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Q:

# The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

 A) 25% increase B) 50% increase C) 50% decrease D) 75% decrease

Explanation:

Let original length = x and original breadth = y.

Original area = xy.

New length = x/2 and New breadth = 3y.

New area = (x/2 * 3y) = (3/2 )xy

Therefore,  Increase % = [(1/2)xy * (1/xy) * 100] % = 50%

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:

1 570
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:

0 623
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:

0 640
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

Explanation:

0 142
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

Explanation:

1 138
Q:

If the edge of a cube is increased by 4 cm, the volume will increase by 988 . Then the original length of each edge of the cube is

 A) 7 cm B) 6 cm C) 9 cm D) 8 cm

Explanation:

1 253
Q:

Find the height of a cuboid whose volume is 330 $cm2$and base area is 15$cm2$ .

 A) 21 cm B) 24 cm C) 22 cm D) 19 cm

Explanation:

0 716
Q:

Find the volume () of a cuboid of length, breadth and height of 7.5 cm, 5 cm and 6 cm respectively.

 A) 195 B) 180 C) 225 D) 173