Question

ANSWER THE FOLLOWING. 20×1=20

1. Land fill

a) Is a low lying open area

b) Is a low lying open area, where the garbage collected from a city or town is

dumped

c) Is a place where truck loads of garbage are dumped

d) All of the above are correct

2. In some cities we find dust bins of two different colours for collection of

garbage. These dustbins are usually of which of the following two colours?

a) Green and yellow b) Green and red

c) Blue and red d) Blue and green

3. The red worms used in vermi composting need food like

a) Dead worms b) Plastic bags

c) Broken toys d) Vegetable and fruit wastes

4. There are two heaps of garbage. Heap ‘A’ contains peels of fruits and

vegetables, egg shells, tea leaves, food wastes, etc. Heap ‘B’ contains

polythene bags, aluminium foils, old shoes and broken glassware. Heap ‘A’

and Heap ‘B’ are buried separately indifferent pots and these pots are then

covered with soil. After few days the soil is removed. Which of the two heaps

will appear black in colour and why?

a) Heap A, in it the waste materials have rotten completely

b) Heap B, in it the waste materials have rotten only partly.

c) Both, in both the waste materials have rotten completely

d) Neither A nor B, the waste materials in both of them have rotten only partly

5. Which one of the following substances is easily decomposed by

microorganisms?

a) A plastic comb b) A copper plate

c) A steel bottle d) An apple​

Answer 1

Answer:

23

Explanation: