NCERT Mathematics Class 9 Exemplar Ch 13 Surface Areas and Volumes Part 2

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8. The number of planks of dimensions that can be stored in a pit which is long, wide and 4 m deep is

(A) 1900

(B) 1920

(C) 1800

(D) 1840

Answer: B

9. The length of the longest pole that can be put in a room of dimensions is

(A)

(B)

(C)

(D)

Answer: A

10. The radius of a hemispherical balloon increases from to as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is

(A)

(B)

(C)

(D)

Answer: A

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