Government CDS Question: Download Government CDS PDF

By which one of the following, an old written material which cannot be read easily, can be read?
(A) γ–rays
(B) X–rays
(C) IR–rays
(D) Radiofrequency waves

(B) X–rays

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Which one of the following is used as a mordant in dyeing and tanning industry? (A) Magnesium oxide (B) Magnesium carbonate (C) Magnesium chloride (D) Magnesium sulphate	Which one of the following characteristics is common among parrot, platypus and kangaroo? (A) Oviparity (B) Toothless jaws (C) Homothermy (D) Functional postanal tail