question_answer2)
Why
are liquids more compressible than solids?
question_answer3)
Why
a gas cylinder cannot be half-filled?
question_answer4)
Why
water is a liquid at room temperature?
question_answer5)
Give
full forms of LPG.
question_answer6)
Why
is an iron rod solid at room temperature?
question_answer7)
Which
characteristic of a gas is used in supplying oxygen cylinders to hospitals?
question_answer8)
At
what temperature, do solid ice and liquid water co-exist together?
question_answer9)
Mention
two ways to liquefy atmospheric gases.
question_answer10)
How
do three states of matter arise?
question_answer11)
Why
should wet clothes be spread while drying?
question_answer12)
Why
do liquids take up the shape of the container in which they are kept?
question_answer14)
Name
three states of matter. Which state of matter is rigid and why?
question_answer17)
List
any two properties of particles of matter?
question_answer18)
Convert
370 K into Celsius scale.
question_answer20)
What
is plasma?
question_answer21)
Why
does the level of water not change when sugar is dissolved in water?
question_answer22)
Rubber
band changes its shape. Is it solid?
question_answer24)
Why
do liquids show the phenomenon of diffusion to more extent than solids?
question_answer25)
Why
do liquids flow?
question_answer26)
What
is meant by latent heat of vaporisation?
question_answer27)
A
sponge can be compressed. Is it solid or not?
question_answer28)
Why
do liquids have mostly lower density than solids?
question_answer29)
What
would be the effect of temperature on the rate of diffusion of liquids?
question_answer30)
Why
is boiling called a bulk phenomenon?
question_answer31)
Why
do gases exert more pressure on the walls of the container than the solids?
question_answer32)
Name
the process by which a drop of 
spreads in a
beaker of water?
question_answer34)
What
happens to the melting point of ice when pressure is increased?
question_answer35)
What
happens to the melting point of solids with the increase in pressure?
question_answer36)
What
is the latent heat of fusion of ice?
question_answer38)
Which
conditions will increase the evaporation of water?
question_answer40)
Name
the two gases which are supplied in compressed form in homes and hospitals.
question_answer42)
Osmosis
is a special kind of diffusion.
Comment.
question_answer44)
Carbon
dioxide
is a gas. Justify the given statement
by two reasons.
question_answer50)
Give
one similarity and one dissimilarity between a liquid and a gas.
question_answer52)
It
is not proper to regard the gaseous state of ammonia as vapours. Explain.
question_answer55)
Out
of two gases carbon dioxide 
and methane 
which gas would diffuse rapidly?
question_answer56)
Give
two ways in which melting and boiling points can be useful.
question_answer71)
Why do solid substances not
diffuse?
question_answer73)
Name the process which
occurs when a drop of dettol is added to water.
question_answer76)
Which of the following
diffuses faster? Water vapour, wax or, ethyl alcohol.
question_answer77)
What is dry ice? Write its
chemical formula.
question_answer78)
How does perspiration help
to maintain the body temperature in summer?
question_answer79)
In what ways are materials
different from each other?
question_answer80)
Is there any similarity in
materials?
question_answer81)
Can materials exist in all
the three states?
question_answer84)
What is the physical state
of water at:
(a) 25°C (&) 0°C
(c) 1 [NCERT]
question_answer86)
Define density and give its
SI unit.
question_answer88)
Why do the gases exert more
pressure on the walls of the container than solids?
question_answer90)
Suggest a method to liquefy atmospheric
gases. [NCERT]
question_answer91)
Why does a desert cooler
cool better on a hot dry day? [NCERT]
question_answer95)
Design an experiment to show
that ammonium chloride undergoes sublimation.
question_answer101)
Why steam at 100°C is better
for heating purposes than water at 100°C?
question_answer103)
What type of clothes should
we wear in summer? [NCERT]
question_answer107)
A diver is able to cut
through water in a swimming pool. Explain. [NCERT]
question_answer109)
How does evaporation differ
from boiling?
question_answer113)
Why do we feel comfortable
under a fan when we are perspiring?
question_answer116)
Why do solids have a regular
geometrical shape?
question_answer117)
Why are gases compressible
but not liquids?
question_answer118)
Why do wet clothes dry
quickly in the sun than in the shade?
question_answer119)
Why do trees acquire more
leaves during summer?
question_answer120)
Can a rubber band change its
shape on stretching? Is it a solid?
question_answer121)
Give two ways in which
melting points and boiling points can be useful.
question_answer130)
Describe an activity to
determine the boiling point and melting point of ice.
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From the graph answer the following.
(i) What is the physical state of the substance at the
points A,B,C, and D?
(ii) What is the melting point of the substance?
(iii) What is its boiling point?
(iv) Which portions of the graph indicates that change of
state is taking place?
(v) Name the terms used for heat absorbed during change of
states involved in the above processes.
Rahul observes the changes in temperature at different
intervals as follows
I. For the first time interval 
Which region contains all liquids?
(a) Name the changes in the terms of process P, Q, R and
S.
(b) Which of the changes are exothermic
and endothermic?
Draw the arrangement of particles of
position 'X' and 'Y' when the lamp is burning.
(i)
Which region contains only solid?
(ii)
Which region contains all liquids?
(iii)
Which region shows latent heat of vaporisation? 
