Class 10 Exam  >  Class 10 Notes  >  Lab Manuals for Class 10  >  Viva Voce: Surface Area of a Sphere

Viva Voce: Surface Area of a Sphere | Lab Manuals for Class 10 PDF Download

Q.1. What is the curved surface area of a sphere of radius 3 cm ?

36π cm2


Q.2. What is the surface area of a sphere of diameter 14 cm ?

616 cm2


Q.3. What is the curved surface area of a sphere ?

4πr2


Q.4. How many hemispheres make a sphere ?

Two


Q.5. What is the radius of a hemisphere whose total surface area is 942 cm ? [Take 71 — 3.14]

10 cm


Q.6. What is the total surface area of a hemisphere ?

3πr2


Q.7. What is the curved surface area of a hemisphere ?

2πr2


Q.8. What is a hemisphere ?

Half of a sphere is called a hemisphere.


Q.9. If the radii of a sphere and base of a cylinder are same, then find the ratio of the curved surface area of sphere to curved surface area of the cylinder if height of the cylinder is 4 times of its radius.
(a) 2:1
(b) 1:2
(c) 1:4
(d) 4:1

Correct options is (b)


Q.10. A sphere of radius rhas the same volume as that of a cone with a circular base of radius r. Find the height of the cone.
(a) 2 r
(b) 4 r
(c)  3 r
(d) none of these

Correct options is (b)

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