Q1. An alloy of iron and nickil weight 50g. It contains 80% iron. How much iron should be added to the alloy so that percentage of iron is increased to 90?
(a) 50 g
(b) 60 g
(c) 30 g
(d) 40 g
(e) 60 g
Q2. Three vessels contain equal mixtures of acid and water in the ratio 6 : 1, 5 : 2 and 3 : 1 respectively. If all the solutions are mixed together, the ratio of acid to water in the final mixture will be
(a) 64 : 65
(b) 65 : 19
(c) 19 : 65
(d) 64 : 19
(e) 39 : 17
Q3. How many kg of sugar worth Rs. 25 per kg must be blended with 30 kg of sugar worth Rs. 30 per kg so that by selling the blended variety at Rs. 30 per kg there should be gain of 10%?
(a) 30 kg
(b) 32 kg
(c) 36 kg
(d) 42 kg
(e) 34 kg
Q4. A mixture contains milk and water in the ratio 5 : 1. On adding 5 liters of water, the ratio of milk and water becomes 5 : 2. The quantity of milk in the original mixture is?
(a) 16 litres
(b) 25 litres
(c) 22.75 liters
(d) 32.5 liters
(e) 28 litres
Q5. A vessel contains 1 litre mixture of kerosine and disel and the other vessel contains 2 litre mixture of the same. The ratio of kerosine and disel in first and second vessels is 5 : 4 and 7 : 2 respectively. The mixture of second vessel is poured back to first vessel. Find the ratio of kerosine and disel in the first vessel.
(a) 8 : 11
(b) 9 : 8
(c) 19 : 8
(d) 11 : 19
(e) 11 : 8
Solutions (1-5):
Q6. A chemist has 10 litre of a solution that is 10% sulphuric acid by volume. He wants to dilute the solution to 4% strength by adding water how many litre of water must be added?
(a) 15
(b) 20
(c) 18
(d) 25
(e) 17
Q7. An alloy contains alluminium and zinc in the ratio 5 : 3 and another alloy contains alluminium and copper in the ratio 8 : 5. If equal weights of both the alloys are mixed together, then the weight of copper in the resulting alloy per kg will be
(a) 26/5
(b) 5/26
(c) 7/31
(d) 31/7
(e) None of these
Q8. Rishabh bought 25 kg of wheat at the rate of Rs. 6 per kg and 35 kg of wheat at the rate of Rs. 7 per kg. He mixed both type of wheat and sold the mixture at the rate of Rs. 6.75 per kg. What was his gain or loss in the transaction?
(a) Rs. 16, gain
(b) Rs. 16, Loss
(c) Rs. 20, gain
(d) Rs. 10, gain
(e) Rs. 10, loss
Q9. An alloy contains silver and lead in the ratio 5 : 8 and another alloy contains silver and lead in the ratio 5 : 3. If equal amount of both the alloys are melted together, then the ratio of silver and lead in the resulting alloy is
(a) 25 : 24
(b) 3 : 8
(c) 103 : 105
(d) 105 : 103
(e) 8 : 3
Q10. A manufacturer has 200 litres of Acid solution which has 15% acid content. How many litres of solution with 30% Acid content may be added so that Acid content in the resulting mixture will be more than 20% but less than 25%
(a) More than 100 litres but less than 300 litres
(b) More than 120 litres but less than 400 litres
(c) More than 100 litres but less than 400 litres
(d) More than 120 litres but less than 300 litres
(e) None of these
Solutions (6-10):
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