100 Questions
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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?

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

  • Acapacity to absorb solar radiation.
  • Bcapacity to modify the path of solar radiation.
  • Cproportion of the shortwave solar radiation reflected by a surface.
  • Damount of solar radiation returned to air by a surface.
  • Question 36 :
  • Presbyopia is a visual defect caused by

  • AElongation of the eye ball.
  • BShortened curvature of the eye lens.
  • CWeakening of the ciliary muscles.
  • DGradually increasing flexibility of the eye lens.
  • Question 64 :
  • A beautiful rainbow on the sky is due to the

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

  • Aduring that time sun emits only reddish-orange light.
  • Ball other colours are absorbed by the atmosphere.
  • Creddish-orange light is least scattered by the atmosphere.
  • Dall 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

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

  • Adecreases the ignition temperature.
  • Bincreases the final temperature.
  • Cincreases explosiveness of the gunpowder.
  • Dmakes the powder smokeless.
  • Question 97 :
  • Turmeric (Haldi) rapidly becomes colourless on addition of

  • ABaking soda
  • BVinegar
  • CLemon juice
  • DNo 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

  • Aalloys of alkali metals with other metals.
  • Bcolloids of metals.
  • Celements having some properties of both metals and non-metals.
  • Dmetals heavier than lead.