Matter in Our Surroundings

Evaporation of a liquid at room temperature leads to a _____ effect.

• Heating

• Windy

• Cooling

• None of the above

What is the SI unit of density?

• kg/m³

• g/cm³

• g/ml

• g/L

What process causes shrinking of grapes kept in sugar syrup?

• diffusion

• evaporation

• effusion

• osmosis

What is the unit of latent heat of fusion?

What is the unit of pressure?

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.

A few substances are arranged in the increasing order of 'forces of attraction'between their particles.Which one of the following represents a correct arrangement?

• Water,air,wind

• Air,sugar,oil

• Oxygen,water,sugar

• Sugar,juice,air

Which of the following has minimum kinetic energy ?

• Particles of ice below 0 °C

• Particles of water at 0 °C

• Particles of water at 100 °C

• Particles of steam at 100 °C

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.

During summer, water kept in an earthen pot becomes cool because of the phenomenon of:

• diffusion

• transpiration

• osmosis

• evaporation