Science Exercise Unit 5 Waste Management

1) The following information shows a situation in a village.
The residents of a village dispose various waste products into a nearby river. At the same time, they also use the water obtained from that particular river for their daily usage.
Which of the following may happen?
I Water pollution
II Food poisioning
III Infection of contagious diseases
A I only
B I and II only
C II and III only
D I, II and III

2) Which of the following methods of disposing waste products can prevent environment pollution?
A Closed burning
B Open burning
C Throwing rubbish into the river
D Collecting rubbish in a particular area

3) Which of the following statements is true about non-biodegradable wastes?
A These wastes cannot be recycled
B These wastes will never be diminished from the environment
C These wastes can be broken down by certain microorganisms
D These wastes produce substances that will be returned to the soil

4) Decaying materials will produce simpler substances such as
A soil and water
B mineral salts only
C nutrients and oxygen
D water and carbon dioxide

5) Which of the following is a type of waste that is carried away form houses?
A Sewage
B Smoke
C Fertilisers
D Toxic materials

6) Which of the following about waste is not true?
A It is a material that is needed by humans
B It can be solid, liquid or gas
C Smoke is a type of waste produced from factories
D. Food remains are solid wase

7) Which of the following can cause acid rain?
I Liquid waste from factories
II Smoke from factories
III Exhaust gas from motor vehicles
A II Only
B I and II only
C II and III only
D I, II and III only

8 ) Which of the following will happen if many people dispose of waste by burning it in the open?
A Water pollution
B Spread of disease
C Air pollution
D Flash floods

9) Which of the following is the most suitable way to dispose of waste that can be decay?
A Recycling
B Throwing into rivers
C Open burning
D Burying in the ground

10) Microorganisms that cause waste to decay are called…
A bacteria
B decomposers
C preservatives
D fungi

Answer of Unit 5
Unit 1
Unit 2
Unit 3
Unit 4
Unit 6
Unit 7