Q2. In an alloy, the ratio of copper and zinc is 5 : 2. If 1.250 kg. of zinc is mixed in 17 kg 500 gm of alloy. Then the ratio of copper and zinc will be
(a) 2 : 1
(b) 2 : 3
(c) 3 : 2
(d) 1 : 2
Q3. The ratio between principal to amount is 4 : 5 for certain time and on certain rate of interest. After 3 years that ratio becomes 5 : 7. Find rate of interest.
(a) 4%
(b) 5%
(c) 8%
(d) 10%
(a) 20
(b) 25
(c) 15
(d) 30
Q5. A purse contains 225 currency notes consisting of Rs. 5, Rs. 10 and Rs. 50 currencies in the ratio 3 : 7 : 5 respectively. Out of this Rs. 25 is spent and the left out money is exchanged for Rs. 500 currency notes. Then the number of 500 rupee currency notes is
(a) 10
(b) 20
(c) 15
(d) 5
(b) 4 : 3 : 2
(c) 6 : 4 : 3
(d) 2 : 4 : 3
Q7. In a mixture salt and water, quantity of salt is 15%. 30 kg water evaporated and the quantity of salt become 20% in the new mixture. Find original quantity of mixture.
(a) 100 kg
(b) 120 kg
(c) 125 kg
(d) 150 kg
Q8. Rs. 430 are divided among 45 persons consisting of men, women and children. The combine share of all men, all women and all children are into ratio 12 : 15 : 16, whereas the individual shares of a man, woman and a child are in the ratio 6 : 5 : 4. Find the number of men, women and children and also what 1 man, 1 woman and 1 child get?
(a) Rs. 12, 10, 8
(b) Rs. 10, 8, 6
(c) Rs. 14, 10, 8
(d) Rs. 12, 10, 9
Q10. Three cubes of sides 6 cm, 8 cm and 1 cm are melted to form a new cube. The surface area of the new cube is
(a) 486 cm2
(b) 496 cm2
(c) 586 cm2
(d) 658 cm2
Q11. If the area of the base of a cone is 770 cm2 and the area of the its curved surface is 814 cm2, then find its volume.
(a) 213√5 cm^3
(b) 392√5 cm^3
(c) 550√5 cm^3
(d) 616√5 cm^3
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