a) 42.3215 cm b) 44.0123 cm c) 44.0625 cm d) 44.6023 cm Answer: c Explanation: External radius = 6 ...
View QuestionThe radius of a cylindrical cistern is 10 metres and its height is 15 metres. Initially the cistern is empty. We start filling the cistern with water through a pipe whose diameter is 50 cm. Water is coming out of the pipe with a velocity of 5 m/sec. How many minutes will it take in filling the cistern with water ?
a) 20 min b) 40 min c) 60 min d) 80 min Answer: d Explanation: Volume of cistern ...
View QuestionThe diameter of the base of a cylindrical drum is 35 dm and the height is 24 dm. It is full of kerosene. How many tins each of size 25 cm × 22 cm × 35 cm can be filled with kerosene from the drum ?
The diameter of the base of a cylindrical drum is 35 dm and the height is 24 dm. ...
View QuestionA 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 weights 8 g/cm^3, then the weight of the pipe is:
A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness ...
View Question66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
a) 84 meters b) 90 meters c) 168 meters d) 336 meters Answer: a Explanation: $$\eqalign{ & {\text{Let}}\,{\text{the}}\,{\text{length}}\,{\text{of}}\,{\text{the}}\,{\text{wire}}\,{\text{be h}} \cr & ...
View QuestionA hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
a) 720 m3 b) 900 m3 c) 1200 m3 d) 1800 m3 Answer: c Explanation: $$\eqalign{ & 2\left( {15 + ...
View QuestionIn 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 Answer: b ...
View QuestionA 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) 12$$\pi$$ cm3 b) 15$$\pi$$ cm3 c) 16$$\pi$$ cm3 d) 20$$\pi$$ cm3 Answer: a Explanation: ...
View QuestionHow many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?
How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build ...
View QuestionA large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
a) 2 : 1 b) 3 : 2 c) 25 : 18 d) 27 : 20 Answer: c Explanation: ...
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