Question 1 :
Choose the sources which cause air pollution due to suspended particulate matter.
Question 2 :
Which refineries are a major source of gaseous pollutants like sulphur dioxide and nitrogen dioxide?
Question 3 :
A lot of oxygen in the water body gets used up. This results in a decrease in the oxygen level which may kill-
Question 5 :
Which method is a commonly used chemical method for purifying water?
Question 7 :
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is ________.
Question 8 :
The smog causes breathing difficulties such as _____ , ______and ______ in children.
Question 9 :
State True or False.
Carbon monoxide is produced by complete burning of fuels such as coal, petrol, diesel.
Question 10 :
The bacteria present in the faeces of mammals are indicators of
Question 12 :
State True or False.
It is not only living organisms that get affected by polluted air but non-living things like buildings, monuments and statues also get affected.
Question 14 :
The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the -
Question 15 :
Smoke may contain ______ which combine with other air pollutants and fog to form smog.
Question 17 :
$CO_{2}$ traps heat and does not allow it to escape into ______
Question 18 :
While brushing your teeth, leaving the tap running may waste ______
Question 19 :
State True or False.
The sources of air pollutants are factories, power plants, automobile exhausts and burning of firewood and dung cakes.
Question 20 :
Which of the following is not a source of air pollution?
Question 21 :
Water is becoming scarce due to increase in which of the following activities?
Question 23 :
Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is______.
Question 24 :
Acid rain corroding the marble of the monument is called _____
Question 25 :
The excessive quantities of chemicals released in water acts as nutrients for the growth of which organism?
Question 26 :
Gases like methane, nitrous oxide contribute towards rising temperature of earth's atmosphere. What are they called?
Question 27 :
Lakhs of trees are planted every year in July. This event is called as-
Question 32 :
Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?
Question 33 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Whenever harmful substances such as 'wagese', toxic chemicals, silt, etc. get mixed with water, the water becomes 'potdulle'.
Question 34 :
Incomplete combustion of fuel such as petrol and diesel gives ______.
Question 37 :
Once the algae in water die, they serve as a food for decomposers like -
Question 39 :
How much % of the world’s population is without safe drinking water?
Question 41 :
By volume, about __% of the air mixture is nitrogen and about __% is oxygen.
Question 42 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Carbon dioxide, 'thaneme', nitrous oxide and water vapour are known as 'heengrouse sesga'.
Question 43 :
The average temperature of the earth’s atmosphere is gradually increasing. What is it called?
Question 44 :
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called _____.
Question 45 :
World Wide Fund for Nature (WWF) found that Ganga is one of the ten most _____ rivers in the world.
Question 46 :
State True or False.
A brick kiln emits lot of smoke and other harmful gases causing air pollution.
Question 47 :
Which substance is used in refrigerators, air conditioners and aerosol sprays?
Question 48 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, 'nobrac moondexi' and 'mosek'.
Question 49 :
The Ganga at which part in Uttar Pradesh (U.P.), has one of the most polluted stretches of the river?
Question 50 :
Carbon monoxide is a poisonous gas. It reduces the _____ carrying capacity of the blood
