This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Projection of Spheres”.

1. ___________ surface is formed when a sphere is cut by a plane.

a) Ellipse

b) Parabola

c) Circle

d) Hyperbola

View Answer

Explanation: Sphere is a closed solid object which is formed by rotating semicircle about its flat side. Sphere gives top view, front view, side views as a circle whose radius is equal to the radius of a sphere.

2. When a hemisphere is placed on the ground on its flat face, its front view is a ___________

a) semi circle

b) circle

c) ellipse

d) irregular one

View Answer

Explanation: Hemisphere is solid formed by cutting the sphere at its middle. The flat surface of hemisphere will have section of circle with radius equal to radius of sphere. Here the hemisphere is placed on H.P on its flat surface so it gives semi circle from front view.

3. When a hemisphere is placed on the ground on its flat face, its top view is a ___________

a) semi circle

b) circle

c) ellipse

d) irregular one

View Answer

Explanation: Hemisphere is solid formed by cutting the sphere at its middle. The flat surface of hemisphere will have section of circle with radius equal to radius of sphere. Here the hemisphere is placed on H.P on its flat surface so it gives circle from top view.

4. When the flat face of hemisphere is inclined to the H.P or the ground and is perpendicular to the V.P, it is seen as __________(partly hidden) in the top view.

a) semi circle

b) circle

c) ellipse

d) irregular one

View Answer

Explanation: The flat surface of hemisphere will have section of circle with radius equal to radius of sphere. Here the hemisphere is placed on H.P so that its flat surface is inclined to H.P so it gives semi circle from front view and ellipse from top view.

5. When a hemisphere is placed on H.P such that the flat surface is perpendicular to V.P and inclined with horizontal then the front view will be ____________

a) semi circle

b) circle

c) ellipse

d) irregular one

View Answer

Explanation: The flat surface of hemisphere will have section of circle with radius equal to radius of sphere. Here the hemisphere is placed on H.P so that its flat surface is inclined to H.P so it gives semi circle from front view and ellipse from top view.

6. When two spheres of same radius are placed on H.P both are touching each other and the line joining the centers is perpendicular to V.P. The front view will be.

a) Single circle

b) Two circles

c) Concentric circles

d) Intersecting circles

View Answer

Explanation: Given two spheres of same radius are placed on H.P touching each other so as the spheres are placed on H.P the line joining the centers is parallel to H.P and given it is perpendicular to V.P so they both align in one line which gives single circle from front view.

7. When two spheres of same radius are placed on H.P both are touching each other and the line joining the centers is perpendicular to V.P. The top view will be _______________

a) single circle

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given two spheres of same radius are placed on H.P touching each other so as the spheres are placed on H.P the line joining the centers is parallel to H.P and given it is perpendicular to V.P so they both align in one line which gives two circles from top view.

8. When two spheres of same radius are placed on H.P both are touching each other and the line joining the centers is making 45 degrees to V.P. The front view will be _______________

a) single circle

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given two spheres of same radius are placed on H.P touching each other so as the spheres are placed on H.P the line joining the centers is parallel to H.P and given it is making 45 degrees with V.P so they both align in one line which gives intersecting circles from front view.

9. When two spheres of same radius are placed on H.P both are touching each other and the line joining the centers is making 45 degrees to V.P. The top view will be _____________

a) single circle

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given two spheres of same radius are placed on H.P touching each other so as the spheres are placed on H.P the line joining the centers is parallel to H.P and given it is making 45 degrees with V.P so they both align in one line which gives two circles in top view.

10. When two spheres of different radius are placed on H.P both are touching each other and the line joining the centers is perpendicular to V.P. The front view will be ____________

a) single circle

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given two spheres of different radius are placed on H.P touching each other, the line joining the centers is perpendicular to V.P so they both align in one line but due to a difference in radius it gives concentric circles from front view.

11. When two spheres of different radius are placed on H.P both are touching each other and the line joining the centers is perpendicular to V.P. The top view will be ______________

a) single circle

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given two spheres of different radius are placed on H.P touching each other, the line joining the centers is perpendicular to V.P so they both align in one line which gives two circles with different radius from top view.

12. Three spheres of same radius are placed on H.P such that the line joining centers is parallel to H.P and each one touching other two. The front view will be ____________

a) three circles

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given three spheres of same radius are placed on H.P each touching other two, the line joining centers of spheres gives equilateral triangle. From front view the spheres seem to be intersecting circles.

13. Three spheres of same radius are placed on H.P such that the line joining centers is parallel to H.P and each one touching other two. The top view will be ______________

a) three circles

b) two circles

c) concentric circles

d) intersecting circles

View Answer

Explanation: Given three spheres of same radius are placed on H.P each touching other two, the line joining centers of spheres gives equilateral triangle. From front view the spheres seem to be intersecting circles but from top three circles will be seen.

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