob aT =gsinθ

(4) T=Mgcosθ

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1, 2 and 3 are correct

Question number: 1749

» Oscillations and Waves » Periodic Motion - Period Frequency

MCQ▾

Question

A mass m = 100 gm is attached at the end of a light spring which oscillates on a frictionless horizontal table with an amplitude equal to 0.16 meter and time period equal to 2 sec. Initially the mass is released from rest at t = 0 and displacement x =-0.16 meter. The expression for the displacement of mass at any time t is,

Choices

Choice (4) Response

a.

x=0.16sin(πt+π)

b.

x=0.16sin(πt+π)

c.

x=0.16cos(πt)

d.

x=0.16cos(πt)

Question number: 1750

» Oscillations and Waves » Speed of a Wave

Assertion-Reason▾

Assertion (Ꭺ)

When temperature remains constant, change in air pressure do not affect the speed of sound.

Reason (Ꭱ)

Speed of sound is proportional to the square root of pressure.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is false but Ꭱ is true

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