A vendor sells white powdered salt mixed with white powdered stone. The knowledge of which properly will help you detect this malpractice?
Ductility
Opacity
Density
Solubility
Kerosene floats on water because
Kerosene has more density
Kerosene has less energy
Densities of water and kerosene and equal
Water has more density
Which of the following is suitable to make rain coats?
Cotton
Plastic
Silk
None
Opaque objects:
Reflect most of the light falling on them
Transmit most of the light falling on them
Absorb most of the light falling on them
Are strong and hard
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
Most balloons, tyres and footballs are made of rubber. This is because rubber is:
Naturally available
Cheap
An electrical insulator
Soft and flexible
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
Most of the metals:
Are hard
Have luster
Are good conductors of electricity
All of these
Which of the following material is hard, opaque and shines when freshly cut ?
Rubber
Wood
Tin
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