Question

Q.2(A). Define the following: (5)
1. Tunnel -__________________
2. Level crossing -___________________
3. Water pollution -___________________
4. Insoluble impurities -___________________
5. Floods -_____________________​

Answer 1

Explanation:

1. burrow for mainly underground animals
2. bridge
3. when water got polluted due to spill waste from factories ,sewage or homes
4. the substance that cannot got dissolved in water or liquid
5. the overflow of water due to deforestion or disastrous affect on nature

Answer 2

Answer:

1. A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end.

2. A level crossing (also called a grade crossing, a railway crossing, or a railroad crossing) is a place where a railway line and a road meet each other on the same level. This means that the grades (the road and the track) are not separated by using a bridge or a tunnel. Usually, there are signs indicating the crossing.

3.Water pollution occurs when harmful substances—often chemicals or microorganisms—contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.                                                                                                                                         4.The usual insoluble impurities are sand, clay, and organic matter. Insoluble suspended matter can be removed by allowing the water to stand and drawing off the clear portions from the sediment, or by filtration.                                                        5.  A flood is an overflow of water that submerges land that is usually dry. ... Floods can also occur in rivers when the flow rate exceeds the capacity of the river channel, particularly at bends or meanders in the waterway. Floods often cause damage to homes and businesses if they are in the natural flood plains of rivers.