The length of the wire of 0.2mm radius that can be drawn after melting a solid copper sphere of diameter 18cm?

Related Mcqs:

1. A metallic sphere of radius 12 cm is melted and drawn into a wire, whose radius of cross section is 16 cm. What is the length of the wire?

   A. 45 cm
   B. 18 cm
   C. 90 cm
   D. None of these

2. If a solid sphere of radius 10 cms is moulded into 8 spherical solid balls of equal radius, then surface area of each ball (in cm²) is________?

   A. 100π
   B. 7π
   C. 60π
   D. 50π

3. 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

4. The area of the largest circle that can be drawn inside a rectangle with sides 18cm and 14cm is_________?

   A. 49 Sq.cm
   B. 154 Sq.cm
   C. 378Sq.cm
   D. 1078 Sq.cm

5. 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

6. How many shots of 1cm radius can be prepared from a sphere of 3cm radius?

   A. 36
   B. 64
   C. 27
   D. 16

7. The radius of a wire is decreased to one –third if volume remains the same length will increase

   A. 1 Time
   B. 3 times
   C. 6 times
   D. 9 times

8. A wire in the form of a circle of radius 3.5 m is bent in the form of a rectangule, whose length and breadth are in the ratio of 6 : 5. What is the area of the rectangle?

   A. 60 cm2
   B. 30 cm2
   C. 45 cm2
   D. 15 cm2

9. The length of a rectangle is two – fifths of the radius of a circle. The radius of the circle is equal to the side of the square, whose area is 1225 sq.units. What is the area (in sq.units) of the rectangle if the rectangle if the breadth is 10 units?

   A. 140
   B. 156
   C. 175
   D. 214

10. A circle and a rectangle have the same perimeter. The sides of the rectangle are 18cm and 26cm.What is the area of the circle?

    A. 88cm²
    B. 154cm²
    C. 616cm²
    D. 1250cm²