set 2 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) Ca2 SiO4
(b) Ca3 SiO5
(c) Ca3Al2O6
(d) Ca3 (PO4)2
The correct answers to the above question in:
Answer: (d)
A typical composition for portland cement is CaO, SiO2, Al2O3, Fe2O3, CaSO4 .2H2O.
∴ Ca3 (PO4)2 is not contained in portland cement.
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Read more chemistry test online Based General Science Questions and Answers
Question : 1
Soft soaps are
a) potassium salt of fatty acids
b) sodium salt of fatty acids
c) sodium and potassium salt
d) potassium salt of sulphonic acids
Answer »Answer: (a)
Question : 2
Which substance is used to retard the setting action of cement?
a) CaSO4 , 2H2O
b) Al2O3
c) CaO
d) Na2O + K2O
Answer »Answer: (a)
CaSO4 . 2H2O (gypsum) is added to cement clinker to retard setting action of cement.
Question : 3
Washing soap can be prepared by saponification with alkali of which of the following oil
a) Groundnut oil
b) Paraffin oil
c) Rose oil
d) Kerosene oil
Answer »Answer: (a)
Any oils which are good for eating or cooking, can be used in making soap. One of the best is said to be Coconut oil. Groundnut, shea butter, cocoa butter, sun flower and many other vegetable oils are also used.
Question : 4
When glass is heated, it
a) melts only above 1000°C
b) vapourises
c) does not melt at a fixed temperature
d) None of these
Answer »Answer: (c)
Question : 5
Which one of the following is not present in cement?
a) Alum
b) Alumina
c) Clay
d) Gypsum
Answer »Answer: (a)
Gypsum is added in calculated quantity in order to adjust the rate of setting of cement. Alum is NOT present in cement.
Question : 6
Deficiency of vitamin E causes
a) Hemolytic anemia
b) Scurvy
c) Beriberi
d) None of these
Answer »Answer: (a)
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