Even though a cinema hall is a place prone to fire hazards, the interiors are mostly made of wood or wood based panels. Why is this so ?
Wood does not catch fire easily
Wood is opaque
Wood can absorb sound
Wood is very commonly available
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
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
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 material is hard, opaque and shines when freshly cut ?
Rubber
Wood
Tin
Plastic
Equal volumes of different substances
Have equal weights
Have equal densities
Need not have equal weights
None
Door locks are made of metals because metals:
Have luster
Are opaque
Are good conductors of heat
Are hard and strong
Most balloons, tyres and footballs are made of rubber. This is because rubber is:
Naturally available
Cheap
An electrical insulator
Soft and flexible
Of our total body weight, about two thirds is made up of water and it is important to have a regular intake of water. This is because
Water has lots of vitamins and proteins
Water can dissolve a lot of substances
Water conducts heat very fast and there by maintains the body temperature
Water is stored as energy in our body
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
