Class X

Focal length of plane mirror is
  1. At infinity
  2. Zero
  3. Negative
  4. None of these
The optical phenomena, twinkling of stars, is due to
  1. Atmospheric reflection
  2. Total reflection
  3. Atmospheric refraction
  4. Total refraction
How does common salt help in separating soap from the solution after saponification?
  1. By decreasing solubility of soap
  2. By increasing solubility of soap
  3. By decreasing density of soap
  4. By increasing density of soap
The radius of curvature of a mirror is 20cm the focal length is
  1. 20cm
  2. 10cm
  3. 40cm
  4. 5cm
Epoxy resins are used as
  1. moth repellants
  2. insecticides
  3. detergents
  4. adhesives
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