Mensuration (Railway Maths) (Part – IX)

Total Questions: 50

41. Find the perimeter of a rectangle that has a length 5 m more than its width and a perimeter equal in value to one - third of its area. [RRB NTPC 26/07/2021 (Evening) ]

Correct Answer: (d) 50 m
Solution:

42. The length, breadth and height of a room are in the ratio 4 : 3 : 2. If the length and height are halved while the breadth is doubled, then the new area of the four walls of the room will: [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (c) decrease approximately by 42.86%
Solution:

43. The inside measurements of a tank show its 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom from inside at the rate of 75 paise per m² is: [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (a) Rs. 558
Solution:

44. Three circles of radius 3.5 cm are placed such a way that each circle touches the other two. The area of the portion enclosed by the circles is (take √3 = 1.732): [RRB NTPC 31/07/2021 (Evening)]

Correct Answer: (c) 1.967 cm²
Solution:

45. Two right circular cones of height 16.4 cm and 17.2 cm respectively have a base radius of 8.4 cm. These two cones are melted and recast into a sphere. Find the diameter of the sphere. [RRB JE 22/05/2019 (Evening)]

Correct Answer: (b) 16.8 cm
Solution:

46. Perimeter of an isosceles triangle is 32 cm. The base is 6/5 times the equal side. What is the area? [RRB JE 22/05/2019 (Evening)]

Correct Answer: (b) 48 cm²
Solution:

47. If the surface area of a cube is 3750 cm², then find its volume. [RRB JE 23/05/2019 (Evening)]

Correct Answer: (b) 15625 cm³
Solution:

48. What will be the cost of gardening a 1 m broad boundary around a rectangular plot having a perimeter of 340 m at the rate of Rs. 10 per square meter? [RRB JE 23/05/2019 (Evening) ]

Correct Answer: (b) Rs.3440
Solution:

49. The diagonal of the floor of a rectangular closet is 7.5 ft. The shorter side of the closet 4.5 ft. What is the area of the closet in square feet? [RRB JE 24/05/2019 (Morning) ]

Correct Answer: (a) 27 ft²
Solution:

50. In a rectangle, length : breadth = 4 : 3 . What is the value of length: diagonal? [RRB JE 24/05/2019 (Morning) ]

Correct Answer: (c) 4 : 5
Solution: