21.

22.

23.

24.

25.

26.

27.

Which of the following statements is/are wrong about the non-ferrous metal, copper?
(1) Itis a malleable and ductile metal

(ii) It is a good conductor of electricity

(iii) Galena is the ore of copper

(iv) It is a good insulator against nuclear radiation

(A) Only i & ii (B) Only iv

(C) Only iii & iv (D) Only ii & iii

Which heat treatment process is employed to increase the wear resistance of steel?
(A) Annealing (B) Tempering
(C) Normalising (D) Hardening

_ ‏کا‎ used as a reducing agent in blast furnace in the production of pig iron.
(A) Limestone (B) Coke
(C) Magnetite (D) Hematite

Which of the following welding methods requires a non-consumable electrode?
(A) Shielded metal arc welding (B) Gas metal arc welding

(C) Gas tungsten arc welding (D) Carbon dioxide welding

Identify the correct statement/statements about soldering fluxes.
(i) They are classified as organic and inorganic

(ii) Fluxes prevent corrosion

(iii) It helps molten solder to flow easily

(iv) It promotes oxidation

(A) Only i & ii (B) Only ii & iii

(C) Only i, iii, & iv (D) Only i, ii & iii

What is the effect of current works on electroplating?

(A) X-ray effect (B) Magnetic effect
(C) Skin effect (D) Chemical effect

What is the full form of BIS?

(A) Bureau of Indian Standards (B) Board of Indian Standard
(C) Board of International Standard (D) Bureau of International Standard

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