Maharashtra Board Class 8 Man Made Materials MCQ

Multiple Choice Questions (MCQs) with Answers on Maharashtra Board Class 8 Man Made Materials mcq

 

What is the primary characteristic of plastics that distinguishes them from natural materials?

1. A) Rigidity
2. B) Plasticity
3. C) Transparency
4. D) Conductivity

    Answer: B) Plasticity

 

Which type of plastic can be molded into different shapes upon heating and retains its original form upon cooling?

1. A) Thermoplastic
2. B) Thermosetting plastic
3. C) Polyethylene
4. D) Polyvinyl chloride

    Answer: A) Thermoplastic

 

Which property makes plastic a bad conductor of heat and electricity?

1. A) Transparency
2. B) Plasticity
3. C) Light Weight
4. D) Insulating

    Answer: D) Insulating

 

 

What is the environmental impact of excessive use of thermocol?

1. A) Increased biodegradability
2. B) Reduced pollution
3. C) Release of poisonous gases
4. D) Enhanced soil fertility

    Answer: C) Release of poisonous gases

 

Which type of glass is commonly used in the pharmaceutical industry due to its inertness to medicines?

1. A) Silica glass
2. B) Borosilicate glass
3. C) Alkali silicate glass
4. D) Lead glass

    Answer: B) Borosilicate glass

 

What is the temperature range at which silica melts during the production of soda-lime glass?

1. A) 100 ºC
2. B) 850 ºC
3. C) 1500 ºC
4. D) 1700 ºC

    Answer: D) 1700 ºC

 

Which type of glass is known for its use in the manufacturing of spectacles, lenses, and microscopic lenses?

1. A) Optical glass
2. B) Coloured glass
3. C) Processed glass
4. D) Silica glass

    Answer: A) Optical glass

 

What type of plastic is used for making electric switches, radio cabinets, and covers over the handles of cookers?

1. A) Polyvinyl chloride (PVC)
2. B) Polystyrene (PS)
3. C) Polyethylene (PE)
4. D) Bakelite

    Answer: D) Bakelite

 

 

Which plastic category includes items like milk bags, packing bags, flexible garden pipes, etc.?

1. A) Polyvinyl chloride (PVC)
2. B) Polyethylene (PE)
3. C) Polypropylene (PP)
4. D) Polystyrene (PS)

    Answer: B) Polyethylene (PE)

 

What is the distinguishing feature of thermosetting plastics?

1. A) They can be molded as per our wish.
2. B) Once molded, their shape cannot be changed on heating.
3. C) They are transparent.
4. D) They decompose easily.

    Answer: B) Once molded, their shape cannot be changed on heating.

 

Why is glass used as an insulator in electric appliances?

1. A) It is a good conductor of electricity.
2. B) It is transparent.
3. C) It is a bad conductor of electricity.
4. D) It is lightweight.

    Answer: C) It is a bad conductor of electricity.

 

What is the adverse health effect associated with prolonged contact with thermocol containing styrene?

1. A) Respiratory issues
2. B) Enhanced vision
3. C) Improved digestion
4. D) Stronger immune system

    Answer: A) Respiratory issues

 

Which type of glass is used in the production of light bulbs and tubes due to its clarity and transparency?

1. A) Silica glass
2. B) Lead glass
3. C) Optical glass
4. D) Borosilicate glass

    Answer: B) Lead glass

 

What is the characteristic property of thermocol that makes it suitable for packing delicate items?

1. A) High density
2. B) Low melting point
3. C) Good conductor of heat
4. D) Shock-absorbing

    Answer: D) Shock-absorbing

 

Which plastic type is commonly used in making raincoats, pipes, handbags, shoes, and electric cable insulation?

1. A) Polyvinyl chloride (PVC)
2. B) Polypropylene (PP)
3. C) Polystyrene (PS)
4. D) Polyethylene (PE)

    Answer: A) Polyvinyl chloride (PVC)