Tag: changes around us

Questions Related to changes around us

Angora wool is obtained from____________.

biology substances in daily use can all changes be reversed? substances and objects changes around us

  1. Worm

  2. Yak

  3. Goat

  4. Sheep

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Correct Option: C
Explanation:
Angora wool is obtained from Goat. 
The fleece taken from an Angora Goat is called Mohair. A goat produces four to five kg of hair per year.

Which of the following fiber was first developed in the China?

biology substances in daily use can all changes be reversed? substances and objects changes around us

  1. Wool

  2. Silk

  3. Cotton

  4. None of the above

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Correct Option: B

The most fibre are chemically composed of non-starch polysaccharides.

biology substances in daily use can all changes be reversed? substances and objects changes around us

  1. True

  2. False

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Correct Option: A
Explanation:

The most fibre are chemically composed of non-starch polysaccharides like cellulose, inulin, lignin, chitins, pectins, oligosaccharides. They are either obtained from plants or animals. They are either soluble or insoluble. 

Which of the following is called as queen of fibers?

biology substances in daily use can all changes be reversed? substances and objects changes around us

  1. Angora wool

  2. Pashmina

  3. Silk

  4. Nylon

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Correct Option: C
Explanation:
Silk is called a queen of fibers. Because it is of good quality and it thus makes it expensive too.

Human life require which kind of material for leaving?

evs substances in daily use can all changes be reversed? substances and objects changes around us

  1. Food

  2. Fuel

  3. Home

  4. All of these

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Correct Option: D
Explanation:
Food is something that provides nutrients. 

Nutrients are substances that provide: energy for activity, growth, and all functions of the body such as breathing, digesting food, and keeping warm; materials for the growth and repair of the body, and for keeping the immune system healthy.

Fossil fuels are used to fuel cars and aeroplanes, power electricity plants, and heat our homes. 

They are also used to make medicines, cosmetics, plastics, synthetic fabrics, and lubricants. When you brushed your teeth today, you used a product made from oil – toothpaste.

We need a home as it gives shelter and security.

Hence the option D is correct.

Coal is _________ fuel.

evs substances in daily use can all changes be reversed? substances and objects changes around us

  1. fossil

  2. natural

  3. Both a and b

  4. None of these

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Correct Option: A
Explanation:

Coal is a fossil fuel. Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. 

Petroleum products are used for :

evs substances in daily use can all changes be reversed? substances and objects changes around us

  1. fuel purpose

  2. making creams and ointments

  3. both $A$ and $B$

  4. None of these

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Correct Option: C
Explanation:

Petroleum products such as petrol, diesel, kerosene and petroleum gas are used as fuel as they have high calorific value. 


Petroleum products are also used as raw material for cosmetics industries.

Hence the option C is correct.

The fuel used in homes for making food is :

evs substances in daily use can all changes be reversed? substances and objects changes around us

  1. CNG

  2. LPG

  3. KPG

  4. HDG

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Correct Option: B
Explanation:

B, LPG is clean fuel, it has high calorific value and low ignition temperature.

It is easy to handle and to transport. All these qualities make it suitable for domestic use.

Which of the following changes are irreversible?

chemistry changes around us can all changes be reversed? substances and objects classification of changes

  1. Raw egg to boiled egg

  2. Woollen yarn to knitted sweater

  3. Bud to flower

  4. All of the above

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Correct Option: D
Explanation:

The following changes are irreversible.We cant covert product into reactant in these processes

1) Raw egg to boiled egg.
2) Woollen yarn to the knitted sweater.
3) Bud to flower.

Which of the following represents a reversible change?

chemistry changes around us can all changes be reversed? substances and objects classification of changes

  1. A metal rod on heating expands (its length increases).

  2. A metal rod on cooling contracts (its length decreases).

  3. Both of the above

  4. None of the above

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Correct Option: C
Explanation:

The following represents a reversible change. A metal rod on heating expands (its length increases). A metal rod on cooling contracts (its length decreases).