Tag: chemistry

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

Which of the following best describes biodegradation?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Milk pouches

  2. Edible oil container

  3. Ice-cream packs

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Plastic is bad for environment because :

  1. they are non-biodegradable

  2. they harm aquatic life

  3. they are toxin carrier

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Incineration of plastics causes:

  1. nitrogen emission

  2. sulfur emission

  3. carbon emission

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

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 -

  1. 50 to 70 m

  2. 50 to 80 m

  3. 50 to 60 m

  4. 50 to 90 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In standard sewerage design, manholes are typically placed at intervals of 50 to 60 meters to allow for maintenance and inspection.

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

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

  1. Sewage treatment plant

  2. Incineration

  3. Dumping

  4. Recycling
Reveal answer Fill a bubble to check yourself
B Correct answer
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