Answer:
(a) There is little attraction
between particles of gas. Thus, gas particles move freely in all directions. Therefore,
gas completely fills the vessel in which it is kept.
(1)
(b) Particles of gas move
randomly in all directions, at high speed. As a result, the particles hit each other
and also hit the walls of the container witha force. Therefore, gas exerts
pressure on the walls of the container.
(1)
(c) A wooden table has a
definite shape and volume. It is very rigid and cannot be compressed i.e., it has
the characteristics of a solid. Hence, awooden table should be called a
solid. (1)
(d) Particles of air have large
spaces between them. On the other hand, wood has little space between its
particles. Also, it is rigid. For this reason, we can easily move our hands in
air, butto do the same through a solid block of wood, we need a karate expert.
(2)
Or
(a) We can take (any one or
more) the following steps
(i) Dry it under the fan.
(ii) Use hanger for exposing its
larger surface toair.
(iii) Dry in sun.
(iv) Use
iron. (2)
(b) Priyanshi would be more
comfortable. The reason is that cotton absorbs sweat from the body and provides
it a larger surface area for evaporation. Increased evaporation causes more, cooling
effect.
Nylon does not absorb sweat so
the sweat doesnot evaporate and Ali would feel uncomfortable. (1+2)
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