21.

The monomer of polythene is
A. vinyl chloride B. ethylene
C. ethyl alcohol D. None of the above
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
22.

The luster of a metal is due to
A. its high density B. its high polishing
C. its chemical inertness D. presence of free electrons
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
23.

The most malleable metal is
A. platinum B. silver
C. iron D. gold
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
24.

The oil used in the froth floatation process is
A. coconut oil B. olive oil
C. kerosene oil D. pine oil
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
25.

The items amenable to detection by soft x-rays are
A. contrabands B. lead in bullets
C. narcotics D. genuine coins from counterfeit coins
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.