Class VII

Change in speed of light when entering water is
  1. 5,000 km/s
  2. 50,000 km/s
  3. 100,000 km/s
  4. 200,000 km/s
Night blindness is caused due to
  1. lack of rods
  2. over numbering of cones
  3. problem in cones
  4. problem in rods
. When red and blue are combined together, they form
  1. yellow
  2. magenta
  3. orange
  4. purple
Screens of monitors and televisions are made by
  1. red dots
  2. red, yellow and green dots
  3. red, green and blue dots
  4. white dots
Index that identifies each object is known as
  1. Index that identifies each object is known as
  2. refractive index
  3. reflective index
  4. bending index
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