Class 8

Sound question bank (Science)

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Q1.

A pendulum oscillates $40$ times in $4\text{ seconds}$. Find its frequency and time period:

(A)

$\text{Frequency} = 4\text{ Hz}, \text{Period} = 0.25\text{ s}$

(B)

$\text{Frequency} = 10\text{ Hz}, \text{Period} = 0.1\text{ s}$

(C)

$\text{Frequency} = 160\text{ Hz}, \text{Period} = 0.1\text{ s}$

(D)

$\text{Frequency} = 10\text{ Hz}, \text{Period} = 10\text{ s}$

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Q2.

In the chapter 'Sound', which scientific principle governs 'Production of Sound by Vibrating Bodies'?

(A)

Superstition and myth

(B)

Empirical evidence, conservation laws, and repeatable experimental observations in Production of Sound by Vibrating Bodies

(C)

Aristotelian unverified claims

(D)

Random molecular movement without thermodynamics

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