Class VII

A cone has a circular base of radius 6m and volume 84π m3. height of cone is
  1. 7m
  2. 6m
  3. 8m
  4. 8m
A solid with a vertex and a base that is formed by a simple closed curve is a
  1. A solid with a vertex and a base that is formed by a simple closed curve is a
  2. Cone
  3. Pyramid
  4. Dice
. VPQRS is rectangle based pyramid where PQ = 30cm, QR = 20cm and volume is 2000cm3, height is
  1. 20cm
  2. 40cm
  3. 10cm
  4. 30cm
. Surface area of sphere is
  1. 2πr
  2. 4πr2
  3. 2πr2
  4. 6πr2
. Volume of sphere is
  1. (4/3)πr3
  2. 3⁄4rl
  3. 3.414ra
  4. None of above
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