521: The term Regional Comprehensive Economic Partnership often appears in the news in the context of the affairs of a group of countries known as
(a) G20
(b) ASEAN
(c) SCO
(d) SAARC
522: Who among the following is known for his work on medicine during the Gupta period ?
(a) Saumilla
(b) Sudraka
(c) Shaunaka
(d) Susrutha
523: Superconductors are so called because they
(a) Efficiently conduct heat from one hot body to another
(b) Offer no resistance to conduction of heat at high temperatures
(c) Offer no resistance to conduction of electricity at low temperatures
(d) Produce high temperatures while conducting electricity
524: Malaria fever is caused
(a) Immediately after mosquito bite
(b) Upon disintegration and bursting of red blood cells
(c) When the malaria causing germs reach the liver
(d) Upon release of toxins into blood
525: Which one of the following is NOT radioactive ?
(a) Astatine
(b) Francium
(c) Tritium
(d) Zirconium