Question : The radius of a wheel is 21 cm. What is the distance (in cm) travelled by the wheel in 10 revolutions?

Option 1: 660

Option 2: 1320

Option 3: 1980

Option 4: 2640

Question : What is the curved surface area (in cm²) of a cylinder having a radius of base as 14 cm and height as 10 cm?

Option 1: 440

Option 2: 880

Option 3: 220

Option 4: 1320

Question : A wheel has a diameter of 84 cm, then how far does the wheel go (in metres) in 16 revolutions? (Take $\pi=\frac{22}{7}$)

Option 1: 42.24

Option 2: 21.12

Option 3: 36.28

Option 4: 27.48

Question : If a wheel has a diameter of 42 cm, then how far does the wheel go (in metres) in 12 revolutions? (Take $\pi=\frac{22}{7}$)

Option 1: 21.45

Option 2: 23.27

Option 3: 15.84

Option 4: 17.64

Question : What is the radius of a normal cylinder whose height is 21 cm and curved surface area is 1386 cm²?

Option 1: 10.5 cm

Option 2: 3.5 cm

Option 3: 7 cm

Option 4: 10 cm