set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on some important man made materials topic of general science mcq
(a) sodium salts of trihydroxy alcohols
(b) sodium salts of fatty acids containing carbon atoms 16 to 18
(c) sodium salts of sulphuric acids containing carbon atoms 10 to 16
(d) none of these
The correct answers to the above question in:
Answer: (b)
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Question : 1
The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of
a) long chain dicarboxylic acids
b) glycerol
c) long chain monocarboxylic acids
d) long chain tricarboxylic acids
Answer »Answer: (d)
Vegetable oils and animal fats are the main materials that are saponified. These greasy materials, triesters called triglycerides, are mixture derived from diverse long chain tricarboxylic acid.
Question : 2
Which of the following statements about vitamin B12 is incorrect?
a) It is also present in rain water
b) It occurs in plants
c) It has a cobalt atom
d) It is needed for human body in very small amounts
Answer »Answer: (a)
It is found in liver, egg, milk, meat, and fish. Minute amounts are probably present in all animal cells.
Peculiarly, unlike other vitamins, B12 is not found in significant amounts in green plants.
Question : 3
Glass is a transparent substance obtained by heating silica with oxides or carbonates of metals. Glass is a mixture of
a) oxides
b) sulphates
c) phosphates
d) silicates
Answer »Answer: (d)
Question : 4
What is the composition of nitrolim – a chemical fertilizer ?
a) Calcium carbide and carbon
b) Calcium carbide and nitrogen
c) Nitrogen and limestone
d) None of these
Answer »Answer: (d)
Calcium cyanamide (CaCN2) mixed with carbon (C) is called nitrolim.
${CaC_2 + N_2} ↙ {Cal.Carbide} ⟶ {CaCN_2 + C} ↙ {Nitrolim}$
Question : 5
Washing soaps are potassium and sodium salts of
a) mineral acids
b) fatty acids
c) dicarboxylic acids
d) None of these
Answer »Answer: (b)
Question : 6
Which one of the following correctly defines the state of glass?
a) Condensed gas
b) Super cooled liquid
c) Crystalline solid
d) Liquid crystal
Answer »Answer: (b)
Glass is an amorphous, hard, brittle, super cooled liquid.
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