Question 7

The components of air which are harmful to living beings are :

a) Nitrogen.

b) Water vapour.

c) Dust and smoke.

d) Carbon dioxide.

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Solution

Dust and smoke are the components of air which are harmful to the living beings. They can cause respiratory problems.

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Similar questions

Q. The components of air which are harmful to living beings are:

Q. Which of the following is not a component of air that we normally breathe in -
(A)Oxygen
(B) Water vapour
(C)Carbon-dioxide
(C) Nitrogen

Question 7

Clouds are

(a) tiny drops of water floating in air
(b) mixture of dust and water vapour
(c) particles of water vapour
(d) rain drops in air

Which of the following will be reduced in air in a city forest when a lot of dust and fly ash is emitted by a coal-based factory in the vicinity?

(a) nitrogen

(b) carbon dioxide

(d) water vapour

Question 21
Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by___ substances which have a ___ effect on both the ___ and ___, it is referred to as ___. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ___ are responsible for causing ___ pollution. Petroleum ___ are a major source of ___ pollutants like ___ and ___. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ___ your teeth, leaving the ___ running may waste several ___ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for ___ is called ___ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ___and ___ impurities. (insects, microorganism, particles, dissolved, harmful).

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Question 7 The components of air which are harmful to living beings are : a) Nitrogen. b) Water vapour. c) Dust and smoke. d) Carbon dioxide.

Dust and smoke are the components of air which are harmful to the living beings. They can cause respiratory problems.

Question 7

The components of air which are harmful to living beings are :

a) Nitrogen.

b) Water vapour.

c) Dust and smoke.

d) Carbon dioxide.