846: In an accurate clock, on a period of 2 hours 20 minutes, the minute hand will move over
(a) 520°
(b) 320°
(c) 840°
(d) 140°
847: Who among the following discovered heavy water?
(a) Joseph Priestley
(b) Heinrich Hertz
(c) H. C. Urey
(d) G. Mendel
848: EFGH : DEFG :: OPQR : ___?___
(a) PQRS
(b) NOPQ
(c) MNOP
(d) QRST
849: In the constitution of India, promotionof international peace and security is included in the
(a) Preamble to the Constitution
(b) Directive Principles of State Policy
(c) Fundamental Duties
(d) Ninth Schedule
850: Savanna grasslands are found in
(a) North America
(b) Africa
(c) Australia
(d) East Asia