A. 100π
B. 7π
C. 60π
D. 50π
4/3 π * 10 * 10 * 10 = 8 * 4/3 πr3
r = 5
4π * 5 * 5 = 100π
Related Mcqs:
- The spherical ball of lead 3 cm in diameter is melted and recast into 3 spherical balls. The diameters of two of these are 1 ½ cm and 2 cm respectively. The diameter of third ball is?
A. 2.66 cm
B. 2.5 cm
C. 3 cm
D. 3.5 cm - Surface area of a sphere is 2464 cm2. If its radius is doubled, then the surface area of _________?the new sphere will be
A. 4920 cm2
B. 4727 cm2
C. 9856 cm2
D. 19712 cm2 - A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag?
A. ⁹C₂
B. ³C₂
C. ¹⁶C₂
D. ¹²C₂ - There are two identical red, two identical black, and two identical white balls.In how many different ways can the balls be placed in the cells (Each cell to contain one ball) shown above such that balls of the same colour do not occupy any two consecutive cells?
A. 15
B. 18
C. 24
D. 30 - On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:________?
A. Rs. 45
B. Rs. 50
C. Rs. 55
D. Rs. 60 - The dimensions of an open box are 52, 40 and 29 cms. Its thickness is 2 cms. If 1 cm3 of metal used in the box weighs 0.5 gms, the weight of the box is________?
A. 8.56 kg
B. 7.76 kg
C. 7.756 kg
D. 6.832 kg - The number of solid spheres each of diameter 6 cm, that could be moulded to form a solid metal cylinder of height 45 cm and diameter 4 cm is?
A. 3
B. 4
C. 5
D. 6 - The radius of a circular cylinder is the same as that of a sphere. Their volumes are equal. The height of the cylinder is________?
A. 4/3 times its radius
B. 2/3 times its radius
C. Equal to it’s radius
D. Equal to it’s diameter - How many shots of 1cm radius can be prepared from a sphere of 3cm radius?
A. 36
B. 64
C. 27
D. 16 - The length of the wire of 0.2mm radius that can be drawn after melting a solid copper sphere of diameter 18cm?
A. 24.3 m
B. 243 m
C. 2430 m
D. 24300 m
