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Questions
31 Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not ?
A Lead plate
B Microscope
C Spectrophotometer
D Scintillation counter

Answer: Option [D]
32 Regarding the atom of a chemical elements, the magnetic quantum number refers to
A spin
B size
C shape
D orientation

Answer: Option [D]
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33 Salts of which of the following elements provide colours to fireworks ?
A Strontium and barium
B Chromium and nickel
C Zinc and sulphur
D Potassium and mercury

Answer: Option [A]
34 Which one among the following is called philosopher’s wool ?
A Zinc nitrate
B Zinc oxide
C Zinc bromine
D Zinc chloride

Answer: Option [B]
35 Consider the following statements about acetylene:
I. It is used in welding industry
II. It is a raw material for preparing plastics
III. It is easily obtained by mixing silicon carbide and water of these statements

A I and II are correct
B I and III are correct
C II and III are correct
D I, II and III are correct

Answer: Option [A]
36 Physico-chemical characteristics of water in water sources undergo changes due to
A aquatic fungi
B effluents
C aquatic macrophytes
D evapotranspiration

Answer: Option [B]
37 Consider the following statements:
I. Liquefied natural gas (LNG) is liquefied under extremely cold temperatures and high pressure to facilitate storage or transportation in specially designed vessels.
II. First LNG terminal in India was built in Hassan.
III. Natural gas liquids (NGL) are separated from LPG and these include ethane, propane, butane and natural gasoline.

Which of the statements given above is /are correct?

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

Answer: Option [B]
38 Which one of the following was used as a chemical weapon in the first world war ?
A Water gas
B Carbon monoxide
C Mustard gas
D Hydrogen cyanide

Answer: Option [C]
39 Consider the following statements with reference to the periodic table of chemical elements:
I. Ionisation potential gradually decreases along a period
II. In a group of elements, electron affinity decreases as the atomic weight increases
III. In a given period, electronegativity decreases the atomic number increases

Which of these statements (S) is / are correct ?

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

Answer: Option [B]
40 Which one of the following metals does not form amalgam ?
A Copper
B Zinc
C Magnesium
D Iron

Answer: Option [D]

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