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प्रश्न
If the radius of the base of a right circular cylinder is halved, keeping the height the same, then the ratio of the volume of the cylinder thus obtained to the volume of original cylinder is:
विकल्प
1 : 2
2 : 1
1 : 4
4 : 1
उत्तर
Let the radius and height of the original cylinder be r and h respectively.
∴Volume of the original cylinder = πr2h
According to the question, radius of the new cylinder is halved keeping the height same.
⇒ Radius of the new cylinder`=r/2`
Also, height of the new cylinder = h
∴ Volume of the new cylinder `pi(r/2)^2h=(pir^2h)/4`
`\text{Volume of the new cylinder}/\text{Volume of original cylinder}=(((pir^2h)/4))/(r^2h4)=underline1=1:4`
Hence, the correct answer is C.
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Khurja is a city in the Indian state of Uttar Pradesh famous for the pottery. Khurja pottery is traditional Indian pottery work which has attracted Indians as well as foreigners with a variety of tea sets, crockery and ceramic tile works. A huge portion of the ceramics used in the country is supplied by Khurja and is also referred as "The Ceramic Town". One of the private schools of Bulandshahr organised an Educational Tour for class 10 students to Khurja. Students were very excited about the trip. Following are the few pottery objects of Khurja.
Students found the shapes of the objects very interesting and they could easily relate them with mathematical shapes viz sphere, hemisphere, cylinder etc. |
Maths teacher who was accompanying the students asked the following questions:
- The internal radius of hemispherical bowl (filled completely with water) in I is 9 cm and the radius and height of the cylindrical jar in II are 1.5 cm and 4 cm respectively. If the hemispherical bowl is to be emptied in cylindrical jars, then how many cylindrical jars are required?
- If in the cylindrical jar full of water, a conical funnel of the same height and same diameter is immersed, then how much water will flow out of the jar?
3 cubes each of 8 cm edge are joined end to end. Find the total surface area of the cuboid.
