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

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ICSE-X-Physics

Previous Year Paper year:2015

with Solutions - page 3

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#3-a-i
Give the expression for mechanical advantage of an inclined plane in terms of the
length of an inclined plane.
Ans :

#3-a-ii
Name a common device where a gear train is used.
Ans : Watch is the common device where a gear train is used.

#3-b [2]
The speed of light in glass is ``\pu{2E5 km//s}``. What is the refractive index of glass?
Ans :

#3-c [2]

#3-c-i
Draw a graph between displacement and the time for a body executing free
vibrations.
Ans :

#3-c-ii
Where can a body execute free vibrations?
Ans : In vaccum.

#3-d [2]

#3-d-i
What happens to the resistivity of semi-conductor with the increase of
temperature?
Ans : The resistivity of semiconductor decreases with the increase in temperature.

#3-d-ii
For a fuse, higher the current rating ________ is the fuse wire.
Ans : Thicker.

#3-e [2]

#3-e-i
Name the high energetic invisible electromagnetic waves which help in the study
of the structure of crystals.
Ans : X-rays.

#3-e-ii
State an additional use of the waves mentioned in part (e)(i).
Ans : X-rays are used for detection of fracture in bones, teeth etc.

#4

#4-a [2]
Rishi is surprised when he sees water boiling at 115°C in a container. Give reasons
as to why water can boil at the above temperature.
Ans : Water might have some impurities (eg., salt) dissolved in it. Because the boiling point of liquid (water) increases by the addition of impurities (eg., salt) to it.

#4-b [2]