Mensuration (Railway Maths) (Part – VII)

Total Questions: 50

41. If a circle has a radius of 4 cm then the area of the largest square that would fit inside the entire circle would be ______. [RRB NTPC 11/02/2021 (Evening) ]

Correct Answer: (d) 32 cm²
Solution:

42. Let 30 cm and 18 cm be the lengths of the two parallel sides of a trapezium and 24 cm, be distance between these two sides. If the area of this trapezium is equal to the area of a square, then the perimeter of the square will be: [RRB NTPC 12/02/2021 (Morning) ]

Correct Answer: (c) 96 cm
Solution:

43. The paint in a container is m². How many bricks, each measuring 22.5 cm x 10 cm x 7.5 cm can be painted with the paint in the container? [RRB NTPC 12/02/2021 (Morning) ]

Correct Answer: (c) 100
Solution:

44. The altitudes of two similar triangles are 4 cm and 6 cm. If the areaof the larger triangle is 36 cm², what will be the area of the other one? [RRB NTPC 12/02/2021 (Morning) ]

Correct Answer: (a) 16 cm²
Solution:

45. There is a rectangular field of dimensions 100 m and 80 m respectively. If a path of uniform width 10 m runs around and inside it, then the area of path will be. [RRB NTPC 12/02/2021 (Morning) ]

Correct Answer: (c) 3200 m²
Solution:

46. ABC is a right -angled triangle . If the lengths of two sides containing the right angle are 4 cm and 3 cm. The radius of its incircle is: [RRB NTPC 15/02/2021 (Morning) ]

Correct Answer: (a) 1 cm
Solution:

47. An object is in the form of a trapezium with height 5 m and parallel sides being 4 m and 6 m. What is the cost of painting the object if the rate of painting is Rs. 50 per square meter. [RRB NTPC 15/02/2021 (Morning) ]

Correct Answer: (a) Rs.1,250/-
Solution:

48. Calculate the total surface area of a cone if the radius is r/4 and its slant height is 4l. [RRB NTPC 15/02/2021 (Evening) ]

Correct Answer: (c)
Solution:

49. A large cube is formed by melting three smaller cubes of sides 3 cm, 4 cm and 5 cm each. The ratio of the surface areas of the three smaller cubes together to the large cube is. [RRB NTPC 17/02/2021 (Morning) ]

Correct Answer: (a) 25 : 18
Solution:

50. The perimeter of the floor of a room is 18 m. What is the area of the walls of the room, if the height of the room is 3 m? [RRB NTPC 22/02/2021 (Morning) ]

Correct Answer: (a) 54 m²
Solution:

Area of walls = perimeter x height
Area of all 4 walls = 18 x 3 = 54 m²