Curioustab

Home » Aptitude » Volume and Surface Area

A sphere has the same curved surface area as a cone of vertical height 40 cm and radius 30 cm. The radius of the sphere is

5√5 cm
5√3 cm
5√15 cm
5√10 cm

Correct Answer: 5√15 cm

← Previous Question Next Question→

More Questions from Volume and Surface Area

Three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. What will be the percentage decrease in the surface area?
In triangle ABC, a line is drawn from the vertex A to a point D on BC. If BC = 9 cm and DC = 3 cm, then what is the ratio of the areas of triangle ABD and triangle ADC respectively?
PQR is a right angled triangle in which ∠R = 90°. If RS ⊥ PQ, PR = 3 cm and RQ = 4 cm, then what is the value of RS (in cm)?
In triangle PQR, A is the point of intersection of all the altitudes and B is the point of intersection of all the angle bisectors of the triangle. If ∠PBR =105°, then what is the value of ∠PAR (in degrees)?
If there are four lines in a plane, then what cannot be the number of points of intersection of these lines?
Three solid spheres have their radii r1, r2 and r3. The spheres are melted to form a solid sphere of bigger radius. Then the radius of the new sphere is
The amount of extension in a spring is proportional to the weight hung on it. If the weight of 5 kgs produces an extension of 0.4 cm, what weight would produce an extension of 5cm?
If an interior of a regular polygon is 170o, then the number of sides of the polygon is
If PA and PB are tangents to the circle with centre O such that ∠APB=50° , then the ∠OAB=
The length of two parallel sides of a trapezium are 18 m and 24 m. If its height is 12 m, then what is the area (in sq.m) of the trapezium?

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion