Q82 of 189 Page 512

The question consists of two statements, namely, Assertion (A) and Reason (R). Please select the correct answer.











Assertion (A)



Reason (R)



The curved surface area of a cone is and its diameter is 14 cm. Then, its slant height is 25 cm.



The curved surface area of a cone having base radius and slant height is


Curved surface area of a cone =



⇒ l=25 cm


Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).

More from this chapter

All 189 →
80

The question consists of two statements, namely, Assertion (A) and Reason (R). Please select the correct answer.











Assertion (A)



Reason (R)



The outer and inner radii of a hollow cylinder 2 m 10 cm long are 5 cm and 3 cm respectively. If it is made up of copper, then volume of copper in it is



The volume of a hollow cylinder of length external radius and internal radius is given by


81

The question consists of two statements, namely, Assertion (A) and Reason (R). Please select the correct answer.











Assertion (A)



Reason (R)



If the radius of a sphere is doubled then the ratio of the volume of the first sphere to that of the second is 1 : 8.



A cone and a hemisphere have equal bases and equal volumes. The ratio of their heights is 1 : 2.


 83

A right circular cylinder just encloses a sphere of radius (as shown in the figure). Then, the surface area of the sphere is equal to the curved surface area of the cylinder.

 84

The largest possible right circular cone is cut out of a cube of edge cm. The volume of the cone is