Basic Science Questions with Answers

Q.33 Galvanised iron sheets have a coating of

(A) lead

(B) chromium

(C) zinc

(D) tin

Q.34 Among the various allotropes of carbon,

(A) coke is the hardest, graphite is the softest

(B) diamond is the hardest, coke is the softest

(C) diamond is the hardest, graphite is the softest

(D) diamond is the hardest, lamp black is the softest

Q.35 The group of metals Fe, Co, Ni may best be called as

(A) transition metals

(B) main group metals

(C) alkali metals

(D) rare metals

Q.36 Heavy water is

(A) deuterium oxide

(B) PH7

(C) rainwater

(D) tritium oxide

Q.37 The chemical (ethyl mercaptan) added to the otherwise odorless LPG cooking gas for imparting a detectable smell to the gas is a compound of

(A) bromine

(B) fluorine

(C) chlorine

(D) sulfur

Q.38 The element common to all acids is

(A) hydrogen

(B) carbon

(C) sulfur

(D) oxygen

Q.39 Non-stick cooking utensils are coated with

(A) Teflon

(B) PVC

(C) black paint

(D) polystyrene

Q.40 Monazite is an ore of

(A) titanium

(B) zirconium

(C) iron

(D) thorium

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