NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1718 - 1722 of 2184

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Passage

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity . Initially observer, source and Centre of the circle are in same line.

Isotropic sphere of radius R.

Isotropic Sphere of Radius R.

In above fig we shows that Sound from a point isotropic source spreads equally in all directions in homogeneous medium

Question number: 1718 (3 of 3 Based on Passage) Show Passage

» Oscillations and Waves » Wave Motion

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MCQ▾

Question

Starting from initial moment, the source moves through an angular displacement 180°. Intensity of the sound as observed by the observer decreases by a factor of –

Choices

Choice (4) Response

a.

2

b.

3

c.

9

d.

4

Question number: 1719

» Oscillations and Waves » Simple Harmonic Motion » Force, Velocity, and Acceleration

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Consider motion for a mass spring system under gravity, motion of M is not a simple harmonic motion unless Mg is negligibly small.

Reason (Ꭱ)

For simple harmonic motion acceleration must be proportional to displacement and is directed towards the mean position.

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.

Both Ꭺ and Ꭱ are false

d.

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

Question number: 1720

» Oscillations and Waves » Wave Motion

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MCQ▾

Question

A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s then wavelength of the tone emitted is

Choices

Choice (4) Response

a.

1.11 m

b.

0.89 m

c.

0.56 m

d.

1.29 m

Question number: 1721

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

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MCQ▾

Question

A ball of the mass 10 kg hangs from a spring and oscillates with time period of 2 π seconds. If the ball is removed the spring shortens by,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1722

» Oscillations and Waves » Simple Harmonic Motion » Phase

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MCQ▾

Question

The path difference between the two waves and is

Choices

Choice (4) Response

a.

b.

c.

d.