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) Groundnut oil
(b) Paraffin oil
(c) Rose oil
(d) Kerosene oil
The correct answers to the above question in:
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.
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Read more chemistry test online Based General Science Questions and Answers
Question : 1
What is the reason for white cement to be white?
a) It does not contain iron
b) It does not contain silicon
c) It does not contain carbon
d) It does not contain calcium
Answer »Answer: (a)
White cement is white since it does not contain iron.
Question : 2
Scurvy is caused due to the deficiency of vitamin
a) K
b) C
c) B1
d) A
Answer »Answer: (b)
Scurvy (bleeding of gums) is caused due to deficiency of vitamin ‘C’ (ascorbic acid).
Question : 3
Alkaline hydrolysis of esters is known as
a) dehydration
b) saponification
c) esterification
d) alkalination
Answer »Answer: (b)
Alkaline hydrolysis of esters is known as saponification.
$\text"R - COOR' + NaOH ⟶ R 'OH + RCOONa"$
Question : 4
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 : 5
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 : 6
Which one of the following is not contained in portland cement ?
a) Ca2 SiO4
b) Ca3 SiO5
c) Ca3Al2O6
d) Ca3 (PO4)2
Answer »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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