Area And Volume - 3D Test

Result

Area And Volume - 3D Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The radius of a cylinder is doubled but its lateral surface area is unchanged. Then, how will its height be affected?

A
It becomes doubled.

B
It becomes halved.

C
It becomes tripled.

D
It remains constant.

Solution

Lateral Surface area of cylinder = 2 πrh
If the radius of cylinder is doubled then its height is halved to make the lateral surface area same.
Question 2
1 / -0

A hollow garden roller, 63 cm wide with a girth of 440 cm is made of iron of thickness 4 cm. The volume of the iron used is

A
56,372 cm³

B
107712 cm³

C
54,982 cm³

D
57,636 cm³

Solution

Circumference=girth =440cm
Outer radius =70 cm
inner radius =66 cm
Height =63 cm
Volume = 22/7(70²-66²)x63= 107712 cm³
Question 3
1 / -0

Vertical and horizontal cross-sections of a right circular cylinder are always ______ and ______ respectively.

A
rectangle, square

B
rectangle, circle

C
square, circle

D
rectangle, ellipse