Conversion of 2D Shapes to 3D Objects

Q. Question 16
A right circular cylinder of radius r cm and height h cm (where, h>2r) just encloses a sphere of diameter.
(A) r cm
(B) 2r cm
(C) h cm
(D) 2 h cm

Q.

A cylindrical pencil sharpened at one edge is the combination of

1. Frustum of a cone and a cylinder

2. A hemisphere and a cylinder

3. A cone and a cylinder

4. Two cylinders

Q. 34. The height of the cone of maximum volume inscribed in a sphere of radius R is a)R/3. b)2R/3 c)4R/3 d)4R/3

Q.

The shape obtained when circles are stacked one above the other is:

1. Right circular cylinder

2. Cone

3. Hemisphere

4. Sphere

Q.

Question 2
A surahi is the combination of
(A) a sphere and a cylinder
(B) a hemisphere and a cylinder
(C) two hemispheres
(D) a cylinder and a cone

Q.

The area of the curved surface of a cylinder is $4400sq.cm$ and the circumference of its base is $110cm$. Find the height of the cylinder.

Q.

The figure obtained when a rectangular sheet is rolled up is

1. Cuboid

2. Cylinder

3. Cone

4. Frustrum

Q. In circle r is the distance between centre and circumference of circle.Then how we can imagine for r^2 and r^3 in terms of imagination as it is in solid angle s fomula .Also tell how we can imagine solid angle of value such as 270? etc.

Q. The curved surface area of a cylinder is 1, 650 $c{m}^2$. Its base has a circumference of 55 cm. The height of the cylinder is:

1. 15 cm
2. 30 cm
3. 40 cm
4. 55 cm

Q. Stacking _____ on top of each other forms a cylinder.

1. triangles
2. circles
3. squares
4. rectangles