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1581. The major constituents of portland cement include

A. lime, silica and iron oxide

B. lime, silica and magnesia

C. silica, aflumina and magnesia

D. lime, silica and alumina

Explanation:

1582. A triode differs from a diode in that

A. it has vacuum inside.

B. its current is caused by photoelectric effect.

C. it can amplify a signal.

D. it has a geated cathode.

Explanation:

1583. Which of the following are synthetic rubbers ? 1. Thiokol 2. Isoprene 3. Neoprene

A. 1 and 2

B. 2 and 3

C. 1 and 3

D. 1, 2 and 3

Explanation:

1584. Non stick cooking utensils are coated with

A. black paint

B. PVC

C. teflon

D. polystyrene

Explanation:

1585. Which of the following is a physical change ?

A. Oxidation

B. Reduction

C. Sublimation

D. Decomposition

Explanation:

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