**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

(c)11.1

(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

**Q4. **

(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

**Solutions:**

**Get Free Study Material For RRB NTPC EXAM 2019**

**Important Links for RRB NTPC Recruitment 2019**