551: The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?
(a) Ice is a bad conductor of heat
(b) Since the surface of the lake is at the same temperature as the air, no heat is lost
(c) The density of water is maximum at 4 degree celcius
(d) None of the statements (a), (b) and (c) given above is correct.
552: Four wires of same material and of dimensions as under as stretched by a load of same magnitude separately. Which one of them will be elongated maximum ?
(a) Wire of 1 m length and 2 mm diameter
(b) Wire of 2 m length and 2 mm diameter
(c) Wire of 3 m length and 1.5 mm diameter
(d) Wire of 1 m length and 1 mm diameter
553: Among the following, which were frequently mentioned in the news for the outbreak of Ebola virus recently?
(a) Syria and Jordan
(b) Guinea, Sierra Leone and Liberia
(c) Philippines and Papua New Guinea
(d) Jamaica, Haiti and Surinam
554: The recent Land Mines Conference to sign the historic treaty was held in the Capital city of
(a) Canada
(b) Japan
(c) Sweden
(d) Zimbabwe
555: The last opportunity to avoid the partition of India was lost with the rejection of
(a) Cripps Mission
(b) Rajagopalachari Formula
(c) Cabinet Mission
(d) Wavell Plan