Mensuration (Railway Maths) (Part – V)

Total Questions: 50

41. Find the cost of painting all surfaces of a 10 m long hollow steel pipe whose internal and external diameters measure 15 cm and 17 cm respectively, if the cost of painting 1 cm² of the surface is ₹0.15. (Use π = 22/7) [Level 3 (17/06/2022) Shift 3]

Correct Answer: (a) ₹15100.80
Solution:

42. The total cost of flooring a room at ₹12.50 per m² is ₹3,675. If the breadth and length are in the ratio 2 : 3, find its length. [RRB NTPC 29/12/2020 (Morning)]

Correct Answer: (a) 21 m
Solution:

43. A cylindrical tank has a capacity of 6160 m³. If the diameter of the base of the tank is 28 m, then the depth of the tank (in m) is [RRB NTPC 29/12/2020 (Evening)]

Correct Answer: (d) 10
Solution:

44. The base of an isosceles triangle is 8 cm and one of its equal sides is 5 cm. The height of the vertex opposite to the base from the base is: [RRB NTPC 30/12/2020 (Morning) ]

Correct Answer: (b) 3 cm
Solution:

45. Find the length of the longest pole that can be placed in a room of dimensions 30 m × 15 m × 10 m. [RRB NTPC 30/12/2020 (Morning)]

Correct Answer: (d) 35 m
Solution:

46. A cuboid having the surface area of 3 adjacent faces as a, b, c has the volume [RRB NTPC 30/12/2020 (Morning)]

Correct Answer: (d)
Solution:

47. The length, breadth and height of a cuboid are 27 cm, 18 cm and 21 cm. How many cubes of side 3 cm can be cut from the cuboid? [RRB NTPC 30/12/2020 (Evening)]

Correct Answer: (b) 378
Solution:

48. If the length and breadth of a rectangular plot of land are increased by 10% and 8% respectively, then by how much percentage will the area increase or decrease? [RRB NTPC 30/12/2020 (Evening)]

Correct Answer: (c) 18.8% increase
Solution:

49. A man walks around a circular pond exactly once. If his step is 44 cm long and he takes 700 steps to go around the pond, find the area of the pond. [RRB NTPC 30/12/2020 (Evening)]

Correct Answer: (d) 7546 m²
Solution:

50. Find the answer of given question? [RRB NTPC 04/01/2021 (Morning) ]

Correct Answer: (c) 5
Solution: