Class X

A rectangular tin foil of size 22 cm by 16 cm is wrapped around to form a cylinder of hight 16 cm .The volum of cylinder is
  1. 616 cm³
  2. 416 cm³
  3. 308 cm ³
  4. 832 cm³
. If ∠A=30ᵒ,then the value of Sec^2 A-Tan^2 A is
  1. 0
  2. -1
  3. 2
  4. 1
a chord of length 24 cm is at a distance of 5 cm from the centre of the circle.The length of the chord of the same circle which is at a distance of 12 cm from thbe center is
  1. 12 cm
  2. 10 cm
  3. 5 cm
  4. 24 cm
A chord of length 24 cm is at a distance of 5 cm from the centre of a circle. The length of the chord of the same circle which is at a distance of 12cm from the centre is ?
  1. 12 cm
  2. 10 cm
  3. 5 cm
  4. 24 cm
A cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 11.2 cm and its length is 21cm. If the metal thickness is 0.4 cm ,then the volum of metal will be
  1. 2067.87 cm³
  2. 306.24 cm³
  3. 1922.81 cm³
  4. 1033.94 cm³
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