36. Non stick cooking utensils are coated with
(a) Teflon
(b) PVC
(c) black paint
(d) polystyrene
37. Permanent hardness of water can be removed by adding
(a) chlorine
(b) washing soda
(c) potassium permanganate
(d) bleaching powder
38. One fathom is equal to
(a) 6 feet
(b) 6 meters
(c) 60 feet
(d) 100 cm
39. In an atomic explosion, enormous energy is released which is due to
(a) conversion of chemical energy into heat energy
(b) conversion of mechanical energy into nuclear energy
(c) conversion of mass into energy
(d) conversion of neutrons into protons
40. Which among the following is a positively charged particle emitted by a radioactive element?
(a) Beta ray
(b) Alpha ray
(c) Cathode ray
(d) Gamma ray
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