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Class 12 Biology Objective In English Chapter – 16 Environmental Issues
1. Major source of methane is :
(A) Sugarcane plantation
(B) Rice fields
(C) Fruit orchards
(D) Wheat fields
Ans-( B )
2. Rain is called acid rain when its pH is below :
(A) 7
(B) 6.5
(C) 6
(D) 5.6
Ans-( D )
3. Ozone hole is caused by :
(A) Acetylene
(B) Ethylene
(C) Chlorofluorocarbons
(D) Methane
Ans-( C )
4. Green-house effect is due to :
(A) Higher CO2 concentration
(B) Absorption in infra-red gases and dust particles
(C) Both A and B
(D) Rarefaction of atmosphere
Ans-( C )
5. Indicator of SO2pollution is :
(A) Algae
(B) Lichen
(C) Fungi
(D) All of these
Ans-( B )
6. Factors of acid rain are
(A) CO and CO2
(B) NO2 and SO2
(C) CO2 and NO2
(D) N2 and NO2
Ans-( B )
7. Generally threshold of sound intensityfor human is
(A) 20-30 decibel
(B ) 80-90 decibel
(C) 120-130 decibel
(D) 140-150 decibel
Ans-( A )
8. Pollution is rising due to :
(A) research
(B) population explosion
(C) industries and transportation
(D ) rain water
Ans-( C )
9. The environmental protection act ofgovernment of india was passed in:
(A) 1976
(B) 1986
(C) 1966
(D) 1996
Ans-( B )
10. The newspaper contains one of thefollowing toxic materials:
(A) Cd
(B) Pd
(C) Mg
(D) Hg
Ans-( B )
11. Which is the major source of harmfulradiations in the house ?
(A) Tube light
(B) Colour TV
(C) Oven
(D) Heater
Ans-( A )
12. Which one is not produced as exhaustof vehicle ?
(A) SO2
(B) CO2
(C) CO
(D) Flyash
Ans-( D )
13. SO2pollution affects :
(A) Mitochondria
(B) Chloroplast
(C) Golgibodies
(D) ER
Ans-( B )
14. Climate of world is threatened by :
(A) increasing amount of CO2
(B)increasing amount of O2
(C)increasing amount of O3
(D)increasing amount of N2
Ans-( A )
15. Ozone day is celebrated on :
(A) 6 September
(B ) 21 April
(C) 25 December
(D) January 30
Ans-( A )
16. Which is the effect (s) of deforestation
(A) Enhanced CO2concentration
(B) Desertification
(C) Global warming
(D)All of above
Ans-( D )
17. The cause of Minimata disease isdue to poisoing of:
(A) Methyl Mercury
(B) Methyl cyanide
(C) Lead
(D) Copper
Ans-( A )
18. At present the concentration ofatmospheric co2 is:
(A) 100 ppm
(B) 240 ppm
(C) 380 ppm
(D) 520 ppm
Ans-( C )
19. Which is related to ‘Polyblend’ ?
(4) Ahmad Khan
(B) Ramesh Chandra Dagar
(C) Ramdev Mishra
(D) Swaminathan
Ans-( A )
20. Photochemical smog consists of
(A) SO2 PAN and smoke
(B) Ozone, PAN and NO2
(C) Ozone, SO2 and Hydrocarbon
(D)SO2 CO2 and Hydrocarbon
Ans-( B )
21. Snow blindness in human being is caused by
(A) Absorption of UV B radiation
(B) Absorption of infra radiation
(C) Absorption of cosmic radiation
(D) Erosion of cornea by snow
Ans-( A )
22. The thickness of Ozone in a columnof air from the ground to the top of atmosphere is measured in terms of
(A) Dobson unit
(B ) Arab unit
(C) Pascal unit
(D ) None of these
Ans-( A )
23. Which of the following is green house gas?
(A) Methane
(B) CO2
(C) Chloro fluoro carbon
(D ) All of these
Ans-( D )
