Matters in our surroundings

Evaporation is inversely proportional to

• Humidity

• Surface area

• Temperature

Rahul was sleeping for a long time .his brother filled a balloon with air and pricked it near his head to wake him up ..what will happen to the air in balloon .

Which of the following are a better conductor of electricity than copper.

• Mica

• Plasma

• Teflon

• Brass

Density of a substance is defined as

• ratio of mass and temperature

• product of mass and volume

• ratio of mass and volume

• product of mass and temperature

Which of the following is most suitable for summer?

• Cotton

• Nylon

• Polyester

• Silk

what is matter

• anything which has mass

• anything which occupies space

• both a and b

• none of these

which causes severe burns

• cold water

• steam

• warm water

• boiling water

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

• Air is heavier than bromine

• Both air and bromine have the same density

• Bromine is heavier than air

• Bromine cannot be heavier than air because it is going upwards against gravity

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

• (i) and (iii)

• (i) and (ii)

• (i) and (iv)

• (ii) and (iii)

Which of the following is not a property of matter?

• Matter is made up of extremely small particles

• There is space between particles of matter

• The particles of matter are in stationery state

• The particles of matter attract each other.