Tag: chemistry

Questions Related to chemistry

Use of plastic bags and cans for packing food items is harmful to health.

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. True

  2. False

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Correct Option: A

What is biodegradable?

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. Something that grows up

  2. Natural decomposition by bacteria

  3. Food for animals

  4. Something that can melt

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Correct Option: B

Which of the following best describes biodegradation?

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. A minor change in an organic molecule

  2. Fragmentation of a complex organic molecule

  3. Complete transformation of the organic molecule to mineral forms

  4. All of the above

  5. None of the above

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Correct Option: D
Explanation:

A biodegradable substance is the one which gets decomposed by the natural processes. It can be also described by a the minor change in the organic molecule, fragmentation or we can say breaking of the complex molecule or the complete transformation of the organic molecule to the mineral form.

Which of the followings prove that plastics do not make food and medicine toxic?

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. Milk pouches

  2. Edible oil container

  3. Ice-cream packs

  4. All of these

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Correct Option: D
Explanation:

Plastics are not toxic when come in contact with food and medicines if they are synthesized according to permissible standards. Plastics are used world-over because they are safe for packaging of foods, medicines and child care products. A few examples are - milk pouches, edible oil container, ice-cream packs, blister packs for tablets and capsules. I.V. fluids and blood is collected and stored in plastic bags.

Plastic is bad for environment because :

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. they are non-biodegradable

  2. they harm aquatic life

  3. they are toxin carrier

  4. all of these

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Correct Option: D
Explanation:

Plastic poses several environmental risks, including leaching chemicals and toxins into surrounding ecosystems, threatening the health of local animal populations and releasing greenhouse gases into the air. plastic are non-biodegradable. The negative effects of plastic vary depending on the type of plastic in the environment, quantity and length of exposure time. Plastics contain compounds, such as PVC and BPA, elements deemed a health risk to humans and animals while the leaching of these compounds into air and waterways poses a health and safety risk for nearby organisms.

Incineration of plastics causes:

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. nitrogen emission

  2. sulfur emission

  3. carbon emission

  4. all of the above

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Correct Option: C
Explanation:
Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials. The $CO _2$ is produced when plastics are incinerated. The plastics are petroleum oil and gas derived products  and are generally treated as non-renewable.

 Which of the following object is not made from paper?

chemistry man made materials plastic and environment pollution due to plastics environmental impact: plastics

  1. Bullock cart

  2. Book

  3. toys

  4. calenders

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Correct Option: A
Explanation:

Bullock cart is not made from paper. Book, notebooks, newspaper, toys, calenders are made from paper.

Manholes are located at every ................ in the sewerage, at the junction of two or more sewers and at points where there is a change in direction -

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. 50 to 70 m

  2. 50 to 80 m

  3. 50 to 60 m

  4. 50 to 90 m

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Correct Option: C

The activated sludge is about ............ water.

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. 96%

  2. 97%

  3. 94%

  4. 98%

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Correct Option: B
Explanation:

Activated sludge is about $97$% water. Sludge is the waste material produced by humans left during sewage treatment. Activated sludge process is the process of treatment of sewage and industrial waste. 

_____ is used to destroy the household waste,chemical waste and biological waste (from hospitals)  to $CO _2$ and $H _2O$?

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. Sewage treatment plant

  2. Incineration

  3. Dumping

  4. Recycling

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Correct Option: B
Explanation:

Incineration: A high temperature of above 1273K is required to convert the industrial, household and biological waste along with plentiful of oxygen supply into gases. Waste is converted into Carbon-dioxide and water