`{:(,"Column A",,"Column B"),(12.,"If the area of a square field is 25 hectsares, then the sum of the length of the diagonals is _____.",(a),220),(13.,"A playgraound is in the shape of a rhombus whose diagonals are 10 m and 15 m. The costof levelling it at the of leelling it at the rate of Rs 12 per" m^(2) "is Rs. _____.",(b),1000),(14., "The volume of a cube of edge 10 cm in " cm^(3) "is _____.",(c ),900),(15.,"The length of the arc of a sector with angle" 60^(@) "and radius 210 cm is ______.",(d),1000sqrt(2)),(,,(e ),3000),(,,(f),500sqrt(2)):}`

`{:(,"Column A",,"Column B"),(12.,"If the area of a square field is 25

1.	`{:(,"Column A",,"Column B"),(12.,"If the area of a square field is 25 hectsares, then the sum of the length of the diagonals is _____.",(a),220),(13.,"A playgraound is in the shape of a rhombus whose diagonals are 10 m and 15 m. The costof levelling it at the of leelling it at the rate of Rs 12 per" m^(2) "is Rs. _____.",(b),1000),(14., "The volume of a cube of edge 10 cm in " cm^(3) "is _____.",(c ),900),(15.,"The length of the arc of a sector with angle" 60^(@) "and radius 210 cm is ______.",(d),1000sqrt(2)),(,,(e ),3000),(,,(f),500sqrt(2)):}`
Answer» Correct Answer - D 12. Option (d): Area of the square = 25 hectares = 250.000 `m^(2)`. Let a be the side of the square. `rArr a^(2)=250,000 rArr a = sqrt(250,000)=500` a = 500 m Length of the diagnoal = `sqrt2xxa` `=500sqrt2` Sum of the lengths of the diagonals `=500sqrt2+500sqrt2=1000sqrt2m` 13. Option (c): Area of the playground `=(1)/(3)xx10xx15` `=75m^(2)` `therefore" The cost of levelling "=75xx12=Rs.900` 14. Option (b) : Volume of a cube of edge, 10 cm = 1000 `cm^(3)` 15. Option (a) : Length of the arc of a sector `=(theta^(@))/(360^(@))xx2pir` `=(60^(@))/(360^(@))xx2(22)/(7)xx210` `=(1)/(6)xx2xx(22)/(7)xx210` 220 cm