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) 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
The correct answers to the above question in:
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.
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Read more chemistry test online Based General Science Questions and Answers
Question : 1
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 : 2
Given below is an approximate composition of a substance :
- CaO - 60-70%,
- SiO2 - 20-25%,
- Al2O3 - 5-10%,
- Fe2O3 - 2-3%
a) marble stone
b) cement
c) plaster of Paris
d) quartz
Answer »Answer: (b)
Cement is made up of calcium oxide, silicon dioxide, aluminium tetra oxide and iron tetra oxide.
Question : 3
Soaps are sodium salts of fatty acids. Which of the following fatty acid does not form soap?
a) Palmitic acid
b) Oleic acid
c) Butyric acid
d) Stearic acid
Answer »Answer: (c)
Question : 4
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 : 5
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 : 6
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.
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