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Mathematics Quiz For RRB NTPC : 17th February For Profit & Loss, Average

S1. If the sum of a number and its reciprocal be 2, then the number is
(a) 0
(b) 1
(c) – 1
(d) 2

S2. The area of a rectangle in 60 and its perimeter is 34 cm, then the length of the diagonal is:
(a) 17 cm
(b) 11 cm
(c) 15 cm
(d) 13 cm

S3. A cloth merchant has announced 25% rebate in prices. If one needs to have a rebate of 40, then how many metres of cloth costing 32 per metre he should purchase.
(a) 6m
(b) 5m
(c) 10m
(d) 7m

S4. A profit of Rs. 960 is divided between A and B in the ratio 1/3:1/2. The difference of their profit is:
(a) Rs. 120
(b) Rs. 160
(c) Rs. 192
(d) Rs. 240

S5. The average monthly salary of 19 members of a group is Rs. 16000. If one more members whose monthly salary is Rs. 20000 has joined the group, then the average salary of the group is:
(a) Rs. 18250
(b) Rs. 16200
(c) Rs. 18000
(d) Rs. 16250

S6. A T.V was sold at a profit of 5% If it had been sold at a profit of 10%, the profit would have been Rs. 1000 more. What is its cost price?
(a) Rs. 20000
(b) Rs. 5000
(c) Rs. 10000
(d) Rs. 15000

S7. The price of an article is decreased by 10%. To restore it to its former value, the new price must be increased by:

S8. A moving train passes a platform 50m long in 14 seconds and a lamp post in 10 seconds. The speed of the train (in km/h) is:
(a) 24
(b) 36
(c) 40
(d) 45

S9. An angle in a semicircle is:
(a) 45°
(b) 60°
(c) 90°
(d) 120°

S10. A sum of Rs. 2000 amounts to Rs. 4000 in two years at compound interest. In how many years does the same amount becomes Rs. 8000.
(a) 2
(b) 4
(c) 6
(d) 8

Solutions:

S9. Ans. (c);
Sol. 90°

S10. Ans. (b);
Sol. in 4 years

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