Matter in our sorroundings class 9

The substances which occupy some space and having some mass called

• Particles

• Impure substance

• Ions

• Matter

On which factors evaporation does not depend

• Humidity

• Temperature

• Surface area

• Quality of matter

The process in which solid is directly convert into gas is called

• Condensation

• Boiling

• Evaporation

• None of the above.

On heating, a solid is converted to liquid. This change is called

• Melting

• Fusion

• Diffusion

• Freezing

On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be

• 298 K, 311 K and 339 K

• 298 K, 300 K and 338 K

• 273 K, 278 K and 543 K

• 298 K, 310 K and 338 K

In which state of matter , process of diffusion is fastest?

• Liquids

• Gases

• Solids

• Semi - solids

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

• diffusion

• transpiration

• osmosis

• evaporation

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 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.

Which of the following will produce severe burns ?

• Cold water

• Hot water

• Boiling water

• Steam