46
Q:

# The dimensions of an open box are 50 cm, 40 cm and 23 cm. Its thickness is 2 cm. If 1 cubic cm of metal used in the box weighs 0.5 gms, find the weight of the box.

 A) 8.04kg B) 8.14kg C) 8.24kg D) 9.04kg

Explanation:

Volume of the metal used in the box = External Volume - Internal Volume

= [(50 x 40 x 23) - (44 x 34 x 20)] cu.cm

= 16080 cu.cm

Weight of the metal =[(16080 x 0.5)/1000] kg = 8.04 kg.

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:

0 139
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:

4 880
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 1388
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:

0 822
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:

0 209
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:

1 210
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:

1 332
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