631
Q:

If each side of a square is increased by 25%, find the percentage change in its area?

 A) 65.25 B) 56.25 C) 65 D) 56

Explanation:

let each side of the square be a , then area = $a2$

As given that The side is increased by 25%, then

New side = 125a/100 = 5a/4

New area = $5a42$

Increased area= $25a216-a2$

Increase %=$9a2/16a2*100$  % = 56.25%

Q:

A quadrilateral is inscribed in a circle. If the opposite angles of the quadrilateral are equal and length of its adjacent sides are 6 cm and 8 cm, what is the area of the circle?

 A) 64π sq cm B) 25π sq cm C) 36π sq cm D) 49π sq cm

Explanation:

0 1
Q:

A tent is to be built in the form of a cylinder of radius 10 m surmounted by a cone of the same radius. If the height of the cylindrical part is 5 m and slant height of the conical part is 15 m, how much canvas will be required to build the tent? Allow 20% extra canvas for folding and stitching. (Take π = 22/7)

 A) 4714.43 sq m B) 3772.14 sq m C) 6783.86 sq m D) 2451.42 sq m

Explanation:

0 1
Q:

From a square plate with each side 7 cm, squares of area 0.25 sq. cm are cut out at each corner and the remaining plate is folded along the cuts to form a cuboid. The volume of this open-top cuboid will be ......... . cub.cm

 A) 21 B) 16 C) 18 D) 20

Explanation:

0 5
Q:

ABCD is a quadrilateral inscribed in a circle (radius = ). The bisectors of the angles DAB and BCD intersect the circle at X and Y, respectively. What is the length of the straight line XY?

 A) π (rxr) B) 2r C) (r + 2) D) π (rxr)/2

Explanation:

0 1
Q:

Find the curved surface area (in cm²) of a hemisphere of diameter 28 cm

 A) 1152 B) 1024 C) 956 D) 1232

Explanation:

1 60
Q:

Find the perimeter (in cm) of a semicircle of radius 28 cm.

 A) 288 B) 144 C) 121 D) 242

Explanation:

0 7
Q:

The area and the length of one of the diagonals of a rhombus is 84 cm² and 7 cm respectively. Find the length of its other diagonal (in cm).

 A) 12 B) 24 C) 48 D) 36

Explanation:

0 28
Q:

The length of the radius of the circumference of a triangle having sides 9 cm, 12 cm and 15 cm is

 A) 6 cm B) 7.5 cm C) 4.5 cm D) 8 cm