Previous Year Paper year:2018 : ICSE-X-Physics

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ICSE-X-Physics

Previous Year Paper year:2018

with Solutions - page 4

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#3-e-ii
On which type of current do transformers work?
Ans : Transformer runs on alternating current.

#4

#4-a [2]

#4-a-i
Flow can a temperature in degree Celsius be converted into S.I. unit of
temperature?
Ans : K = C + 273
‘C’ is the temperature in degree Celsius and ‘K’ is the temperature in Kelvin,
which is the SI unit.

#4-a-ii
A liquid X has the maximum specific heat capacity and is used as a
coolant in Car radiators. Name the liquid X.
Ans : Liquid ‘X’ is water.

#4-b [2]
A solid metal weighing ``\pu{150 g}`` melts at its melting point of ``\pu{800°C}`` by
providing heat at the rate of ``\pu{100 W}`` . The time taken for it to completely melt
at the same temperature is 4 min. What is the specific latent heat of fusion
of the metal?
Ans : Energy absorbed for melting in 4 min = 100 × 4 × 60 = 24000 J
Specific latent heat of fusion of the metal =
$$\frac{24000}{0.150} = \pu{160 kJ/kg}$$

#4-c [2]
Identify the following wires used in a household circuit:

#4-c-i
The wire is also called as the phase wire.
Ans : The wire also called the phase wire is a live wire.

#4-c-ii
The wire is connected to the top terminal of a three pin socket.
Ans : The wire connected to the top terminal of a three-pin socket is the
earthing wire.

#4-d [2]

#4-d-i
What are isobars?

Ans :
Isobars are two nuclei having the same Mass number (A) but different
Atomic numbers(Z).

#4-d-ii
Give one example of isobars.
Ans : Examples:
$$_{16}^{40}S, _{17}^{40}Cl, _{18}^{40}Ar, _{19}^{40}K, _{20}^{40}Ca$$

#4-e [2]
State any two advantages of electromagnets over permanent magnets.
Ans :
(i) A strong magnetic field is created using an electromagnet, whereas a
permanent magnet gives a weak magnetic field.
(ii) The magnetic field of an electromagnet can be controlled by current,
whereas the magnetic field of a permanent magnet cannot be
changed.

# [40]
Section : II
Attempt any four questions from this Section

#5