4361: In a remote Indian village with a scarcity of fuel, the people draw water from a well. They should be advised before drinking that water to:
(a) Boil it
(b) Use ion exchange resins
(c) Use solar stills for distilling
(d) Use potassium permanganate for purifying the water
4362: Projects and Development India Limited is Mainly engaged is design engineering, procurement and supervision of construction/commissioning in which area?
(a) Pharmaceutical plants
(b) Petroleum refineries and sugar factories
(c) Ship-building yards
(d) Fertilliser and allied chemical plants
4363: A rectangle has a perimeter of 50 meters. If its length is 13 metres more than its breadth, then its area is
(a) 124 m2
(b) 144 m2
(c) 114 m2
(d) 104 m2
4364: Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?
(a) Nickel and cadmium
(b) Zinc and carbon
(c) Lead peroxide and lead
(d) Iron and cadmium
4365: A circle (C), a square (S) and an equilateral triangle (T) have the same perimeter or circumference. The correct increasing order of their areas will be:
(a) T, S, C
(b) C, T, S
(c) T, C, S
(d) C, S, T