B) Write answers to the following questions. ]
1. Why is the density of seawater more than that of rain water?
2. What is the importance of air in transmission of sound?
3. Why is the camel called the 'ship of the desert'?
Answers
1. Sea water has more density than rain water because it contains salt ions. These salt ions make the seawater heavier, which means the mass of the water increases due to the presence of salt ions.
extra :
From the relation, density=mass/volume, we can say that as the mass of an object increases, its density also increases simultaneously.
2. Air acts as a medium for transmission of sound. When a sound wave passes through air, the particles of air vibrate back and forth, parallel to the direction of the sound wave.
extra :
Thus, when a sound wave travels in the horizontal direction, then the particles of the medium also vibrate back and forth in the horizontal direction. Sound cannot travel without a medium and thus we cannot listen to sounds in the vacuum because of absence of air.
3. Camel is called the "Ship of Desert" because it is the only means of transport found in deserts. The body of a camel has undergone various modifications that help it to survive in the hot and dry conditions of the deserts.
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