1. In perspective projection, all lines of sight start at a ________ point.
a) double
b) triple
c) multiple
d) single
Explanation: When the human eye looks at a scene, objects in the distance appear smaller than objects close by. Orthographic projection ignores this effect to allow the creation of to-scale drawings for construction and engineering.
Orthographic projections are a small set of transforms often used to show profile, detail or precise measurements of a three dimensional object. Common names for orthographic projections include plane, cross-section, bird’s-eye, and elevation.
2. It is a vertical projection plane used to obtain the object’s Perspective is _______________
a) orthographic plane
b) vertical plane
c) perspective picture plane
d) horizontal plane
Explanation: Perspective in the graphic arts is an approximate representation, generally on a flat surface (such as paper), of an image as it is seen by the eye. The two most characteristic features of perspective are that objects are smaller as their distance from the observer increases; and that they are subject to foreshortening, meaning that an object’s dimensions along the line of sight are shorter than its dimensions across the line of sight.
3. It is a point at which the eyes of the observer are located. S and S’ indicated respectively the TV and FV of S is _____________
a) station point
b) piercing point
c) exit point
d) vanishing point
Explanation: A station point is location or vantage point from which an artist or exhibitor intends observer to experience an artwork.
In photography, the station point is the location of the camera at the point in time when the camera records a view to a recording medium.
4. It is the line drawn through the station point and perpendicular to the picture plane. It is also called axis of vision or line of sight or __________
a) Station point
b) X-axis
c) Perpendicular axis
d) Z-axis
Explanation: In a Cartesian coordinate system, the origin is the point where the axes of the system intersect. The origin divides each of these axes into two halves, a positive and a negative semi axis. Points can then be located with reference to the origin by giving their numerical coordinates—that is, the positions of their projections along each axis, either in the positive or negative direction. The coordinates of the origin are always all zero, for example (0,0) in two dimensions and (0,0,0) in three.
5. These are points at which the edges of the object appear to be converging. This point is seen at eye level, ie. on HP are __________
a) Station point
b) Piercing point
c) Exit point
d) Vanishing point
Explanation: In graphical perspective, a vanishing point is an abstract point on the image plane where 2D projections (or drawings) of a set of parallel lines in 3D space appear to converge. When the set of parallel lines is perpendicular to a picture plane, the construction is known as one-point perspective, and their vanishing point corresponds to the oculus, or “eye point”, from which the image should be viewed for correct perspective geometry. Traditional linear drawings use objects with one to three sets of parallels, defining one to three vanishing points.
6. The intersection point of visual rays with the PPP is ____________
a) penetrating point
b) piercing point
c) exit point
d) vanishing point
Explanation: The resulting perception is also known as visual perception, eyesight, sight, or vision (adjectival form: visual, optical, or ocular). The various physiological components involved in vision are referred to collectively as the visual system, and are the focus of much research in linguistics, psychology, cognitive science, neuroscience, and molecular biology, collectively referred to as vision science.
7. Which information is required to draw the perspective?
a) Top View and Front View (or Side View of) the object
b) Orientation and location of the object w.r.t the PPP
c) Location of station point S w.r.t to PPP and GL
d) Angle of projection
Explanation: Top View and Front View (or Side View of) the object. Since the PPP lies between the observer and the object, third angle projection technique is used. Orientation and location of the object w.r.t the PPP. Location of station point S w.r.t to PPP and GL.
Normal practice for location of S is at the normal to the eye level for big objects like buildings and for small objects s is located at such a height that all the three dimensions of the objects are almost visible.
8. In the ___________ method, the points on the perspective are obtained by projecting the top view with either the front view or the side view of the visual rays.
a) vector
b) concurrent
c) visual ray
d) straight line
Explanation: In the visual ray method, the points on the perspective are obtained by projecting the top view with either the front view or the side view of the visual rays.
9. A body consists of numerous particles on which the pull of the earth, i.e. the forces of gravity act. The resultant of these forces acts through point. This point is called the ________ of the body.
a) centroid
b) neutral axis
c) centre of gravity
d) gravity
Explanation: A point from which the weight of a body or system may be considered to act. In uniform gravity it is the same as the centre of mass.
10. When an area is symmetrical about both its axes, the centre of gravity will be at the __________ of these axes.
a) linear point
b) different point
c) collinear point
d) point of intersection
Explanation: Set the two equations for y equal to each other. Solve for x. This will be the x-coordinate for the point of intersection. Use this x-coordinate and plug it into either of the original equations for the lines and solve for y.