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) 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.
The correct answers to the above question in:
Answer: (d)
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Question : 1
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 : 2
One of the properties of glass is its transparency. This property of glass is due to
a) irregular arrangement of silicate units in glass.
b) regular arrangement of silicate units in glass.
c) its high viscosity.
d) its high coefficient of thermal expansion.
Answer »Answer: (a)
Question : 3
Deficiency of vitamin A results in
a) sterility
b) skin diseases
c) lose in apetite
d) retarted growth
Answer »Answer: (d)
In childhood, lack of vitamin A retards growth and hence like other vitamins, it is also said to be a growth-promoting factor.
In mild deficiency, it leads to night blindness. Its prolonged deficiency leads to xerophthalmia.
Question : 4
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 : 5
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 : 6
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.
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