Page 179 - Science Class 06

Ex
Ex
Ex
Ex
Exercise
Exerciseerciseerciseerciseerciseercise
Ex
A. Tick ( ) the correct op on. 3
1. Which of the following is not a domes c waste?
(a) Food waste (b) Edible oil
(c) Paper (d) Chemicals
2. Which of the following comes in rubbish category?
(a) Papers (b) Glass

(c) Metallic utensils (d) All of these
3. Which of the following is not a bio-degradable waste?
(a) Peels of vegetables (b) Clothes
(c) Polythene bags (d) Le over food

4. Which of the following is biodegradable waste?
(a) Mercury (b) Glass
(c) Co on (d) Iron

5. Which of the following cannot be recycled ?
(a) Wood (b) Iron
(c) Glass (d) Plas c
B. Fill in the blanks.

1. Ash is produced from burning of __________________________ , coke, etc.
2. Wastes can be classified into _____________ wastes and _____________ wastes.
3. _____________ and _____________ are two most commonly used methods for waste
disposal.
4. We can reduce the quan ty of wastes through the methods of _____________ and
_____________.
5. All kinds of metal wastes can be_____________ .

C. Write True or False.
1. Gaseous wastes are generated mainly from motor vehicles and factories.
2. Biodegradable wastes are not very harmful for the environment.
3. Non-bidedgradable wastes remain in the environment for many years.

4. Polythene bags are very dangerous for the environment.
5. Compos ng is the best way of waste disposal in which biodegradable wastes are
converted into manure.
D. Very short answer ques ons.
1. What do you mean by wastes?
2. Write important sources of wastes genera on.
3. Write important food wastes.
4. What are biodegradable wastes?

5. What do you mean by decomposers?

Science-6 179