Question

I. Fill in the blanks:

1) One to and fro motion of a clock pendulum takes time=__________.

2) Wavelength is measured in _________.

3) We can distinguish a shrill sound from a flat sound by its ________.

4) The weight of a body is measured using________.

5) The sound heard after reflection is ________.

6) Sound travels faster in _______ than in liquids.

7) 36km/h = ______ m/s.

8) Sound requires a ________ for propagation.

9) A ball falls down vertically, its motion is_______.

10) A shriller sound is of ______ pitch.

II. State whether true or false:

1) Loudness depends on frequency.

2) Mass has both magnitude and direction.

3) A ball thrown by a boy from a roof top has oscillatory motion.

4) Sound can travel in vacuum.

5) Larger is the amplitude, feeble is the sound.

6) Mass varies from place to place but weight does not.

7) Female voice is shriller than the male voice.

8) Weight always acts vertically downwards.

9) Sound is a form of energy.

10) A book lying on a table is an example of a body at rest.

III. Define any six of the following:

1) Rectilinear motion

2) Echo

3) Translatory motion

4) Longitudinal wave

5) Vibratory motion

6) Amplitude

7) Frequency

IV. Differentiate any two of the following:

1) Periodic and non-periodic motions.

2) Uniform and non-uniform motions

3) High pitch sound and low pitch sound

4) Mass and weight

V. Answer in one word: [10x1=10]

1) Name the type of motion performed by hands of a clock.

2) State the types of motion in a drill machine.

3) What is the speed of sound in water?

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Answer 1

Answer:

(a) Time taken by an object to complete one oscillation is called time period.

(b) Loudness is determined by the amplitude of vibration.

(c) The unit of frequency is hertz (Hz).

(d) Unwanted sound is called noise.

(e) Shrillness of a sound is determined by the frequency of vibration.

Answer 2

Answer:

1. Fill in the blanks:

1. 2 second

2. lambda

5. echo

6. Air

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