MATTER IN OUR SURROUNDINGS

Seema took a 100 ml beaker and filled half the beaker with water and marked the level of water. She dissolved some salt with the help of a glass rod and recorded water level again.

• The water level increases appreciably

• The water level decreases

• The water level remains the same

• There is little increase in water level.

Which of the following is not a characteristic of matter?

• Matter is made up of extremely small particles

• There is no space between particles of matter

• The particles of matter are continuously moving

• The particles of matter attract each other.

During summer, water kept in earthen pot becomes cool due to phenomenon of

• Diffusion

• Transpiration

• Distillation

• Evaporation

Which of the following is correct order of forces of attraction?

• Water > Air > Sand

• Air > Sugar > Oil

• Air < Water < Sugar

• Salt > Air > Juice

If we keep cold drink bottle in freezer, what will happen?

• Water will change into ice

• Cold drink bottle will break

• CO₂ gas will get solidified

• Nothing happens.

Choose the correct statement out of the following

• Conversion of solid into vapours without becoming liquid is called evaporation.

• Conversion of vapours into solid without becoming liquid is called sublimation

• Conversion of solid into liquid is called sublimation.

• Conversion of liquid into vapours is called fusion.

Which of the following conditions will increase the rate of evaporation?

• Increase in temperature of water

• Decrease in wind speed

• Decrease in surface area of water

• Adding sugar to water

Which of the following is incorrect?

• Solids have fixed shape and fixed volume.

• Liquids have fixed volume but not shape

• Gases have neither fixed shape nor volume

• The particles have least intermolecular space but maximum kinetic energy in liquids.

Ice floats on water because

• it has higher density than water

• it has lower density than water due to more volume

• it is solid

• it is low melting solid

The physical state of a matter depends upon

• temperature and pressure

• temperature only

• pressure only

• nature of substance