Right Circular Cone and Its Surface Area

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 24 $\pi$
2. 12 $\pi$
3. 36 $\pi$
4. 48 $\pi$

Q. Total surface area of a right circular cylinder is 440 cm${}^2$. If the radius of the right circular cylinder is 7 cm, find the height of the right circular cylinder.

1. 5 cm
2. 3 cm
3. 2 cm
4. 7 cm

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 420 $c{m}^2$
2. 440 $c{m}^2$
3. 460 $c{m}^2$
4. 480 $c{m}^2$

Q.

Question 43

Curved surface area of a cylinder of radius h and height r is ___

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 440 $c{m}^2$
2. 460 $c{m}^2$
3. 420 $c{m}^2$
4. 480 $c{m}^2$

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 460 $c{m}^2$
2. 480 $c{m}^2$
3. 440 $c{m}^2$
4. 420 $c{m}^2$

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be four times the original curved surface area.

2. It will be twice the original curved surface area.

3. It will be half of the original curved surface area.

4. It will be same as the original curved surface area.

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 12 $\pi$
2. 24 $\pi$
3. 36 $\pi$
4. 48 $\pi$

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 420 $c{m}^2$
2. 440 $c{m}^2$
3. 460 $c{m}^2$
4. 480 $c{m}^2$

Q. The students of Byjus were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Byjus was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?

Q.

If the area of a circle with radius $r$ is equal to the curved surface area of a cone with radius $r_1$ and slant height l then the value of $r_1$ in terms of r and l is:

1. =

2. = rl

3. = rl

4. None of these

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 24 $\pi$
2. 48 $\pi$
3. 36 $\pi$
4. 12 $\pi$

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 24 $\pi$
2. 12 $\pi$
3. 36 $\pi$
4. 48 $\pi$

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be twice the original curved surface area.

2. It will be half of the original curved surface area.

3. It will be four times the original curved surface area.

4. It will be same as the original curved surface area.

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be twice the original curved surface area.

2. It will be same as the original curved surface area.

3. It will be four times the original curved surface area.

4. It will be half of the original curved surface area.

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 480 $c{m}^2$
2. 440 $c{m}^2$
3. 460 $c{m}^2$
4. 420 $c{m}^2$

Q. The minimum length in cm and correct to the nearest whole number of the thin metal sheet required to make a hollow and closed cylindrical box of diameter $20cm$ and height $35cm$. Given that the width of the metal sheet is $1m$, find the cost of the sheet at the rate of $56$ per m. Find the area of metal sheet required, if 10% of it is wasted in cutting, overlapping, etc.

1. True
2. False

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 440 $c{m}^2$
2. 480 $c{m}^2$
3. 420 $c{m}^2$
4. 460 $c{m}^2$

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 12 $\pi$
2. 48 $\pi$
3. 24 $\pi$
4. 36 $\pi$

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 36 $\pi$
2. 12 $\pi$
3. 48 $\pi$
4. 24 $\pi$

Q.

Question 35

The curved surface area of a cylinder is reduced by ___ percent if the height is half of the original height.

Q. The curved surface area of a cylinder with radius 3 cm and height 8 cm is equal to $c{m}^2$.

1. 48 $\pi$
2. 36 $\pi$
3. 12 $\pi$
4. 24 $\pi$

Q. The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

1. 480 $c{m}^2$
2. 420 $c{m}^2$
3. 440 $c{m}^2$
4. 460 $c{m}^2$

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be half of the original curved surface area.

2. It will be twice the original curved surface area.

3. It will be same as the original curved surface area.

4. It will be four times the original curved surface area.

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be same as the original curved surface area.

2. It will be half of the original curved surface area.

3. It will be twice the original curved surface area.

4. It will be four times the original curved surface area.

Q.

What will happen to the curved surface area of a cylinder if its radius is increased to twice the original value and height is reduced to half of the original value?

1. It will be same as the original curved surface area.

2. It will be four times the original curved surface area.

3. It will be half of the original curved surface area.

4. It will be twice the original curved surface area.