Volume and Surface Area of Solid Figures
- The length of the longest pole that can be placed in a room 12 m long and 9 m wide and 8 m high is ?
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Length of longer rod = √l2 + b2 + h2
= √122 + 92 + 82
Correct Option: C
Length of longer rod = √l2 + b2 + h2
= √122 + 92 + 82
= √144 + 81 + 64
= √289
= 17 m
- Find the height of the cylinder whose volume is 551 m3 and the area of the base is 36.5 m2. ?
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Volume of cylinder = πr2= Area base x height
Correct Option: C
Volume of cylinder = πr2= Area base x height
551 = 36.5 x h
h = 511/365 = 14 m
- What is the maximum number of pieces of 5cm x 5cm x 10 cm of cake that can be cut from a big cake of 5 cm x 30 cm x 30 cm size ?
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Maximum number of pieces that can be cut out
= (Volume of cake) / (Volume of Each piece of cake)Correct Option: C
Maximum number of pieces that can be cut out
= (Volume of cake) / (Volume of Each piece of cake)
= (5 x 30 x 30)/(5 x 5 x 10) = 18
- A box is of 10 cm long, 8 cm broad and 5 cm high. What is the longest possible length of a pencil that can be put in ?
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Since, the box is in the form of a cuboid.
∴ Required length = √102 +82 + 52 cm
Correct Option: C
Since, the box is in the form of a cuboid.
∴ Required length = √102 +82 + 52 cm
= √189
= √9 x 21
= 3√21 cm
- If the volumes of two cubes are in the ratio 8 : 1, the ratio of their edges, is ?
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Volume of new cube = [(5)3 + (4)3 + (3)3] cm3
Correct Option: A
Volume of new cube = [(5)3 + (4)3 + (3)3] cm3
= 216 cm3
Edge of this cube = ( 6 x 6 x 6)1/3 = 6 cm