86
Q:

# A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:

 A) 49 B) 50 C) 53.5 D) 55

Explanation:

Area of the wet surface = [2(lb + bh + lh) - lb]

= 2(bh + lh) + lb

= [2 (4 x 1.25 + 6 x 1.25) + 6 x 4]$m2$

= 49$m2$

Q:

The radii of the two circular faces of the frustum of a cone of height 21 cm are 5 cm and 3 cm. What is its volume in cub.cm

 A) 1020 B) 1058 C) 1078 D) 1025

Explanation:

0 30
Q:

The diameter of a sphere is twice the diameter of another sphere. The curved surface area of the first and the volume of the second are numerically equal. The numerical value of the radius of the first sphere is

 A) 3 B) 24 C) 8 D) 16

Explanation:

0 337
Q:

What happens to the volume (V) of the cuboid. if its length is doubled. height is doubled and breadth is kept the same?

 A) V B) V/2 C) 4V D) 2V

Explanation:

0 337
Q:

Find the total surface area (in sq.cm) of a right circular cylinder of diameter 21 cm and height 10 cm.

 A) 1353 B) 1287 C) 1678 D) 1728

Explanation:

4 1596
Q:

Find the area and circumference of a circle if the radius is 14 cm. (Take pi = 22/7)

 A) Area = 44 sq.cm; circumference = 308 cm B) Area = 616 sq.cm; circumference = 88 cm C) Area = 88 sq.cm; circumference = 616 cm D) Area = 308 sq.cm; circumference = 44 cm

Answer & Explanation Answer: B) Area = 616 sq.cm; circumference = 88 cm

Explanation:

1 2896
Q:

Find the curved surface area (in cm2) of a right circular cylinder of diameter 21 cm and height 10 cm.

 A) 594 B) 530 C) 472 D) 660

Explanation:

0 1593
Q:

The length, breadth and height of a cuboidal box are in the ratio 7 : 5 : 3 and its whole surface area is 27832 sq.cm. Its volume is:

 A) 288120 cub.cm B) 280120 cub.cm C) 208120 cub.cm D) 288100 cub.cm

Answer & Explanation Answer: A) 288120 cub.cm

Explanation:

0 340
Q:

Find the total surface area (in cm2) of a right circular cone of diameter 28 cm and slant height 12 cm.

 A) 1714 B) 1161 C) 1144 D) 1477