Class X

In the given diagram of semicircle,0 is centre. The arera of shaded portion is
  1. 96cm²
  2. 19.2cm²
  3. 62cm²
  4. 61.1cm²
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
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
The Line 4x-3y+12=0 meets x-axis at A. The co-ordinates of A are
  1. (4,0)
  2. (4,3)
  3. (-3,0)
  4. (3,12)
The angle of elevation of a hill at the foot of the tower is 650ᵒ and the angle of elevation of top of the tower from the foot of the hill is 30ᵒ.If the tower is 20 m high,then the hight of the hill is
  1. 60m
  2. 40m
  3. 80m
  4. 30m
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