Q. 21 The purest form of iron is

A) steel

B) wrought iron

C) nickel steel

D) pig iron

✔ wrought iron
View Explanation

Q. 22 How many 100 watt bulbs on the supply of 220 volts can be safely used with 5 ampere fuse?

A) 5

B) 8

C) 11

D) 20

✔ 11
View Explanation

Q. 23 Which scientist discovered DDT?

A) Dr. Robert coach

B) G. Domague

C) Dr. Pal Muller

D) Dr. Harvey

✔ Dr. Pal Muller
View Explanation
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