Enfant India International School
Class
-8th Sub.- Physics
M.M.-40
Section -A
1.Fill
in the blanks .
(1×5=5)
(a) The
SI unit of work is ________
(b)
The rate of doing work is called ____
(c)
Atmospheric pressure is maximum at _________
(d) An
iceberg ______ on water.
(5) An
iron needle ______ in water but a ship _______ on water.
2.
Give one word .
(1×5=5)
(a)
The size of naphthalene balls decreases when left open for some time .
(b) Hot
tea cools faster in a saucer than in a cup.
(c)
Principle which governs the floating/sinking of a solid in a liquid .
(d) Ratio
of mass of an object and the volume of that object.
(e) Normal
force per unit surface area .
3. Define
these terms . (1×5=5)
(a) Work (b) A Joule (c) Power
(d) Mechanical
energy (e) A watt
4.
Differentiate between the following.
(1×5=5)
(a) Power
and work
(b) Energy
and power
(c) Thrust
and pressure
(d) Floating
and sinking
(e) Solids
and liquids
Section -B
5.
Answer these questions. (2×10=20)
(a) Arrange
three states of matter in ascending order of intermolecular space.
(b) Give
the value of freezing point of water and boiling point of water.
(c) Define
density and give its unit .
(d) State
the principle of flotation.
(e) What
is submarine? What is it’s working principle?
(f) State
any two effects of a force.
(g) What
is the SI unit of pressure ?
(h) Why
are heavy trawlers fitted with a large number of wheels ?
(i) Explain
that a liquid seeks its own level.
(j) How
is energy related to work ?
