1) Nitrous oxide, commonly called laughing gas, has been a matter of concern to environmentalists recently because:
A. it is thought to cause cancer at low concentrations.
B. it produces photochemical smog.
C. it is a greenhouse gas.
D. none of the above
Answer : C.
2) Pollination by wind is called
A. autogamy
B. entomophily
C. anemophily
D. ornithophily
Answer : C.
3) The Indian population receives the largest dose of ionizing radiation from:
A. natural sources.
B. fallout from nuclear weapons testing.
C. nuclear medicine.
D. nuclear power plants.
Answer : A.
4) The radioactive element most commonly detected in humans is
A. potassium-40
B. cobalt-60
C. iodine-131
D. plutonium-238
Answer : A.
5) Radioisotopes which are used in medical diagnosis are known as
A. tracers
B. silver bullets
C. markers
D. dyes
Answer : A.
6) Most commercial nuclear power plants worldwide are cooled by
A. sodium
B. mercury
C. helium
D. water
Answer : D.
7) Which of the following materials is used along with iron ore and limestone to produce iron in a modern blast furnace?
A. coke
B. cementite
C. coal
D. bauxite
Answer : A.
8) The study of poisons is called
A. oncology
B. toxicology
C. phrenology
D. ergonomics
Answer : B.
9) What range of frequencies are usually referred to as audio frequencies for humans?
A. 0 to 20 Hertz
B. 20 to 20,000 Hertz
C. 200 to 200,000 Hertz
D. 10,000 to 30,000 Hertz
Answer : B.
10) A device used to measure the amount of moisture in the atmosphere is called a
A. hydrometer
B. hygrometer
C. anemometer
D. barometer
Answer : B.
