2771: Carpenter A can make a chair in 6 hours, carpenter B in 7 hours and carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days ?
(a) 61
(b) 73
(c) 67
(d) 79
2772: Natural rubber is a plant product which is chemically known as
(a) Mucilage
(b) Gum
(c) Latex
(d) Resin
2773: Which one of the following statements is not correct?
(a) Gulfs with narrow fronts and wider rears experience high tides.
(b) Tidal currents take place when a gulf is connected with the open sea by a narrow channel.
(c) Tidal bore occurs when a tide enters the narrow and shallow estuary of a river.
(d) The tidal nature of the mouth of the river Hooghly is of crucial importance to Kolkata as port.
2774: Through which one of the following groups of countries does the Equator pass ?
(a) Colombia, Kenya and Indonesia
(b) Venezuela, Ethiopia and Indonesia
(c) Brazil, Sudan and Malaysia
(d) Brazil, Zambia and Malaysia
2775: Which one of the following is in the correct sequential order in which these appeared under simulated primitive earth condition ?
(a) Methane, Hydrogen cyanide, nitriles, aminoacids
(b) Hydrogen cyanide, methane, nitriles, aminoacids
(c) Aminoacids, nitriles. Hydrogen cyanide, methane
(d) Nitriles, aminoacids, methane, Hydrogen cyanide