# 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