Air & Water
(A) solid (B) liquid (C) gas (D) steam
(A) condensation (B) melting
(C) boiling (D) evaporation
(A) It turns to steam (B) It turns to ice
(C) It remains the same (D) None of the above
(A) We should turn off the taps after using them
(B) We should not let the tap run when we brush our teeth
(C) We should not waste water while bathing
(D) All of these
(A) germs (B) salts (C) particles (D) none of these
(A) Ice (B) Dew (C) Steam (D) Heat
(A) pollution (B) monsoons (C) waves (D)gale
(A) ice (B) mountains (C) oceans (D) deserts
(A) Car (B) Soil (C) Water (D) Animals.
(A) windmill (B) weather cock
(C) barometer (D) thermometer.
Answers Keys:
(21)–(C); (22)–(D); (23)–(C); (24)–(D); (25)–(A); (26)–(C); (27)–(C); (28)–(C); (29)–(C); (30)–(B)