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) 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
The correct answers to the above question in:
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.
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Question : 1
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 : 2
Which of the following statements, is not correct, about glass?
a) The silicate units in glass are arranged in a way that is quite similar to the arrangement found in liquids.
b) There is no definite melting point for glass.
c) Because of its high viscosity glass exists in solid state
d) Glass is a solid because it has a regular crystalline arrangement.
Answer »Answer: (d)
Question : 3
Which one among the following is the main ingredient in cement?
a) Clay
b) Limestone
c) Gypsum
d) Ash
Answer »Answer: (b)
The composition of cement is CaO (lime) or limestone 62%, silica (SiO2) 22%, alumina (Al2O3) 7.5%, magnesia (MgO) 2.5%, etc.
Thus, limestone is the major raw material for cement.
Question : 4
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 : 5
Soaps are
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
Answer »Answer: (b)
Question : 6
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.
${CaC_2 + N_2} ↙ {Cal.Carbide} ⟶ {CaCN_2 + C} ↙ {Nitrolim}$
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