25.)Photoelectric effect was discovered by ___ (A)Einstein (B)Hertz (C)Bohr (D)Plank View Answer Correct Answer: A. 26.)The hydrogenation of the vegetables oils takes place in the presence of finely divided ___ (A)Aluminum (B)Charcoal (C)Silica (D)Nickel View Answer Correct Answer: D. 27.)In which of the following processes light energy is converted into chemical energy? (A)Respiration (B)Fermentation (C)Photosynthesis (D)Photorespiration View Answer Correct Answer: C. 28.) Air is a/an A.CompoundB.Element C.ElectrolyteD.Mixture View Answer Correct Answer: D. 29.) Gobar gas contains mainly ___ (A)Methane (B)Carbon dioxide (C)Butane (D)Carbon Monoxide View Answer Correct Answer: A. 30.) The most malleable metal is ___ (A)Silver (B)Gold (C)Aluminum (D)Sodium View Answer Correct Answer: B.