12th class (Fsc) Biology unit 13 MCQs
chapter 13 MCQs 12th Class Biology
Man and His Environment:
1. What is our principal source of energy:
a. Solar energy
b. Nuclear energy
c. Tidal energy
d. Geothermal energy
2. Batteries store, which type of energy:
a. Chemical
b. Electrical
c. Nuclear
d. Mechanical
3. The nuclear power station can last only for about:
a. 30 years
b. 10 years
c. 40 years
d. 20 years
4. A treasure of all types resources essential to maintain life on earth:
a. Land
b. Environment
c. Sun
d. Water
5. In ocean of trophical regions, the temperature of surface water is about:
a. -50 C
b. 50 C
c. 250 C
d. 100 C
6. Air in motion is called:
a. Gas
b. Atmosphere
c. Weather
d. Wind
7. About 95% of our daily energy requirements are fulfilled by:
a. Geothermal energy
b. Nuclear energy
c. Fossil fuels
d. Hydroelectric power
8. Which of the following is a renewable source?
a. Oil and natural gas
b. Oil and air
c. Air and water
d. Water and oil
9. The most widely used source of energy on earth is:
a. Water
b. Wind
c. Geothermal
d. Sun
10. The upper layer of earth crust is:
a. Soil
b. Rock
c. Clay
d. Sand
11. The main reason for extinction of specie is:
a. Habitat destruction
b. Population
c. Parasitism
d. Over population
12. Species which is imminent danger of extinction throughout its range is called:
a. Rare species
b. Scare species
c. Endangered species
d. Threatened species
13. At the time of independence the population of Pakistan was about:
a. 150 million
b. 32.5 million
c. 180 million
d. 50 million
14. Study of human population and their things that affect them is called:
a. Demography
b. Human biology
c. Teratology
d. Sociobiology
15. The world population is expected to be nearly doubled by:
a. 2040
b. 2020
c. 2050
d. 2030
16. Total area of the world under cultivation is:
a. 11%
b. 09%
c. 12%
d. 10%
17. Water present in the form of frozen ice – caps is:
a. 03%
b. 01%
c. 04%
d. 02%
18. Water present in form of frozen ice caps is:
a. 3%
b. 1%
c. 4%
d. 2%
19. The percentage of land under cultivation is:
a. 11%
b. 30%
c. 5%
d. 21%
20. Which of the country has the highest rate of human population?
a. Asia
b. Australia
c. North America
d. Africa
21. If the population is above the carrying capacity what must happen:
a. It can continue to increase
b. It must immediately cure
c. It must eventually decline
d. It can remain stable indefinitely
22. Population of Pakistan in the year 1947 was:
a. 150 million
b. 32.5million
c. 180 million
d. 50 million
23. At the time of independence, the population of Pakistan was about:
a. 150 million
b. 32.5 billion
c. 160 million
d. 32.5 million
24. Which of the following act as environmental buffer?
a. Community
b. Desert
c. Forest
d. Grassland
25. Establishment of new forests, where no forests exist before is called:
a. Reforestation
b. Deforestation
c. Afforestation
d. Desertification
26. Environment buffer is a:
a. Community
b. Desert
c. Forest
d. Grassland
27. The increase of environmental temperature due to high amount of CO2 is known as:
a. Ozone depletion
b. Global warming
c. Stone cancer
d. Acid rains
28. A single chlorine atom can react with ultraviolet rays and destroy as many as ozone molecules:
a. One billion
b. One million
c. Two billion
d. Two million
29. A chemical that kills weed plants is called:
a. Fungicide
b. Pesticide
c. Herbicide
d. Insecticide
30. The befouling of the air by anything that may be harmful to living organism is:
a. Air pollution
b. Water pollution
c. Noise pollution
d. Soil pollution
31. Stone cancer is result of:
a. Air pollution
b. Soil pollution
c. Stone pollution
d. Water pollution
32. The steady internal state of homeostasis is knows as:
a. Normal health
b. Disorder
c. Abnormal health
d. Disease
33. In pure form ozone i:
a. Yellowish
b. Greenish
c. Bluish
d. Reddish
34. The decline in thickness of ozone layer is caused by increasing level of:
a. Chlorine
b. Chlorofluorocarbon
c. Carbon dioxide
d. Nitrogen
35. CFCs are produced by:
a. Air conditioners
b. Moving carts
c. Aeroplanes and refrigerators
d. Industrial machines
36. Ozone in the upper layer of atmosphere that filters:
a. radiation
b. IR radiation
c. a radiation
d. UV radiation
37. Ozone molecule is made by binding of three atoms of:
a. Oxygen
b. Nitrogen
c. Carbon
d. Hydrogen
38. Some detergents contain a lot of:
a. Phosphates
b. Sulphur
c. Carbonates
d. Carbon
39. As CFCs rise to the atmosphere the ultraviolet rays release:
a. Carbon
b. Fluorine
c. Oxygen
d. Chlorine
40. Which disease is due to Mental illness:
a. Beriberi
b. Scurvy
c. Alzheimer
d. Goiter
41. Beriberi is caused by:
a. Nutritional deficiency
b. Infection
c. Chemical Cause
d. Physical disorder
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