Class IX

Anemometer measures
  1. Amount of haemoglobin in blood
  2. Pollination of plant by the wind
  3. Wind resistance
  4. Wind speed.
Which of the following is NOT true about colloids ?
  1. Particles in a colloid can pass through filter paper
  2. A colloid is a homogeneous solution
  3. Colloidal particles exhibit Brownian motion
  4. Colloidal particles exhibit electrophoresis.
Diamond is lustrous because
  1. it is colourless
  2. it is hard
  3. it is pure
  4. its refractive index is high
How can we separate cream from milk ?
  1. Centrifugation
  2. Chromatography
  3. Sublimation
  4. Distillation
The particles of a suspension will be of size ________
  1. than 1nm (nm = nano metre)
  2. between 1nm to 100 nm
  3. greater than 100nm
  4. less than 0.1 nm
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