Polypropylene is preferred to polythene, because the former is (A) Non-inflammable (B) Harder (C) Stronger (D) Both (B) & (C)

Polypropylene is preferred to polythene, because the former is
(A) Non-inflammable
(B) Harder
(C) Stronger
(D) Both (B) & (C)
by

1 Answer

Answer :

(D) Both (B) & (C
by

Related questions

Polypropylene compared to polythene is (A) Harder (B) Stronger (C) Lighter (D) All (A), (B) and (C)

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Last Answer : (D) All (A), (B) and (C)

Hot drink (e.g., tea) cups are usually made of (A) Polystyrene (B) Polythene (C) Polypropylene (D) PVC

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Vinyl flooring is done using __________ sheets. (A) Polypropylene (B) PVC (C) Polythene (D) Polyvinyl acetate

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Liners of bags are usually made of (A) Polythene (B) PVC (C) Polypropylene (D) Polyesters

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Last Answer : (C) Polypropylene

Low density polythene as compared to high density polythene is (A) Harder (B) Tougher (C) Chemically inert (D) More flexible

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. Lap joints are preferred over butt joints in soldering/brazing, because these joints are (A) Weaker in tension but stronger in shear (B) Weaker in shear but stronger in tension (C) Stronger in both shear and tension (D) The lap joints are easily made

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Last Answer : r: Option D

A coal with high ash content (A) Has higher calorific value (B) Is harder and stronger(C) Is not subjected to washing(D) Has low quantity of mineral matter

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Neoprene is rendered non-inflammable, because of (A) Its cross-linked structure (B) Its linear chain structure (C) The presence of chlorine atoms in its monomer (D) The absence of chlorine atoms in its monomer

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Last Answer : (C) The presence of chlorine atoms in its monomer

Diphenylamine is added to rubber to (A) Vulcanise it (B) Protect it from deterioration on exposure to air (C) Make it non-inflammable (D) Make it thermosetting

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The lightest non-inflammable gas is (A) H2 (B) He (C) Ar (D) O2

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Last Answer : Option B

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Which word(s) could be eliminated for a stronger effect Please give my regards to each and every one of my former students?

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The lightest, non-inflammable gas is

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Last Answer : Ans: d

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Last Answer : Ans: c

Why is Neoprene rubber non –inflammable ?

Description : Why is Neoprene rubber non –inflammable ?

Last Answer : A. Due to presence of chloro group . 

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The insulating material for cables should (a) be acid proof (b) be non-inflammable (c) be non-hygroscopic (d) have all above properties

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Hydrogen is not found in atmosphere because – (1) it is highly inflammable (2) it is the lightest gas (3) it is absorbed by plants (4) it immediately combines with oxygen to form water

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Hydrogen is not found in atmosphere because (1) it is highly inflammable (2) it is the lightest gas (3) it is absorbed by plants (4) it immediately combines with oxygen to form water

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Last Answer :  it is the lightest gas

Sometimes, batch process is preferred over continuous process, when the product (A) Quality & yield cannot be achieved in continuous processes, because of long residence time (B) Sales demand is fluctuating (C) Both (A) & (B) (D) Neither (A) nor (B)

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Last Answer : (C) Both (A) & (B)

Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint. (A) Black (B) White (C) Red (D) Yellow

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Last Answer : (B) White

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'Flare tower' used in industry is meant for (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure (B) Absorbing the pollutant gases from the furnace exhaust (C) Cooling of furnace exhaust gases (D) None of these

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Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester

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Commercial production of polypropylene employs __________ polymerisation. (A) Emulsion (B) Suspension (C) Solution (D) Bulk

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Which of the following is a copolymer? (A) Polystyrene (B) SBR (C) PTFE (D) Polypropylene

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Last Answer : (B) SBR

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__________ is a copolymer. (A) Nylon-66 (B) Polypropylene (C) PVC

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Which of the following is not a polyolefin? (A) Polystyrene (B) Polypropylene (C) Neoprene (D) None of these

Description : Which of the following is not a polyolefin? (A) Polystyrene (B) Polypropylene (C) Neoprene (D) None of these

Last Answer : (C) Neoprene

Contact lenses for eyes are made of Perspex, which is nothing but (A) poly-methyl-methacrylate (B) Polystyrene (C) Unsaturated polyester (D) Polypropylene

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Last Answer : (A) poly-methyl-methacrylate

Flexible plastic pipes are made of (A) High density polyethylene (HDPE) (B) Low density polyethylene (LDPE) (C) Polypropylene (D) Unsaturated polyester

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Last Answer : (B) Low density polyethylene (LDPE)

Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon

Description : Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon

Last Answer : (B) Cellulose derivatives, Polyisoprene, Polyethylene

The most commonly used resin for making reinforced plastic is (A) Unsaturated polyester (B) Polypropylene

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Last Answer : (A) Unsaturated polyester

Insulation of liquid surface can be achieved by __________ on top of its surface. (A) Floating hollow polypropylene spheres (B) Spraying alumina powder (C) Putting cement (D) None of these

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Last Answer : (A) Floating hollow polypropylene spheres

Which of the following are condensation polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) Both II and III

Description : Which of the following are condensation polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) Both II and III

Last Answer : Only III

Which of the following are addition polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) both I and II

Description : Which of the following are addition polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) both I and II

Last Answer : both I and II

Pick out the wrong statement. (A) Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure (B) Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure (C) Tungsten has a body centred cubic (bcc) crystal lattice structure (D) Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

Description : Pick out the wrong statement. (A) Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure (B) Metal/alloys having body centred cubic ... D) Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

Last Answer : (C) Tungsten has a body centred cubic (bcc) crystal lattice structure

Pick out the wrong statement. (A) Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse (B) Packed towers are preferred over plate towers for handling corrosive and foamy liquids (C) Diameter of randomly packed tower is normally more than 1.2 metres (D) Due to uneven supply and improper distribution of liquid, problem of channelling, loading & flooding is generally encountered in packed towers

Description : Pick out the wrong statement. (A) Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the ... of liquid, problem of channelling, loading & flooding is generally encountered in packed towers

Last Answer : (C) Diameter of randomly packed tower is normally more than 1.2 metres

Batch process is preferred over continuous process, when the (A) Product yields and quality cannot be achieved in continuous process, because of long residence time (B) Sales demand of product is not steady (C) Same equipment cannot be used for several processes of the same nature (D) All (A), (B) & (C)

Description : Batch process is preferred over continuous process, when the (A) Product yields and quality cannot be achieved in continuous process, because of long residence time (B) Sales demand of product is not steady (C) Same ... be used for several processes of the same nature (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Batch process is preferred over continuous process, when the (A) Product yields and quality cannot be achieved in continuous process, because of long residence time (B) Sales demand of product is not steady (C) Same equipment cannot be used for several processes of the same nature (D) All (A), (B) & (C)

Description : Batch process is preferred over continuous process, when the (A) Product yields and quality cannot be achieved in continuous process, because of long residence time (B) Sales demand of product is not steady (C) Same ... cannot be used for several processes of the same nature (D) All (A), (B) & (C)

Last Answer : (B) Sales demand of product is not steady

Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by water (3) The heat required for combustion of petrol is very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than ... while petrol stays afloat and keeps burning. Petrochemical fires are nearly always extinguished with chemical foam.

Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by water (3) The heat required for combustion of petrol is very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than petrol as a ... extinguished with chemical foam which forms a blanket over the flames and cuts off the oxygen supply.

Carbon monoxide is an inflammable gas. Which one of the following is also inflammable? (1) Helium (2) Nitrogen (3) Oxygen (4) Hydrogen

Description : Carbon monoxide is an inflammable gas. Which one of the following is also inflammable? (1) Helium (2) Nitrogen (3) Oxygen (4) Hydrogen

Last Answer : (4) Hydrogen Explanation: At standard temperature and pressure, hydrogen is a colourless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic has with the molecular ... important role in acid-base chemistry with many reactions exchanging protons between soluble molecules.

Bromine is- (1) Colorless gas insoluble in water (2) A highly inflammable gas (3) A Black solid (4) A red liquid

Description : Bromine is- (1) Colorless gas insoluble in water (2) A highly inflammable gas (3) A Black solid (4) A red liquid

Last Answer : (4) A red liquid Explanation: Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming liquid with a deep red color. At room temperature, Bromine evaporates readily to form a red to amber colored gas.