21.

The factors of  are

• 

• 

• 

• 

Area of the triangle formed by the graph of the straight lines x - y = 0,  x + y = 2 and x-axis is 

• 1 sq unit

• 2 sq units

• 1 sq units

• None of these

The value of
 is

• 2

• 1

• -1

• 0

If 4x + 5y = 83 and 3x : 2y =  21 : 22, then (y - x) is

• 3

• 4

• 7

• 11

If x = 11, then the value of 
 is

• 5

• 10

• 15

• 20

If P = 99, then the value of 

• 10000000

• 9990000

• 999999

• 990000

Two chords of lengths a metre and b metre subtend angles 60° and 90° at the centre of the circle respectively, which of the following is true?

• a = √2 b

• b = √2 a

• a = 2b

• b = 2a

In a triangle ABC,
, then ∠B is

• 50°

• 80°

• 40°

• 60°

The radius of a circle is 6 cm. The distance of a point lying outside the circle from the centre is 10 cm. The length of the tangent drawn from the outside point to the circle is

• 5 cm

• 6 cm

• 7 cm

• 8 cm

If ABCD be a cyclic quadrilateral in which ∠A = 4x°, ∠B = 7x°, ∠C = 5y°, ∠D = y°, then x : y is 

• 3 : 4

• 4 : 3

• 5 : 4

• 4 : 5