325. The process of heat transfer without actual movement of the particles themselves is called
(a) Convection
(b) Radiation
(c) Conduction
(d) None of these
326. Bronze is an alloy of
(a) Copper and tin
(b) Copper and zinc
(c) Iron and copper
(d) Zinc and tin
327. The periodic rise and fall of water in sea causes
(a) Currents
(b) Waves
(c) Tides
(d) None of these
328. Marble is extracted from
(a) Quartz
(b) Silica
(c) Limestone
(d) None of these
329. Ecology deals with
(a) The shape and the area of the earth
(b) The relation between organisms and their environment
(c) The mental and physical states of the mankind
(d) The science of universe as a whole
330. Varahmihir was a/an
(a) Mathematician
(b) Astronomer
(c) Chemist
(d) Biologist
331. Zero was invented by the
(a) Greeks
(b) Iranians
(c) Indians
(d) Egyptians
332. The fastest animal is
(a) Cheetah
(b) Zebra
(c) Tiger
(d) Horse
333. Heart attack is caused due to the excess of
(a) Blood protein
(b) Cholesterol
(c) Blood sugar
(d) Blood urea
334.In the reaction C+ H2O—->CO+H2 water acts as a(n)
(a) Oxidising agent
(b) Reducing agent
(c) Dehydrating agent
(d) Catalyst
335. The most important source of energy in villages is
(a) Gobar gas
(b) Kerosene
(c) Solar energy
(d) Electricity
336. CuSO4.5H2O is a
(a) White vitriol
(b) Blue vitriol
(c) Hydro-chloric acid
(d) Propanoic acid