SA of combination of solids

The surface area of a sphere is 616 𝑐𝑚2 . Find its radius.

• 10 cm

• 8 cm

• 7 cm

• 5 cm

What geometrical shapes is a cylindrical “PENCIL” sharped at one edge combination of?

(a)  

Find total surface area of a solid hemi-sphere of radius 7cm

• 176 cm2

• 462 cm2

• 700 cm2

• 220 cm2

What is the total surface area of a cylinder with radius 𝑟 and height ℎ attached to a hemisphere of the same radius 𝑟 at its base?

• 
  2𝜋𝑟(𝑟+ℎ)

• 3πr2+πrh

• 4πr2+2πrh

• 3πr2+2πrh

What is the total surface area of a solid formed by a hemisphere of radius 𝑟 placed on a cube of side 𝑎 (where 𝑎=2𝑟)?

• 2πr2+6a2
  

• πr2+6a2
  

• 4πr2+6a2
  

• 5πr2+6a2

Statement A ( Assertion) : TSA of a top is calculated by adding the CSA of a hemisphere and the CSA of a cone.

Statement R ( Reason) : A top is obtained by joining the plane surfaces of a hemisphere and a cone.

• Both A and R are true, R is the correct explanation of A.

• Both A and R are true, R is not the correct explanation of A.

• A is true, R is false

• A is false, R is true

The curved surface area of a cone having height 24cm and radius 7cm is

• 528 cm2

• 1026 cm2

• 550 cm2

• 700 cm2

Curved Surface Area of a cylinder of height 5 cm is 94.2 cm2. Radius of the cylinder is ? ( Take π= 3.14)

• 2 cm

• 5 cm

• 2.8 cm

• 3 cm

What is the ratio of the lateral surface areas of 2 cylinders with equal height?

• H1:H2

• R1:R2

• 1:2

• 2:3

Calculate the lateral surface area of a cylinder with radius 3 cm and height 8 cm.

• 48π cm2

• 96π cm2

• 120π cm2

• 144π cm2