5999+ TNPSC Group 4 Previous Year Question Papers Pdf - 2

Question: 6

Which one of the following phosphorous is most reactive?

(A) Scarlet phosphorus

(B) Violet phosphorus

(C) Black phosphorus

(D) White phosphorus

Question: 7

Salts of which of the following elements provide colours to fireworks?

(A) Chromium and nickel

(B) Strontium and barium

(C) Potassium and mercury

(D) Zinc and sulphur

Question: 8

Grain alcohol is common name of

(A) Ethyl alcohol

(B) Amyl alcohol

(C) Methanol

(D) None of these

Question: 9

Bar is a unit of

(A) Energy

(B) Frequency

(C) Force

(D) Pressure

Question: 10

The art of electroplating was given by

(A) Edison

(B) Brugan

(C) Thomas Grahan

(D) Faraday