Tag: chemistry

Questions Related to chemistry

Distilled water is clean and pure water, but unfit for human consumption.

chemistry water too little to waste effects and conservation of water pollution water pollution, its effects and cures for a pollution free nature

  1. True

  2. False

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Correct Option: A
Explanation:

Drinking distilled water robs your body of its natural source for many minerals essential to good health. This results in a mineral loss in the body with increase your risk for osteoporosis, hypertension, osteoarthritis etc.

500 ml of a sample COD of water required 19.6 mg of $ K _2Cr _2O _7 $ of water sample is

chemistry water too little to waste effects and conservation of water pollution water pollution, its effects and cures for a pollution free nature

  1. 9 PPM

  2. 8PPM

  3. 16.8 PPM

  4. 10 PPM

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Correct Option: B

Identify the material by which computers are made up of:

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. fibre

  2. plastic

  3. zinc

  4. all of above

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Correct Option: B
Explanation:

Computers are made of plastics. Plastics like thermosetting which remain permanently hard after being formed and cooled are used in constructing the body.

Select the group of objects which can be formed by wood.

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Chair, sofa, car

  2. Computer, mobile, pen-holder

  3. Books, bookshelf, table

  4. Bullock cart, door, boat

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Correct Option: D
Explanation:

A bullock cart, door and boat all can be formed by wood. A bullock cart is used to transport goods from one place to another in villages is made of wood only. Doors can be made of wood, glass or metals and small boats are also made of wood preferentially. 


Hence, option $D$ is correct.

Identify the material of cloths.

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Fibre

  2. Plastic

  3. Iron

  4. All of these

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Correct Option: A
Explanation:

Clothes are made of Fibres.

Fibers can be obtained from different sources such as from plants, animals, insects, chemicals, etc.
Examples of Plant fiber- Cotton, jute, flax, cantala, etc.
Examples of Animal fibre- Wool, alpaca fiber, silk, etc.

Which of the following objects are correctly matched with its material?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Quilt, bed-sheet, cloth - cotton

  2. Utensils, frames, furniture - wood

  3. Crockery, vase, decorative articles - clay

  4. Jewellery, ornaments, jewellery box - gems

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Correct Option: A
Explanation:

Quilt, bedsheet and clothes all are made from cotton. Utensils, frames and furniture are made from metals. Crockery, vase and decorative articles are made from glass and jewellery, ornaments and jewellery box are made of metals as gold or silver in which gems are used to decorate them.

Which of the following object(s) which can be made from wood?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. Automobile

  2. Chair

  3. Bullock cart

  4. Table

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Correct Option: B,C,D
Explanation:

Among these the objects which can be made fro wood are-

$Chair, Bullock-cart, Table$.

Cart, wheels and plough these materials are made up of :

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. wood

  2. plastic

  3. metal

  4. None of these

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Correct Option: A
Explanation:

Cart (Bullock-cart), wheels and plough are made of wood.


Carts are the vehicles designed for transportation of goods to small distances; using two wheels which are also made of wood and normally pulled by one or a pair of animals, or handcarts are also there which are pulled or pushed by humans.


Wheels can be made of wood as well as metals.

Plough which is used in farming to dig soil is also made of wood, nowadays its made up of metal. 


Hence the option A is correct.

Computer is made up of:

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. plastic

  2. metal

  3. wood

  4. silk

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Correct Option: A,B
Explanation:

Few parts of the computer are made of plastics and few from metal.

The outer covering of the body is plastic;
keyboard, mouse all are made of plastic. The CPU & inner parts are made with metal-containing various chips.

Which of the following material(s) is/are used to make plate (thali)?

chemistry nature of things objects around us different types of materials materials around us and importance of grouping

  1. steel

  2. glass

  3. plastics

  4. All of the above

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Correct Option: D
Explanation:

Plates that are used frequently are made of steel or glass whereas disposable plates are made of plastics. Hence answer is option D.