11.

A box contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. The number of blue balls in the jar is

• 13

• 12

• 16

• 16

The population of a city is 250 thousand. It is increasing at the rate of 2% every year. The growth in the population after 2 years is

• 2500

• 10000

• 252000

• 252000

If a point (x, y) in a OXY plane is equidistant from (-1,1) and (4,3) then

• 10x+4y = 23

• 6x+4y = 23

• –x+y = 7

• –x+y = 7

Sum of first 15 multiples of 8 is

• 960

• 660

• 1200

• 1200

A rod of 2 cm diameter and 30 cm length is converted into a wire of 3 meter length of uniform thickness. The diameter of the wire is

• 2/10 cm

• 2/√10 cm

• 1/√10 cm

• 1/√10 cm

Two straight poles of unequal length stand upright on a ground. The length of the shorter pole is 10 meters. A pole joins the top of the two vertical poles. The distance between the two tops is 5 meters. The distance between the poles along the ground is 4 meter. The area thus formed by the three poles with the ground is

• 52 meter2

• 46 meter2

• 20 meter2

• 20 meter2

Pipe A can fill a tank in 10 hours and pipe B can fill the same tank in 12 hours. Both the pipes are opened to fill the tank and after 3 hours pipe A is closed. Pipe B will fill the remaining part of the tank in

• 5 hours

• 4 hours

• 5 hours 24 minutes

• 5 hours 24 minutes

A ground 100×80 meter2 has two cross roads in its middle. The road parallel to the length is 5 meter wide and the other road is 4 meter wide, both roads are perpendicular to each other. The cost of laying the bricks at the rate of Rs. 10 per m2, on the roads, will be

• Rs. 7000

• Rs. 8000

• Rs. 9000

• Rs. 9000

If selling price of 10 articles is equal to cost price of 11 articles, then gain is

• 8%

• 9%

• 8.5%

• 8.5%

Angles of a quadrilateral are in the ratio 3:4:5:8. The smallest angle is

• 54o

• 72o

• 36o

• 36o