3421: For reproducing sound, a CD (Compact Disc) audio player uses a
(a) quartz crystal
(b) titanium needle
(c) laser beam
(d) barium titanate ceramic
3422: Which of the following enters human body through skin:
(a) Tapeworm
(b) Hookworm
(c) Ringworm
(d) Threadworm
3423: Galvanised iron sheets are protected from rusting due to the presence of a layer of
(a) lead
(b) chromium
(c) zinc
(d) tin
3424: "Inquilab Zindabad" slogan was given by:
(a) Chandra Shekhar Azad
(b) Subhash Chandra Bose
(c) Bhagat Singh
(d) Iqbal
3425: The complete conversion of glucose In the presence of oxygen into carbon dioxide and water with release of energy is called
(a) aerobic respiration
(b) anaerobic respiration
(c) glycolysis
(d) hydrolysis