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Generan Knowiedpe for XAT
Which of the following metals is found in the Free State? (a) Aluminium(b) Magnesium (c) Calcium (d) Copper
Solution: d. Copper has a very low reactivity so it is found in the free state. Other three are highly reactive metals therefore they are never found in the free state.
Consider the following statements I. 22 carat gold is an alloy. II. 24 carat gold is very hard Which of the above statements is/are true? (a) I (b) II (c) I and II (d) none 172
Solution: a. 24 carat gold is very soft and hence not suitable for making ornaments. It is alloyed with either copper or silver to make it hard. In India, 22 carat id is used for making ornaments. It means 22 pa alloyed with 2 parts of either copper or silver.
Amalgam is an allov that contains- (a) Zinc (b) Mercurjy (c) Tin (d) Copper 173
Solution: b. Mercury combines with all the common metals except iron and platinum to form alloys that are called amalgams.
Solder is an alloy of- (a)Tin and Copper (b) Zinc and Lead (c) Zinc and Copper (d) Tin and Lead 174
Solution: d. Solder is an alloy of lead and tin (Pb and Sn). It is used for welding electrical wires together due to its low melting p. oint
Consider the following statements: I. Pitcher plant is a homotroph. Which of the above statements is/are true? Protein is one of the products of photosynthesis in plants (a) I (b) I (c) I and II (d) none 176
Solution: c. The inner walls of the small intestine have thousands of finger-like outgrowths called villi. The villi increase the absorption surface area for digestion providing efficient absorption of nutrients.
Solution: a. Galvanisation is a process of depositing a layer of zinc on iron or steel to prevent rusting
Lion-tailed macaque is naturally found in which of the following states? a) Gujarat (b) Madhya Pradesh (c) Kerala (d) Jammu and Kashmir 179
Solution: c. The lion-tailed macaque (also called Beard ape) lives in the rain forests of Western Ghats. It is thought to be the rarest old world monkey and is in serious danger of extinction
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