NCERT Mathematics Class 9 Exemplar Ch 13 Surface Areas and Volumes Part 1
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Exercise 13.1
1. The radius of a sphere is, and then its volume will be
(A)
(B)
(C)
(D)
Answer: D
2. The total surface area of a cube is . The volume of the cube is:
(A)
(B)
(C)
(D)
Answer: C
3. A cone is 8.4 cm high and the radius of its base is . It is melted and recast into a sphere. The radius of the sphere is:
(A)
(B)
(C)
(D)
Answer: B
4. In a cylinder, radius is doubled and height is halved, curved surface area will be
(A) Halved
(B) Doubled
(C) Same
(D) four times
Answer: C
5. The total surface area of a cone whose radius is r/2 and slant height 2l is
(A)
(B)
(C)
(D)
Answer: B
6. The radii of two cylinders are in the ratio of 2:3 and their heights are in the ratio of The ratio of their volumes is:
(A)
(B)
(C)
(D)
Answer: B
7. The lateral surface area of a cube is The volume of the cube is
(A)
(B)
(C)
(D)
Answer: A