Previous Year Paper year:2009 : ICSE-X-Physics

Home Learn Fast select Course

Change Unit Change Subject Last Menu

ICSE-X-Physics

Previous Year Paper year:2009

with Solutions - page 3

#3-e-i
Give two characteristic properties of copper wire which make
it unsuitable for use as fuse wire.

#3-e-ii
Name the material which is used as a fuse wire?
Ans : Fuse wires are generally made up of an alloy of tin and lead.

#4

#4-a [2]
The figure below shows an electromagnet.

#4-a-i
What will be the polarity at the end X?
Ans : North (I = anticlockwise)

#4-a-ii
Suggest a way by which the strength of the electromagnet
referred to in the question, may be increased.
Ans : It can be increased by increasing the strength of current or even by increasing the number of turn of the coil.

#4-b [2]
Why do pieces of ice added to a drink cool it much faster than
ice cold water added to it ?
Ans : Due to extra latent heat of fusion of ice i.e., 336 J/gm.
∴ each gram of ice takes 336 J of extra heat from drink.

#4-c [2]
40 g of water at 60oC is poured into a vessel containing 50 g of
water at 20oC. The final temperature recorded is 30oC.
Calculate the thermal capacity of the vessel. (Take specific heat
capacity of water as ``\pu{4.2 J g-1 °C-1}``).
Ans : Heat lost by hot water = Heat gained by cold water + Heat gained by vessel
mc △T = me △T + Heat capacity x rise in temperature (△t)
40 x 4.2 x (60 - 30) = 50 x 4.2 x (30 - 20) + Heat capacity x 10
Heat capacity = 294 J/°C.

#4-d [2]
Give two important precautions that should be taken while
handling radioactive materials.
Ans : (i.) Radioactive materials should be kept in thick lead container with a narrow opening.
(ii.) Lead gloves and aprons must be used.

#4-e [2]

#4-e-i
What is the name given to atoms of a substance which have
the same atomic number but different mass numbers?
Ans : Isotopes.

#4-e-ii
What is the difference in the atomic structure of such
atoms?
Ans : It is same only the no. of nucleons are more i.e., neutrons are more, while the electrons are same.

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

#5

#5-a
``\pu{ 6.4 kJ }`` of energy causes a displacement of 64 m in a body in the
direction of force in 2.5 seconds. Calculate (i) the force applied
Ans :