296: A suitable site of a cement plant requires proximity to:
(a) Coal and iron
(b) Limestone and manganese
(c) Limestone and gypsum
(d) Coal and gypsum
297: "Reserprine" derived from the plant "Serpentina" is used to:
(a) Alleviate pains
(b) Alleviate high blood pressure
(c) Alleviate low blood pressure
(d) Cure rickets
298: Consider the following statements :
Chlorofluorocarbons, known as ozone-depleting substances, are used
1. in the production of plastic foams
2. in the production of tubeless tyres
3. in cleaning certain electronic components
4. as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
(a) 1, 2 and 3 only
(b) 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4
Explanation:
Except statement 2 all are correct.
299: Feeding of milk cattle with cotton seeds:
(a) Increases fat content temporarily
(b) Decreases fat content temporarily
(c) May decrease or increase fat content
(d) Causes no change in fat content
300: Which one of the following is an element?
(a) Ruby
(b) Sapphire
(c) Emerald
(d) Diamond