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Class 9 Maths Practice Test: Surface Areas and Volumes - Surface Area of a Sphere
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Avg score: 0% • Most missed: “If surface area of a sphere of radius “R” is equal to curved surface area of a h…”

Surface area of the sphere = 4 π r2 , where “r” is the sphere's radius.

There are three types of surface area in solids: lateral surface area (LSA), curved surface area (CSA), and total surface area (TSA).

Class 9 Maths Practice Test: Surface Areas and Volumes - Surface Area of a Sphere
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8 Questions

1. Curved surface area of hemisphere of radius “r” is equal to __________
2. A hemispheric dome of radius 3.5m is to be painted at a rate of ₹600/m2. What is the cost of painting it? (Take π = \(\frac{22}{7}\))
3. Total surface are of a hemisphere of radius “r” is equal to __________
4. A sphere of radius “r” is fitted in a cylinder of height “h” such that the top of the sphere reaches only half the height of cylinder as shown in the figure. What is the ratio of curved surface area of a cylinder to surface area of a sphere?
maths-questions-answers-surface-area-sphere-q6
5. If surface area of a sphere of radius “R” is equal to curved surface area of a hemisphere of radius “r”, what is the ratio of R/r?
6. Surface area of a sphere of radius “r” is given by __________
7. A balloon’s radius increases 3 times when the air is pumped in it. If the surface area of the balloon after pumping the air is A2 and its surface area before pumping the air is A1, then what is the value of \(\frac{A_1}{A_2}\) ?
8. Total surface area of a hemisphere is 4158cm2, the diameter of the hemisphere is equal to __________ cm. (Take π = \(\frac{22}{7}\))

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