Class X

Gases are highly compressible due to
  1. Unfixed shape and volume
  2. Collision of particles
  3. High density
  4. Distance of particles
 In condensation, which change of state takes place?
  1. Gas to Solid
  2. Gas to Liquid
  3. Liquid to Gas
  4. Liquid to Solid
 During process of solidification, when liquid is being changed into solid, temperature at that period would
  1. Increase
  2. Decrease
  3. Remain constant
  4. May increase or decrease
 If air at a pressure of 2 MPa is compressed such that new volume of air is one eighth of its initial volume, then new pressure of air is
  1. 0.25 M Pa
  2. 2 M Pa
  3. 8 M Pa
  4. 16 M Pa
If a bulb uses energy of 100 J and remains on for 25 s, power consumed by bulb will be
  1. 125 W
  2. 4 W
  3. 2500 W
  4. 75 W
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