chapter NO 4 Test 3

Student’s Name:____________Admission No.______Roll No._____Section:______
Paper:: Science   Class: 8                   Time Allowed:    One Hour                           Marks: 15 

Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________

Q1. Circle the correct answer.  (10)

1.Deforestation destroys the _________ of wildlife
a) House               b) Community                    c) Habitats                   d) Life
2.These are affecting the environment badly.
a) Air pollutant                    b) Ozone depleting                 c) Human activities                   d) Oxides of nitrogen
3.The effect of ultraviolet radiation is harmful if:
a) Ozone layer is thick                b) Ozone layer is thin             c) carbon dioxide is present                d) Excess of carbon monoxide
4.When it reaches our blood, it reduces its oxygen-carrying capacity.
a) Carbon monoxide               b) Carbon dioxide                 c) Sulphur dioxide               d) Nitrogen dioxide
5.A part of heat energy of sun is reflected by Earth back to:
a) Atmosphere                 b) Earth                    c) Water                  d) Ozone
6.Where we live it is called our.
a) Environment                 b) School                c) House               d) City
7.When acid rain water flowing into fields then it makes the soil.
a) Acidic                    b) Dirty                   c) Fartile                   d) Clear
8.The burning of fuels releases carbon dioxide every year about.
a) 19000 million tons              b) 1800 million tons              c) 1900 million tons                  d) 18000 million tons
9.Which is colorless, odorless and poisonous gas?
a) Carbon monoxide             b) Carbon dioxide               c) Sulphur dioxide                d) Nitrogen dioxide
10.According to experts.
a) 21 % of the total areas of a country must be covered by forests.
b) 22% of the total areas of country must be covered by forests
c) 24% of the total area of a country must be covered by forests
d) 25% of the total areas of a country must be covered by forests

Q2.Write short answers to these questions:          (15)
1.Write about the resources of oxide of nitrogen?
2.What are the main sources of air pollutants?
3.Name the required material for greenhouse?
4.What are the effectskj of Deforstation on the environment ?
5.Describe the effects of deforstation on wildlife?

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