Mathematics Quiz For RRB NTPC : 15th January 2020 for Mensuration, Percentage and algebra

Q1. Curved surface area of a cylinder is 1232 sq cm. If circumference of its base is 154 cm, then what will be the height of the cylinder? (Take π = 22/7)
(a) 16 cm
(b) 4 cm
(c) 8 cm
(d) 12 cm

Q2. A student multiplied a number by 3/10 instead of 10/3. What is the percentage error in the calculation?
(a) 1011.11 percent
(b) 45.5 percent
(c) 91 percent
(d) 505.56 percent

Q3. What is the area of the sector whose central angle is 90° and radius of the circle is 14 cm?
(a) 308 sq cm
(b) 77 sq cm
(c) 154 sq cm
(d) 231 sq cm

Q4. Coefficient of x² in (x + 9)(6 – 4x)(4x – 7) is
(a) 216
(b) -4
(c) -92
(d) 108

Q5. Given: 5x -3(2x-7) > 3x – 1 < 7 + 4x; then x can take which of the following values?
(a) 6
(b) 9
(c) -6
(d) -9

Q6. A missile travels at 1422 km/h. How many metres does it travel in one second?
(a) 395 metres
(b) 400 metres
(c) 364 metres
(d) 319 metres

Q7. The bus fare between two cities is increased in the ratio 17:20. Find the increase in the fare, if the original fare is Rs. 425
(a) Rs 500
(b) Rs 100
(c) Rs 200
(d) Rs 75

Q8. (secA – 1)/(secA + 1) is equal to?
(a) (1 – sinA)/(1 + sinA)
(b) (1 + cosA)/(1 – cosA)
(c) (1 + sinA)/(1 – sinA)
(d) (1 – cosA)/(1 + cosA)

Q9. If cos3A = X, then value of X?
(a) 4cos3A – 3cosA
(b) 4cos3A + 3cosA
(c) 3cosA – 4cos3A
(d) cosA + 4cos3A

Q10. In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?
(a) 72
(b) 73
(c) 69
(d) 71

Solutions:

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