51.

Which of the following is a natural polymer?

• Baketlite

• Nylon

• Polythene

• Polythene

Which one of the following non-metals shows allotropy in the liquid state?

• Carbon

• Sulphur

• Phosphorous

• Phosphorous

The absolute zero is a temperature at which .........

• molecular motion in a gas would cease

• water freezes

• all gases become liquid

• all gases become liquid

Nylon threads are made of

• Polyester polymer

• Polyamide polymer

• Polyvinyl polymer

• Polyvinyl polymer

Chemical composition of cement is

• Limestone and Clay

• Limestone, Clay and Gypsum

• Limestone and Gypsum

• Limestone and Gypsum

Bee stings contains .............

• an acidic liquid

• a salt solution

• an alkaline liquid

• an alkaline liquid

Potassium Permanganate is used for purifying drinking water, because

• It is a reducing agent

• It is an oxidizing agent

• It is a sterilizing agent

• It is a sterilizing agent

Atoms of same element having different mass numbers are called

• Isobars

• Isotopes

• Isotones

• Isotones

Trinitrotoluene is

• used to melt metals

• used to fuse two metals

• used as an abrasive

• used as an abrasive

Which is the heaviest among the following?

• Gold

• Silver

• Iron

• Iron