Class X

A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
  1. At infinity
  2. Between F and C
  3. Between P and F
  4. At E
Your image in a bathroom mirror results from __________.
  1. Diffuse reflection
  2. Specular refraction
  3. Specular reflection
  4. Diffuse refraction
Focal length of plane mirror is
  1. At infinity
  2. Zero
  3. Negative
  4. None of these
In the manufacture of safety matches, which of the following materials are used to coat the two sides of match boxes? 1. Yellow phosphorus 2. Glue 3, Glass powder 4. Red phosphorus
  1. l, 2 and 3
  2. l,3 and 4
  3. l,2 and 4
  4. 2,3and4
Catalytic properties of a substance may be best defined as a phenomenon of ?
  1. Absorption
  2. Chemisorption
  3. Adsorption
  4. None of these
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