Electric Current and its Effects — Science STD 7 — Question

Why are trees planted alongside the roads?

A cold steel spoon is dipped into a cup of hot coffee, it will transfer heat to its other end or not? If yes then by which process?

State whether the following statements are True or False. If false, write the correct statement: Ocean water cannot be used for domestic purposes.

Write word equations for two chemical reactions with the help of materials given in the box.
Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water.

Name the three processes involved in treatment of wastewater.

How water pollution will be affected with the depletion of forest?

Define wool.

Fill in the blanks:The safety device based on the heating effect of electric current is called a _____.

Name the vein in the body that carries oxygen-rich blood.

Give examples of conductors.