7.5 Conversion of Solids from one shape to another with no change in Volume · Part 4

C ) p cm ( D ) p cm . If two solid hemispheres of same base radius r units are joined together along their bases, then curved surface area of this new solid is ( A ) p r sq. units ( B ) p r sq. units ( C ) p r sq. units ( D ) p r sq. units . The height of a right circular cone whose radius is cm and slant height is cm will be ( A ) cm ( B ) cm ( C ) cm ( D ) cm . If the radius of the base of a right circular cylinder is halved keeping the same height, then the ratio of the volume of the cylinder thus obtained to the volume of original cylinder is ( A ) : ( B ) : ( C ) : ( D ) : . The total surface area of a cylinder whose radius is of its height is ( A ) p h sq.units ( B ) p h sq.units ( C ) p h sq.units ( D ) p h sq.units . In a hollow cylinder, the sum of the external and internal radii is cm and the width is cm. If its height is cm, the volume of the material in it is ( A ) p cm ( B ) p cm ( C ) p cm ( D ) p cm . If the radius of the base of a cone is tripled and the height is doubled then the volume is ( A ) made times ( B ) made times ( C ) made times ( D ) unchanged . The total surface area of a hemi-sphere is how much times the square of its radius. ( A ) π