Surface Areas and Volumes-MCQ

Class IX Math
MCQ for Surface Areas and Volumes
1.   If the radius of cylinder is halved and height is doubled, then what will be the curved surface area?
        (a) increase by 1
(b) the same
(c) double
(d) triple
2.   What is the total surface area of a cone having radius and height 21?
        
3.   If a right circular cone hs radius 4 cm and slant height 5 cm then what is its volume?
        (a) 16 π cm3
(b) 14 π cm3
(c) 12 π cm3
(d) 18 π cm3
4.   The radius of a hemisphere is r. What is its volume?
        
5.   What is the total surface area of a hemisphere of radius r?
        (a) 4πr2
(b) πr2
(c) 2πr2
(d) 3πr2
6.   If the radius of a sphere is doubled, then what is the ratio of their surface area?
        (a) 1 : 2
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1
7.   Two right circular cones of equal curved surface areas have slant heights in the ratio of 3 : 5. Find the ratio of their radii.
        (a) 4 : 1
(b) 3 : 5
(c) 5 : 3
(d) 4 : 5
8.   In the cylindrical container, the base radius is 8 cm. If the height of the water level is 20 cm, find the volume of the water in the container.
        (a) 5.6721 l
(b) 4.0218 l
(c) 3.8925 l
(d) 4.97 l
9.   A well with 10 m inside diameter is dug 14m deep. Earth taken out of it is spread all around it to make an embankment of height Find the width of the embankment.
        (a) 5 m
(b) 4 m
(c) 4.3 m
(d) 6 m
Answers