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Published on: 18/10/2019
Chemistry in Everyday Life
Download Tamil Nadu 6th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
_____________ is a soft white or grey, naturally available mineral.
Gypsum
Chemical change
Physical change
Chemistry
2.
In _________________ only the shape, size or volume changes.
Natural indicator
Chemical change
Physical change
Chemistry
3.
_______________ results in the change of the substance;
Natural indicator
Chemical change
Physical change
Chemistry
4.
Natural adhesives are made from ________.
Protein
fat
starch
vitamins
5.
Soaps were originally made from___________ .
proteins
animal fats and vegetable oils
chemicals extracted from the soil
foam booster
6.
___________ are the three important nutrients among the various nutrients needed for the growth of plants.
7.
_________________ are organic or inorganic materials that we add to the soil to provide one or more nutrients to the soil.
8.
In 1824, _____________ invented Portland cement by burning finely ground chalk and clay in a kiln.
9.
_________ is an example for natural adhesive.
10.
____________ is called as farmer’s best friend.
11.
NPK are the primary nutrients for plants.
12.
Plaster of Paris is obtained from heating gypsum.
13.
Concentrated phenol is used as a disinfectant.
14.
gypsum
15.
Water
16.
Phenol
17.
Gypsum
18.
Soap
19.
What is meant by chemistry?
20.
What are the ingredients of the cement?
21.
Mention any three physical properties of phenol.
22.
What are the three main constituents of soap?
23.
Name some artificial adhesive.
24.
What are uses of Gypsum?
25.
Explain the process of manufacturing cement.
26.
Why earthworm is called as farmer’s friend?
27.
Differentiate organic and inorganic fertilizers.
28.
How are detergents manufactured?
29.
Cement becomes softer when it is mixed with water.
30.
Phenol irritates when exposed on human skin.
1.
(a)
Gypsum
2.
(c)
Physical change
3.
(b)
Chemical change
4.
(c)
starch
5.
(b)
animal fats and vegetable oils
6.
( )
Nitrogen (N), Phosphorous (P) and Potassium (K)
7.
( )
Fertilizers
8.
( )
Joseph Aspdin
9.
( )
Starch
10.
( )
Earthworm
11.
True
12.
True
13.
Low concentrated phenol is used as a disinfectant.
14.
CaSO4. 2H2O
15.
H2O
16.
C6H5 OH
17.
CaSO4.2H2O
18.
NaOH
19.
Chemistry is the branch of science which deals with the study of particles around us. The beauty of chemistry is that, it explains the properties of the basic components of particles such as atoms and molecules and the effects of their combination.
20.
Lime, clay and Gypsum are the ingredients of cement
21.
i) It is a weak acid.
ii) It is a volatile white crystalline powder.
iii) It is colourless. But changes to red in the presence of dust.
22.
water, Sodium hydroxide and coconut oil.
23.
Artificial adhesives may be classified in a variety of ways depending on their utilities. Their forms are paste, liquid, film, pellets, tape.
24.
i) Used as fertilizers.
ii) Used in the process of making cement.
iii) In the process of making Plaster of Paris.
25.
Cement is manufactured by crushing of naturally occurring minerals such as lime, clay and gypsum.
26.
(i) Earthworms take organic wastes as food and produce compost castings.
(ii) They improve the soil health and consequently plant health.
(iii) Because of the multitude of services, Earthworms are known as Farmer's friend.
27.
| Organic fertilizer | Inorganic fertilizer |
| Fertilizers containing only plant or animal-based materials or those synthesized by micro-organisms are called 'organic fertilizers. These fertilizers can be prepared easily. This type of fertilizers are economical. (e.g) Vermi compost, compost. |
The fertilizers prepared by using natural elements by making them undergo chemical changes in the factories are called inorganic fertilizers. (e.g) Urea, Ammonium sulphate and Super phosphate. |
28.
Aim: Soap manufacturing.
Requirements:
i) 35 ml of water.
ii) 10 ml of NaOH.
iii) 60 ml of coconut oil.
Procedure:
i) Cover your work area with old newspaper.
ii) Take 35 ml of water in a jar.
iii) Add 10 gram of concentrated NaOH and allow it to cool.
iv) Then add 60 ml of coconut oil drop by drop and stir it well.
v) On getting dried, soap can be obtained.
29.
(b)
30.
(a)
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