1 kg of iron occupies less space compared to 1 kg of sponge. Why ?
Iron has less density than sponge
Iron and sponge have equal densities
Iron has more density than sponge
None
A mirror is
Opaque
Transparent
Tanslucent
Clinical thermometers are made up of glass. The important characteristic(s) considered for this selection is/are:
It is a bad conductor of heat
It is transparent
Both A and B
It is strong
Which of the following is suitable to make rain coats?
Cotton
Plastic
Silk
Door locks are made of metals because metals:
Have luster
Are opaque
Are good conductors of heat
Are hard and strong
By dropping a drop of water on a glowing electric blub, it bursts. This is because glass is a:
Good conductor of heat
Bad conductor of heat
Transparent substance
Good conductor of electricity
A needle and a knife belong to the same group because:
They are transparent
They are hard and magnetic
They float on water
They are poor conductors of heat
Which of the following material is hard, opaque and shines when freshly cut ?
Rubber
Wood
Tin
Most balloons, tyres and footballs are made of rubber. This is because rubber is:
Naturally available
Cheap
An electrical insulator
Soft and flexible
Paper bags are preferred over plastic ones because
Plastic bags are light
Paper bags are stronger
Plastic bags are not biodegradable
Paper bags are not biodegradable
