This set of Aptitude Questions and Answers (MCQs) focuses on “Cylinder”.

1. Which of the following is the correct expression for the volume of a cyclinder?

a) πrh^{2}

b) 4πr^{2}h

c) πr^{2}h

d) 2πrh

View Answer

Explanation: Let the radius = r, height = h.

The correct formula for the volume of a cylinder = πr

^{2}h.

2. If the radius of a cylinder is 7 cm and height is 10 cm then, what will be the volume (in cubic cm) of this cylinder?

a) 1540

b) 1690

c) 1850

d) 1270

View Answer

Explanation: Given,

r = 7 cm, h = 10 cm

Volume of cylinder = πr

^{2}h

= (22 / 7) * (7)

^{2}* 10

= 1540 cm

^{3}

3. The diameter of cylinder is 14 cm and the height is 20 cm. What will be the volume of this cylinder?

a) 3650 cm^{3}

b) 3080 cm^{3}

c) 3270 cm^{3}

d) 3640 cm^{3}

View Answer

Explanation: Given,

d = 14 cm, h = 20 cm

r = d / 2 = 14 / 2 = 7 cm

Volume = πr

^{2}h

= (22 / 7) * (7)

^{2}* 20

= 3080 cm

^{3}

4. A large cylindrical vessel has a radius of 10 m and height of 14 m. How much will this vessel hold in liters when it is half filled?

a) 2200000

b) 4400000

c) 3400000

d) 4200000

View Answer

Explanation: Given,

r = 10 m, h = 14 m

Volume of vessel = πr

^{2}h

= (22 / 7) * (10)

^{2}* (14)

= 4400 m

^{3}

Half volume = (1 / 2) * 4400 m

^{3}

= 2200 m

^{3}

1m

^{3}= 1000L

Half volume in L = (2200) * 1000

= 2200000 L

5. If the volume of a cylinder is 1000cm^{3} with the height of 7cm then what will be the radius of this cylinder?

a) 7.33 cm

b) 5.93 cm

c) 6.74 cm

d) 5.19 cm

View Answer

Explanation: Given,

Volume = 1000cm

^{3}, h = 7cm

Let the radius be r cm.

Volume = πr

^{2}h

➩ 1000 = (22 / 7) * r

^{2}* 7

➩ 1000 = 22 * r

^{2}

➩ 1000 / 22 = r

^{2}

➩ 6.74 cm = r

6. Which of the following is the correct option related to the curved surface area of a cylinder?

a) 3πrh

b) 4πrh

c) πr^{2}h

d) 2πrh

View Answer

Explanation: Let the radius = r, height = h.

The correct formula for the curved surface area of a cylinder = 2πrh.

7. If the radius of a cylindrical vessel is 5 cm and height is 7 cm then what will be the curved surface area (in sq. cm) of this vessel?

a) 220

b) 250

c) 205

d) 225

View Answer

Explanation: Given,

r = 5 cm, h = 7 cm

Curved surface area = 2πrh

= 2 * (22 / 7) * 5 * 7

= 220 cm

^{2}

8. If the curved surface area and volume of a cylindrical vessel are equal, then what will be the radius of this vessel?

a) 6 units

b) 1 unit

c) 2 units

d) 4 units

View Answer

Explanation: Let the radius = r, height = h.

According to the question,

Volume = Curved surface area

πr

^{2}h = 2πrh

r = 2 units

9. Which of the following is the correct option representing the total surface area of a completely closed cylinder?

a) πrh + 2πr^{2}

b) 2πrh + 2πr^{2}

c) 2πrh + πr^{2}

d) πrh + πr^{2}

View Answer

Explanation: Let the radius = r, height = h

Total surface area of a cylinder = 2πrh + 2πr

^{2}.

10. What will be the curved surface area of a cylinder as compared to the original cylinder if its radius is doubled and height is halved?

a) Same

b) Doubled

c) Halved

d) Tripled

View Answer

Explanation: Let the radius of original cylinder = r, height = h

Curved surface area of original cylinder = 2πrh

Radius of new cylinder = 2r, height = h / 2

Curved surface area of new cylinder = 2π * (2r) * (h / 2)

= 2πrh

Thus, original curved surface area = new curved surface area.

To practice all aptitude questions, please visit “1000+ Quantitative Aptitude Questions”, “1000+ Logical Reasoning Questions”, and “Data Interpretation Questions”.