matter in our surrounding

what is the SI unit of density

• pascal

• kg/m³

• newton

• m³

the amount of heat needed to convert the unit mass of solid into the liquid without the change in temperature is called

• latent heat of fusion

• latent heat of vapourization

• boiling point

• none of the above

covert 300 K temperature to Celsius scale

• 373* C

• 27^*C

• 573* C

• None of the above

On heating substance the kinetic energy of its particle

• remains constant

• first decreases then become constant

• increases

• none of these

When a solid on being heated directly changes to gas without getting converted into a liquid first, this is called

• rusting

• sublimation

• rancidity

• condensation

Which of the following is most suitable for summer?

• Cotton

• Nylon

• Polyester

• Silk

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

• Low temperature, low pressure

• High temperature, low pressure

• Low temperature, high pressure

• High temperature, high pressure

The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called _____ .

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.

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.