Basic quizz

Q.1 Smoking is harmful to all parts of the body specially the lungs,The chemical present in tobacco that affects the lungs is
   A.Nicotine
   B.Dopamine
   C.Caffeine

   D.Carbon

Answer:-A

Q.2 The human body is made up of several chemical elements; the element present in the highest              proportion (65%) in the body is
      A. carbon
      B. hydrogen
      C. oxygen
      D. nitrogen

Answer: Option C

Q.3 The major constituent of air is
      A. nitrogen
      B. carbon dioxide
      C. oxygen
      D. hydrogen

Answer: Option A