Matter in our surroundings

Which of the following phenomena always results in the cooling effect?

• condensation

• sublimation

• crystallisation

• evaporation

Which of the following cannot be considered a form of matter?

• atom

• water

• cold

• electron

Which of the following statement is correct?

• Materials existing as liquids at room temperature have their melting and boiling points lower than that of room temperature.

• The phenomenon involving the transition of a substance from solid to liquid state is called sublimation.

• To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given temperature

• The density of ice is less than that of water.

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vapourisation

• Rises very slowly

• Rises rapidly until steam is produced

• First rises and then becomes constant

• Does not rise at all

When water at 0°C freezes to form ice at the same temperature of 0°C, then it

• Absorbs some heat

• Releases some heat

• Neither absorbs nor releases heat

• Absorbs exactly 3.34 x 10⁵J/kg of heat

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

On which factors evaporation does not depend

• Humidity

• Temperature

• Surface area

• Quality of matter

when 2-3 crystals of potassium permanganate are dissolved in water, the colour of water will be

• blue

• green

• yellow

• purple pink

The fifth state of matter is given by?

• Subhash Chandra Bose

• Albert Einstein

• Satyendra Nath Bose

• Both Satyendra Bose and Einstein