Question

2. Two circles have radii r & 2r respectively. Their circumferences differ by 3 π cm . Then r is,
(a) 4 cm (b) 1cm (c) 3cm (d) 1.5 cm

3. p = 1.6+9.6power 2/5.9-4.3when each number is rounded off to 1 significant figure, an estimate for p is,
(a) 10 (b) 5.5 (c) 41 (d) 51

4. Point A has coordinates (1/2 , -2) and point B has coordinates( 1/4, 4) , the mid- point of AAB has coordinates,
(a) ( 3/4, 1) (b) (1,1) (c) (3/8 , 2) (d) (3/8 , 1)

5. A drink is made by mixing fruit juice and water in the ratio 3:5.
What is the percentage of water in 800ml of drink?
(a) 5 (b) 500 (c) 8 (d) 62.5

11. When the side of a square is increased by 10% , its area is increased by ,
(a) 20% (b) 40 % (c) 21% (d) 5%

Answer 1

Answer:

2------ B

Step-by-step explanation:

Answer 2

Answer:

1. circumference difference by 3π

then,

2π(2r)-2πr=3π

4πr-2πr=3π

2πr=3π

2r=3

r=3/2

r=1.5 cm

So, option D is the correct answer