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) K
(b) C
(c) B1
(d) A
The correct answers to the above question in:
Answer: (b)
Scurvy (bleeding of gums) is caused due to deficiency of vitamin ‘C’ (ascorbic acid).
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Question : 1
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 : 2
By which one among the following mechanisms, soap removes dirt (soil) from cloth?
a) Soap takes away the oily part of the soil and thus separates the soil from the cloth
b) Soap reacts with soil and converts them into soluble silicates
c) Soap dissolves the soil as such
d) The soap molecules bind with the soil, lift the soil and keep it suspended which can then be rinsed away
Answer »Answer: (d)
The soap molecules form micelle around the dirt particles preventing them from coming together and forming aggregates, which form emulsions in water.
The hand rubbing or the agitation cause dispersion of the dirt particles throughout the soapy water. These are washed away with water along with dust particles.
In this way, dirt is removed from the surface of the cloth.
Question : 3
Consider the following statements
- Soap cannot be used in acidic water.
- Ionic part of a soap is —COO– · Na+ .
- Soap dissolves in water faster then detergent.
a) 3 only
b) 2 and 3
c) 1 and 2
d) 1 only
Answer »Answer: (c)
Detergent dissolves in water faster than soap.
Question : 4
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 : 5
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 : 6
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.
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