21. Lead is widely used in-

A. Transformers

B. Switch gears

C. Batteries

D. Galvanized pipes

Click for Answer/Explanation

Correct Answer is C

Ex- Lead-Acid Batteries

22. Phenol formaldehyde is-

A. a rubber

B. an elastomer

C. a thermoplastic material

D. a thermoset polymer

Click for Answer/Explanation

Correct Answer is D

23. What is the Coordination Number for FCC crystal structure-

Read More- Physical Quantities and Measurements

A. 4

B. 8

C. 12

D. 16

Click for Answer/Explanation

Correct Answer is C

For FCC and HCP structure 12

BCC – 8

Simple Cubic 6

24. Addition of magnesium to Cast Iron increases its-

A. ductility and strength in tensile

B. hardness

C. creep strength

D. corrosion resistance

Click for Answer/Explanation

Correct Answer is A

25. Addition of vanadium to steel results in improvement of-

A. hardenability

B. fatigue strength

C. heat treatability by quenching

D. resistance to oxidation at elevated temperature

Click for Answer/Explanation

Correct Answer is A

Apart from increasing hardenability, it also improves shock and fatigue strength.

Please Comment Below