Q.471 Which two metals combine to form Bell metal?
(A) nickel and copper
(B) zinc and copper
(C) tin and copper
(D) brass and nickel
Q.472 Which of the following metals is known to pollute the air of big cities with a large number of vehicles?
(A) Lead
(B) Mercury
(C) Iron
(D) Copper
Q.473 Which of the following metals is used in making the filament of an electric bulb?
(A) platinum
(B) tungsten
(C) carbon
(D) chromium
Q.474 Which one among the following metals is used for making boats because it does not corrode by seawater?
(A) Tungsten
(B) Nickel
(C) Antimony
(D) Titanium
Q.475 Which one of the following metals/alloys is used in electric heating elements?
(A) Nichrome
(B) Chromium
(C) Steel
(D) Bronze
Q.476 Why are noble metals so named?
(A) Because they are expensive
(B) Because they are generally resistant to corrosion and oxidation
(C) Because they are rarely found in the earth
(D) Because they are more malleable and ductile than others
Q.477 Due to its reactivity, the alkali metal sodium is stored in -
(A) water
(B) alcohol
(C) kerosene
(D) ethanol
Q.478 Thin foils of which of the following metals are used in decorating sweets?
(A) steel
(B) aluminium
(C) chromium
(D) silver
Q.479 Which of the following metals has been used in making the Statue of Liberty?
(A) gold
(B) iron
(C) bronze
(D) copper
Q.480 Metals are good conductors of electricity because
(A) they are electrically unstable
(B) atoms in their molecules are loosely packed
(C) they have free electrons
(D) they are ductile
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