The largest possible sphere is carved out of a wooden solid cube

Subject

Mathematics

Class

CBSE Class 10

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

11.

If the total surface area of a solid hemisphere is 462 cm2, find its volume.

Take π= 227


12.

Find the number of natural numbers between 101 and 999 which are divisible by both 2 and 5.


13.

Find the values of k for which the quadratic equation

9x2 - 3kx + k = 0 has equal roots.


14.

Solve for x:
   

16x - 1 = 15x+1;     x  0, -1


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 Multiple Choice QuestionsLong Answer Type

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15.

The largest possible sphere is carved out of a wooden solid cube of side 7 cm. Find the volume of the wood left. Use π =227


Diameter of sphere curved out = side of cube = 7 cm

 r=3.5 cmVolume of cube = a3                          = 73                          = 343 cm3Volume of sphere curved out = 43 π r3                                                = 43 x 227 x 72 x 72 x 72                                                = 179.66 cm3Volume of wood left = 343 - 179.66 = 163.34 cm3


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16.

Water in a canal, 6 m wide and 1.5 m deep, is flowing at a speed of 4 km/h. How much area will it irrigate in 10 minutes, if 8 cm of standing water is needed for irrigation?


17.

In Figure 2, ABCD is a trapezium of area 24.5 sq. cm. In it, AD|| BC,  DAB = 90°, AD = 10 cm and BC = 4 cm. If ABE is a quadrant of a circle, find the area of the shaded region.    Take π= 227                  

                     


18.

Find the ratio in which the line segment joining the points A(3,- 3) and B(- 2, 7) is divided by x-axis. Also find the coordinates of the point of division


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19.

The sum of the 2nd and the 7th terms of an AP is 30. If its 15th term is 1 less than twice its 8th term, find the AP.


20.

Draw a line segment AB of length 8 cm. Taking A as centre, draw a circle of radius 4 cm and taking B as centre, draw another circle of radius 3 cm. Construct tangents to each circle from the centre of the other circle.


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