E-PolyLearning

1. A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:
a. 12π cm3
b. 15π cm3
c. 16π cm3
d. 20π cm3
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Answer: (a).12π cm3

2. In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
a. 75 cu. m
b. 750 cu. m
c. 7500 cu. m
d. 75000 cu. m
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Answer: (b).750 cu. m

3. A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
a. 720
b. 900
c. 1200
d. 1800
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Answer: (c).1200

4. 66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
a. 84
b. 90
c. 168
d. 336
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Answer: (a).84

5. A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:
a. 3.6 kg
b. 3.696 kg
c. 36 kg
d. 36.9 kg
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Answer: (b).3.696 kg

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