NEET Physics: Questions 1717 - 1721 of 2098

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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 ω=π3rads . 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: 1717 (3 of 3 Based on Passage) Show Passage

» Oscillations and Waves » Longitudinal and Transverse Waves

MCQ▾

Question

Sound emitted by the source at two successive instants t 1 and t 2 has minimum and maximum observed pitch respectively, then -

Choices

Choice (4) Response

a.

t1=3s,t2=11s

b.

t1=1s,t2=5s

c.

t1=5s,t2=11s

d.

t1=5s,t2=7s

Question number: 1718

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

Assertion-Reason▾

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 but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 1719

» Oscillations and Waves » Wave Motion

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.

0.89 m

b.

1.11 m

c.

0.56 m

d.

1.29 m

Question number: 1720

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

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.

2πmeters

b.

gmeters

c.

gkmeters

d.

kgmeters

Question number: 1721

» Oscillations and Waves » Simple Harmonic Motion » Phase

MCQ▾

Question

The path difference between the two waves y1=a1sin(ωt2πxλ) and y2=a2sin(ωt2πxλ+ϕ) is

Choices

Choice (4) Response

a.

λ2π(ϕ+π2)

b.

2πλϕ

c.

λ2πϕ

d.

2πλ(ϕπ2)

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