Related Questions

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?
A 49 : 48
B 7 : 7
C 8 : 6\
D 3 : 4
A cement mixture is composed of 3 elements. By weight, 1/3 of the mizture is sand, 3/5 is water and the remaining 12 pounds of the mixture is gravel. What is the weight of the entire mixture in pounds?
A 60
B 80
C 90
D 180
A jar contains a mixture of oil and water in the ratio 22 :3 . 50 litres of the mixture was taken out and 25 litres of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in litres ) in the jar?
A 175
B 150
C 75
D 125
A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?
A 1ml
B 1.5ml
C 2.5ml
D 6ml
Naphthalene is removed from coke oven gas by
A Adsorbing on palladium
B Absorbing in ethanolamine
C Scrubbing with wash oil
D Passing it through electrostatic precipitator
The chief source of naphthalene is
A Coal-tar
B Diesel
C Charcoal
D Camphor
The main source of Naphthalene is
A Charcoal
B Camphor
C Coal-tar
D Diesel
Catalytic oxidation of naphthalene produces
A Styrene
B Phenol
C Phthalic anhydride
D None of these
Naphthalene is used for making
A Insecticides (e.g. moth balls)
B Unsaturated polyesters
C Drug intermediates e.g. β-naphthol
D All of the above
Naphthalene recovered from coke oven gas is used
A As moisture proof coating on fibres
B As moth balls (insecticides)
C As a fuel in furnaces
D For making electrodes

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