Mensuration (Railway Maths) (Part – VII)

Total Questions: 50

31. A maximum of how many pieces of exact 17 cm length can be cut from a 960 cm long rod ? [RRB NTPC 08/02/2021 (Morning) ]

Correct Answer: (a) 56
Solution:

Number of pieces of exact 17 cm length can be cut from a 960 cm long
rod = 960/17 = 56 approx

32. If the base of the cylinder is the same as that of a cone, and the height of the cylinder is also the same as that of the cone, then find the ratio of the volumes of the cylinder and the cone. [RRB NTPC 08/02/2021 (Evening) ]

Correct Answer: (d) 3 : 1
Solution:

33. The dimensions of an ice compartment in a refrigerator 8 cm × 5 cm × 4 cm How many ice cubes will it hold, if each ice cubes is 2 cm on its edge? [RRB NTPC 09/02/2021 (Morning) ]

Correct Answer: (c) 20
Solution:

34. When a wire is bent into the shape of a square, the area of the square is 81 cm². When the wire is bent into a semicircular shape shape, what will be the area of the semicircle? [take π = 22/7] [RRB NTPC 10/02/2021 (Morning) ]

Correct Answer: (a) 77 cm²
Solution:

35. Between a square of perimeter 44 cm and a circle of circumference 44 cm, which figure has a larger area and by how much? [RRB NTPC 10/02/2021 (Morning) ]

Correct Answer: (d) Circle, 33cm²
Solution:

36. If a triangle and a parallelogram are on the same base and between the same parallels, then the area of the triangle is equal to: [RRB NTPC 10/02/2021 (Evening) ]

Correct Answer: (c) half the area of the parallelogram
Solution:

37. The perimeters of five squares are 24cm, 32cm, 40cm, 76cm and 80cm respectively. The perimeter of another square whose area is equal to the sum of the areas of these squares will be: [RRB NTPC 10/02/2021 (Evening) ]

Correct Answer: (c) 124 cm
Solution:

38. The minute hand of a watch is 1.5 cm long. How far does its tip move in 40 minutes? (Take π = 3.14) [RRB NTPC 10/02/2021 (Evening) ]

Correct Answer: (a) 6.28 cm
Solution:

39. If the side of a square is 1/10 m, then how many such squares will get accommodated in a bigger square of side 4 m? [RRB NTPC 10/02/2021 (Evening) ]

Correct Answer: (d) 1600
Solution:

40. The breadth of a rectangular plot of land is one third of its length. If the perimeter of the plot is 240 m, then what is the length of the plot? [RRB NTPC 11/02/2021 (Morning) ]

Correct Answer: (c) 90 m
Solution:

Let length of the plot = 3x
Breadth = x
2(3x + x) = 240 ⇒ 8x = 240 ⇒ x = 30
Length of the plot = 3 × 30 = 90 m