Mathematics Quiz For RRB NTPC : 28th November

Q1. The area of a circle is 441π square cm. The length of its longest chord (in cm.) is
(a) 32
(b) 42
(c) 21
(d) 28

Q2. Average of 13 numbers is 9 if the average of first 7 numbers be 7.5 and the average of last 7 numbers be 10.8. then the middle number?
(a) 13.3
(b) 14.4
(d) 15.5

Q3. The average of prime numbers between 1 to 30 is
(a) 12.9
(b) 12.2
(c) 13.4
(d) 14.4

(a)135 : 16
(b)3 : 5
(c)16 : 135
(d)5 : 3

Q5. There is a ratio of 8 : 9 between two numbers if 20 percent of the first is 40. The 10% of the second number is
(a) 15.2
(b) 12.5
(c) 22.5
(d) 14.2

Q6. How much of Rs. 171 exceeds Rs. 30 ?
(a) 4
(b) 8
(c) 32
(d) None of these

Q7. If there is a profit of 15% on the selling price of the article. Find real profit percent.

Q8. A single discount equivalent to the successive discounts of 20%, 15% and 5% is
(a) 35.4%
(b) 32%
(c) 40%
(d) can’t be determined

Q9. At what rate per annum will Rs. 3200 yield compound interest of Rs. 504.4 in 9 months interest being compound quarterly?
(a) 20%
(b) 32%
(c) 50%
(d) 80%

Q10. A, B and C can do a piece of work in 60 day, A and B in 72 day find the day in which C alone can complete half of the work.
(a) 120 days
(b) 180 days
(c) 145 days
(d) 360 days




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