N D A Examination Solved Question Paper August 2013

  • Question 9 :
  • Which one among the following about Prof. C.N.R. Rao is not correct?

  • He worked mainly in solid-state and structural chemistry
  • He is the head of the Scientific Advisory Council to the President of India
  • He was conferred with China's top science award for the year 2013 for his contributions in boosting Sino-Indian scientific cooperation
  • He is a member of the US National Academy of Sciences
  • Question 30 :
  • The term albedo implies the

  • capacity to absorb solar radiation.
  • capacity to modify the path of solar radiation.
  • proportion of the shortwave solar radiation reflected by a surface.
  • amount of solar radiation returned to air by a surface.
  • Question 36 :
  • Presbyopia is a visual defect caused by

  • Elongation of the eye ball.
  • Shortened curvature of the eye lens.
  • Weakening of the ciliary muscles.
  • Gradually increasing flexibility of the eye lens.
  • Question 64 :
  • A beautiful rainbow on the sky is due to the

  • dispersion of sunlight from a water droplet only.
  • reflection of sunlight from a water droplet only.
  • reflection and refraction of sunlight from a water droplet only.
  • refraction, dispersion and reflection of sunlight from a water droplet.
  • Question 71 :
  • During sunrise and sunset, sun appears reddish-orange because

  • during that time sun emits only reddish-orange light.
  • all other colours are absorbed by the atmosphere.
  • reddish-orange light is least scattered by the atmosphere.
  • all other colours apart from reddish-orange are reflected back by the atmosphere. Show Answer
  • Explanation:

     

     

  • Question 87 :
  • A pressure cooker works on the principle of

  • elevation of boling point of water by application of pressure
  • making the food-grains softer by application of pressure
  • making the food-grains softer by application of pressure and temperature
  • keeping the food-grains inside steam for a longer time
  • Question 89 :
  • The presence of sulphur in gunpowder

  • decreases the ignition temperature.
  • increases the final temperature.
  • increases explosiveness of the gunpowder.
  • makes the powder smokeless.
  • Question 97 :
  • Turmeric (Haldi) rapidly becomes colourless on addition of

  • Baking soda
  • Vinegar
  • Lemon juice
  • No answer
  • Explanation:

    Turmeric changes its colour to red on addition of a basic solution (baking soda) but its colour does not change on addition of acidic or neutral solution (vinegar, lemon juice or alcohol). Hence no correct answer.

  • Question 98 :
  • Metalloids are

  • alloys of alkali metals with other metals.
  • colloids of metals.
  • elements having some properties of both metals and non-metals.
  • metals heavier than lead.
N D A Examination Solved Question Paper August 2013
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