Previous Year Paper year:2015 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2015

with Solutions - page 6

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#7-a-i
State the safe limit of sound level in terms of decibel for human hearing.
Ans : The sound level 30 dB to 10 dB has the soothing sensation.

#7-a-ii
Name the characteristic of sound in relation to its waveform.
Ans : Quality (or timbre)

#7-b [3]
A person standing between two vertical cliffs and ``\pu{480 m}`` from the nearest cliff
shouts. He hears the first echo after 3s and the second echo 2s later. Calculate:

#7-b-i
The speed of sound.
Ans :

#7-b-ii
The distance of the other cliff from the person.

#7-c [5]
In the diagram below, A, B, C, D are four pendulums suspended from the same
elastic string PQ. The length of A and C are equal to each other while the length of
pendulum B is smaller than that of D. Pendulum A is set in to a mode of vibrations.

#7-c-i
Name the type of vibrations taking place in pendulums B and D?
Ans : B and D would be in the state of force vibration.

#7-c-ii
What is the state of pendulum C?
Ans : Since the length of pendulum C is same as that of A therefore it is in the state of resonance.

#7-c-iii
State the reason for the type of vibrations in pendulum B and C.
Ans : The pendulum C has its length same as that of A therefore its natural time period is also same that of A and both remain in same phase so resonance takes place. But B's length is lesser than the length of A hence B would vibrate with smaller amplitude.

#8

#8-a [3]

#8-a-i
Name the device used to increase the voltage at a generating station.
Ans : Transformer [step up transformer].

#8-a-ii
At what frequency is AC supplied to residential houses?
Ans : 50 Hz

#8-a-iii
Name the wire in a household electrical circuit to which the switch is connected.
Ans : Live wire.

#8-b [3]
The relationship between the potential difference and the current in a conductor is
stated in the form of a law.