Which of the following is not a natural polymer?

• (a) Wool
• (b) Silk
• (c) Cotton
• (d) Teflon

A polymer which is used for making ropes and carpet fibers is:

• (a) Polyacetylene
• (b) Polypropylene
• (c) Polyacrylonitrile
• (d) PVC

The urine sample of a diabetic patients contains:

• (a) Sucrose
• (b) Fructose
• (c) Glucose
• (d) All of the above

The quality of diesel oil for use in diesel engines is determined by:

• (a) The composition of the oil
• (b) The octane number
• (c) The cetane number
• (d) The amount of additive added

Rusting of iron is:

• (a) An electrochemical process
• (b) A photochemical process
• (c) An electro analytical process
• (d) All of the above

When mild steel is heated to a high temperature and suddenly cooled in water, it becomes hard and brittle. The process is called:

• (a) Hardening
• (b) Annealing
• (c) Quenching
• (d) Tempering

Which of the following is used as moderators in nuclear reactors?

• (a) Graphite
• (b) Paraffin
• (c) Heavy water
• (d) All of the above

Silicon carbide (SiC) is known as:

• (a) Quartz
• (b) Tridynite
• (c) Corundum
• (d) Carborundum

A pale blue gas with a fish-like odour restores the color of a blackened lead painting. The gas is also used as rocket fuel. It is:

• (a) Oxygen
• (b) Ammonia
• (c) Sulphur dioxide
• (d) None of these

The bleaching action of chlorine occurs in the presence of:

• (a) Moisture
• (b) Sunlight
• (c) Pure oxygen
• (d) Pure sulphur dioxide

Haem is the important biologically in the myoglobin which is used to store:

• (a) Nitrogen in muscles
• (b) Chlorine in muscles
• (c) Oxygen in muscles
• (d) Carbon dioxide in muscles