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Questions
71 Which one of the following elements is essential for the construction of nuclear reactors ?
A Tungsten
B Zirconium
C Nickel
D Cobalt

Answer: Option [B]
72 “The final Agent Orange raid in Vietnam took place in 1970- areas have begun to bloom again. But 19 years after the war`s end, it seems plain that Agent Orange is killing and maiming human beings, something it never intended to do. The apparent toxic fallout from those clouds is a crop of human miseries. Including cancers, miscarriages and birth defects that may persist for decades.”

The offensive substance referred to in this quotation is:

A DDT used as insecticide
B A complex mixture of herbicides and weedicides used to increase agricultural output in the South Vietnam under the U.S. aid programme
C A complex mixture of DDT and other insecticides used at aerial sprays for protection against malaria and other tropical diseases
D Dioxin used as defoliants

Answer: Option [D]
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73 Consider the following:
I. Oxides of Hydrogen
II. Oxides of Nitrogen
III. Oxides of Sulphur

Which of the above causes/ cause acid rain ?

A I and II only
B III only
C II and III only
D I, II and III

Answer: Option [C]
74 Consider the following:
I. Carbon dioxide
II. Oxides of nitrogen
III. Oxides of sulphur

Which of the above is/are the emission /emissions from coal combustion at thermal power plants ?

A I only
B II and III only
C I and III only
D I, II and III

Answer: Option [D]
75 What is the role of ultraviolet (UV) radiation in the water purification systems ?
I. It inactivates/kills the harmfull microorganisms in water.
II. It removes all the undersirable odours from the water.
III. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water

Which of the statements given above is/are correct ?

A I only
B II and III only
C I and III only
D I, II and III

Answer: Option [A]
76 The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is
I. to keep the washing powder dry
II. to maintain the alkalinity of the powder

Which of these statements is /are correct ?

A I only
B II only
C Both I and II
D Neither I nor II

Answer: Option [C]

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