question_answer1)
Define thrust. Give its SI unit.
question_answer2)
State a condition for an object to float when placed on
the surface of water.
question_answer3)
Why do we prefer a sharp knife for cutting than a blunt
one?
question_answer4)
What are the two forces acting on a body floating in a
liquid?
question_answer7)
What are the factors which affect the buoyant force?
question_answer8)
Why do needles have sharp edge?
question_answer9)
State buoyancy.
question_answer10)
Give the uses of
(a) Lactometer (b) Hydrometer.
question_answer11)
A bucket of water weighs less inside the well water. Why?
question_answer12)
What is relative density?
question_answer13)
Find the force acting on an area of 0.5 m2 will
produce a pressure of 50 Pa.
question_answer14)
Find the mass of 5 m3 of cement of density 3000
kg/m3.
question_answer19)
Find the weight of the object from the following diagram.
question_answer21)
If 100 cc of water is at 20°C, at what temperature its
density will be maximum?
question_answer22)
Density of glass is 3.5 g/cm3. What does it mean?
question_answer26)
What are the least counts of
(a) the spring balance and
(b) measuring cylinder?
question_answer33)
Write two applications of Archimedes' principle.
question_answer34)
Name the force experienced in a fluid. What is the
direction of this force?
question_answer35)
Why does a nail sink in water but a piece of cork floats
on it?
question_answer40)
Why should we keep the base of dams broader?
question_answer41)
State the law of floatation.
question_answer51)
Explain the applications of Archimedes' principle.
question_answer52)
What are the factors affecting buoyant force?
question_answer59)
What
is a fluid?
question_answer60)
What
is specific gravity of a substance?
question_answer61)
What
do you mean by buoyancy?
question_answer62)
What
do you mean by buoyant force?
question_answer63)
In
what direction does the buoyant force on an object immersed in a liquid act?
question_answer64)
What
is the SI unit of buoyant force?
question_answer65)
When
an object is immersed in a fluid, name the two forces acting on it.
question_answer66)
Why
does an egg sink in freshwater but floats in highly salty water?
question_answer67)
What
is the relative density of silver?
question_answer68)
What
is the density of silver, given that its relative density is 10.5?
question_answer71)
What
do you mean by thrust?
question_answer72)
make
use of the concept of pressure.
question_answer73)
What
are the factors which affect the pressure at a point in liquid?
question_answer75)
State
the laws of floatation.
question_answer77)
State
the laws of liquid pressure.
question_answer78)
State
the factors on which buoyant force depends.
question_answer79)
Give
any three applications of Archimedes' principle.
question_answer80)
How
is a submarine able to move on as well as go under water?
question_answer81)
Why
does an object float or sink when placed over the surface of water?
question_answer84)
Why
does a block of plastic released under water come up to the surface of water?
question_answer88)
(i)
Give an application of density.
(ii) What are its units?
question_answer94)
Why does a sharp knife cut better than
a blunt knife?
question_answer95)
Why is the tip of the needle sharp?
question_answer99)
Why do snow shoes stop you from sinking
into snow?
question_answer102)
Why does the driver wear metallic cover
while going into the sea?
question_answer103)
Why are the walls of a dam made thick
at the bottom and thin up wards?
question_answer104)
Why is it easier to float in sea water
than in river water?
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