A B a Oil spill i helps the sedimentation of suspended particles in water b Ceramic candles i i a water-borne disease c Alum i i i reduces the transmission of light through water d Bleaching powder i v water filter e Typhoid v disinfects water

Oil tankers carry petroleum by sea from one country to another. Oil spills out in tanker accidents or otherwise. The film of oil that floats over the water badly affects the transmission of light through the water body. This affects the process of photosynthesis in aquatic plants. Ceramic candles is act as water filter. It has fine pores which allow only the water to pass through, but not the suspended particles. Alum facilitates the removal of suspended particles from water by sedimentation. The bleaching powder slowly reacts with water to give chlorine, which kills the germs. CaOCl 2 bleaching powder + H 2 O water → Ca ( OH ) 2 calcium hydroxide + Cl 2 chlorine Water is the carrier of several microorganisms that cause common water-borne diseases like typhoid, dysentery, cholera and hepatitis. The microorganisms responsible for these diseases are present in the excreta of infected persons. When the excreta are discharged into a water body, the water body becomes a source of infection and the disease spreads. A B a Oil spill i i i reduces the transmission of light through water b Ceramic candles i v water filter c Alum i helps the sedimentation of suspended particles in water d Bleaching powder v disinfects e Typhoid i i a water-borne disease

E M B I B E

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises

Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Pollution of Air and Water, Exercise 1: Exercises

Author:Amarnath Mishra, Geeta Mehta, Rajesh Mohan & Deepti Lehri

Amarnath Mishra Science Solutions for Exercise - Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Pollution of Air and Water, Exercise 1: Exercises

Attempt the practice questions on Chapter 16: Pollution of Air and Water, Exercise 1: Exercises with hints and solutions to strengthen your understanding. Basic Science for Class 8 solutions are prepared by Experienced Embibe Experts.

Questions from Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Pollution of Air and Water, Exercise 1: Exercises with Hints & Solutions

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q D

_____ is formed by the complete combustion of carbon. (Write the name of the compound)

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q D

An increase in the ${CO}_{2}$ level in the air causes the _____ effect.

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q D

Sculptures, monuments and buildings are _____ by acid rain. (preserved / eroded)

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q E

The ozone layer in our atmosphere protects us from the bad effects of

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q E

Which of the following is an oxygen-demanding waste?

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q E

Which of the following is/are used for disinfecting water?

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q E

Reverse osmosis is used for the purification of

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 16 - Pollution of Air and Water>Exercises>Q F

A	B
$(a)$ Oil spill	$(i)$ helps the sedimentation of suspended particles in water
$(b)$ Ceramic candles	$(i i)$ a water-borne disease
$(c)$ Alum	$(i i i)$ reduces the transmission of light through water
$(d)$ Bleaching powder	$(i v)$ water filter
$(e)$ Typhoid	$(v)$ disinfects water

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