C. State whether True or False :
(a) Earthen pots are better than ordinary vessels to store cold water.
(b) Intervening media plays very important role in radiation
(c) Air and water are good conductors of heat.
(d) Sea and land breezes occur due to currents of air caused by convection
(e) Intermolecular force increases with the decrease in the distance between the
molecules.
Answers
Answer:
(a.) Earthen pots are better than ordinary vessels to store cold water.
ANS. : TRUE..
EXPLANATION : Earthen clay is made up of the natural earthen clay which adds mineral property in water. It also in alkaline nature so it keeps water alkaline which is highly required to our body. Clay pot keeps water cool with its main principle is evaporation.
(b) Intervening media plays very important role in radiation.
ANS. : FALSE..
EXPLANATION : Radiation does not need any intermediate medium.
(c) Air and water are good conductors of heat.
ANS. : FALSE..
EXPLANATION : Air is a bad conductor because, to conduct heat current molecules should absorb heat and transmit it to neighbor by vibrating. This is because water is a poor conductor of heat. Most of the heat will move in a convection current within the water at the top of the test tube, only a small fraction of it will conduct down to the ice cube.
(d) Sea and land breezes occur due to currents of air caused by convection.
ANS. : TRUE..
EXPLANATION : The ground heats the air above it, which rises in convection currents and cooler air from over the ocean flows toward the shore to “fill in the gap” left by the rising warm air. This flow of cooler air from the ocean toward the shore creates what is known as a sea breeze.
(e) Intermolecular force increases with the decrease in the distance between the
ANS. : FALSE..
EXPLANATION : With decrease in intermolecular space, the intermolecular forces increases as force between two particles are inversely proportional to the square of the distance between the two particles.
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Answer:
a - TRUE
b -false
c- false
d- TRUE
e- true