Question

DAV chamba
Class 8 Science
MM20
Earthquake and Air pollution
*Required
Name *
Roll number *
1.The waves produced on the earth’s surface is called
1 point
seismic wave
longitudinal wave
Heat waves
Sound waves
2.The power of an earthquake is expressed in terms of magnitude on a scale called
1 point
Righter scale
Earth scale
Richter Scale
Meter scale
3.The movement of the earth’s plates causes
1 point
cyclones
Thunderstorm
Earthquakes
Lightening
4. Area falling on the joints of seismic points are
1 point
Safe zone
High zones
Fault zones
Protected zones
5.Tsunami means
1 point
earthquake
Floods
Earthquake under sea
Eruption of volcano under sea
6.A Place of origin of an earthquake inside the earth is called
1 point
Seismic focus
Epicenter
Seismic waves
Faults
7. The richter scale 5.6to7 indicates the earthquake is
1 point
Disastrous
Very strong
Strong
Wild
8. Most structures gets destroyed when the reading of the earthquake on richter scale is
1 point
0-3
3-5
5-7
8-10
9.Movement of the tectonic plates is due to the
1 point
Convection current set up by molten magma
Conduction of haet
Preence of minerals like iron
All of these
Other:
10 . Match the following:- a) CFC's i) reduce the emmition of greenhouse gases b)Deforestation ii) Clean fuel c) Kyoto protocol iii) non-polluting d) Sulphuric acid iv) increase in level of Carbon dioxide e) CNG v) acid rain f) Hydro Power vi) damage to ozone layer
3 points
a-iv, b-vi, c-iii, d-i, e-v, f-ii
a- ii, b-iv, c- i,d- vi, e- v, f-iii
a-vi, b-iv, c-i, d-v, e-ii, f-iii
a-iii, b-i, c-ii, d-v, e-iv, f-vi
11. The gas is responsible for global warming is
1 point
Carbon monoxide
Carbon dioxide
Nitrogen
oxygen
12. The exhaust of vehicles release
1 point
Particulate matter
Soot
Carbon monoxide
All of these
13. The gas that mixes with blood and prevents it from carrying oxygen is_______
1 point
Carbon dioxide
Carbon monoxide
Nitrogen dioxide
Sulphur dioxide
14. Polar ice caps are melting due to
1 point
Acid rain
Global warming
Depletion of the ozone layer
All of these
15. Substances that cause pollution are called
1 point
Pollutants
Sediment
Gravel
None of these
16. The ____________convert the ozone into oxygen and create hole in the ozone layer
1 point
CNG
CFC
Global warming
Green house effect
17. (A): Acid rain reduces the fertility of the soil.Reason (R): Acid rain has a corroding effect on marble buildings.
2 points
Both assertion and reason are correct and reason is the correct explanation of assertion
Both Assertion and Reason are correct but Reason is not correct explanation for Assertion
Assertion is correct and reason is incorrect
Assertion is incorrect and reason is correct​

Answer 1

Answer:

1 seismic waves

2 Richter scale

3 earthquakes

4 fault zones

5 earthquake under sea

6 epicenter

7 very strong

8 8 to 10

9 all of these

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