501: 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.
502: Consider the following statements:
1. The Parliament of Russia is called Federal Assembly.
2. The Council of the Federation in the Russian Parliament is the lower house.
3. The name of the upper house in the Russian parliament is State Duma.
Which of the following statements given above is/are correct?
(a) 1 only
(b) 1 and 2
(c) 2 and 3
(d) 1, 2 and 3
503: There are more anti-bacterial drugs than anti-viral drugs because
(a) Bacterial diseases are intra-cellular.
(b) Viral diseases are intra-cellular.
(c) Virus are smaller than bacteria.
(d) Drugs can penetrate bacteria more effectively
504: Consider the following statements :
1. In the year 2006, India successfully tested a full-fledged cryogenic stage in rocketry.
2. After USA, Russia and china, India is the only country to have acquired the capability for use of cryogenic stage in rocketry.
Which of the statements given above is are correct ?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
505: P is 300 km eastward of O and Q is 400 km north of O. R is exactly in the middle of Q and P. The distance between Q and R is
(a) 250 km
(b) 300 km
(c) 350 km
(d) 250 km multiply root 2