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Punjab PSEB Matric Mechanical Drawing and Painting study materials
Punjab PSEB Matric Mechanical Drawing and Painting study resources

Punjab PSEB Matric Mechanical Drawing and Painting practice questions

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Question 1Drawing instruments, materials and standard conventions

Which pencil grade is most suitable for drawing thin, light construction lines that must be easy to erase before final inking?

  1. 2B
  2. 6B
  3. 2H Correct answer.
  4. HB

Explanation

Harder grades such as 2H produce a faint, thin line that does not smudge and erases cleanly, which is exactly what construction geometry needs. Soft graphite grades deposit more carbon and smear under the eraser.

Question 2Drawing instruments, materials and standard conventions

In standard drawing practice, a 2H pencil is sharpened to a long conical point mainly because this shape:

  1. keeps the graphite tip firm while allowing the lead to be rotated for even wear Correct answer.
  2. makes the line appear thicker than one drawn with a chisel point
  3. prevents the pencil from marking tracing paper
  4. allows the pencil to be used as a compass needle

Explanation

A long conical point exposes plenty of lead so the draughtsman can twirl the pencil while drawing, spreading wear evenly and keeping line weight constant. It also keeps the tip supported so it does not snap under light pressure.

Question 3Drawing instruments, materials and standard conventions

A drawing sheet measures 420 mm by 297 mm. Which ISO A-series size is it?

  1. A5
  2. A3 Correct answer.
  3. A2
  4. A4

Explanation

The A series halves each successive size, so A0 is 841 x 1189 mm, A1 is 594 x 841 mm, A2 is 420 x 594 mm and A3 is 420 x 297 mm. A3 is therefore the sheet with a 420 mm long side and a 297 mm short side.

Question 4Drawing instruments, materials and standard conventions

On a standard drawing sheet, the title block is normally placed:

  1. centrally across the middle of the sheet
  2. on the reverse side of the sheet
  3. along the bottom right-hand corner of the frame Correct answer.
  4. along the top edge above the border

Explanation

Standard conventions place the title block in the bottom right corner so that it is found in the same place when sheets are folded and filed. It sits inside the drawing frame and carries the title, scale, sheet number and related data.

Question 5Drawing instruments, materials and standard conventions

Which instrument is used to draw circles of small radius that a standard bow compass cannot reach?

  1. Spring bow divider
  2. Set square
  3. French curve
  4. Bow compass Correct answer.

Explanation

A bow compass with an adjustable or drop-type centre leg can be set to very small radii and is used for tiny circles and arcs. Dividers merely transfer distances, and French curves and set squares do not draw circles at all.

Question 6Drawing instruments, materials and standard conventions

Which line type is used to show the hidden internal feature of an object in an orthographic view?

  1. Chain thin line
  2. Dashed line of short strokes Correct answer.
  3. Continuous thin line
  4. Continuous thick line

Explanation

Hidden edges and outlines are shown by a broken line made of short dashes, kept evenly spaced and of consistent length. Visible outlines use continuous thick lines, so the two are never confused.

Question 7Drawing instruments, materials and standard conventions

A drawing is made at a scale of 1:2. A feature measuring 45 mm on the drawing represents what actual length?

  1. 22.5 mm
  2. 45 mm
  3. 90 mm Correct answer.
  4. 135 mm

Explanation

A scale of 1:2 means one unit on the drawing equals two units on the object, so the drawing is half size. Multiplying the drawn length by the scale denominator gives 45 x 2 = 90 mm.

Question 8Drawing instruments, materials and standard conventions

An object 300 mm long is to be drawn on a sheet where only 150 mm of space is available. Which scale should be selected?

  1. 5:1
  2. 1:1
  3. 2:1
  4. 1:2 Correct answer.

Explanation

The drawn length must be smaller than the real object, which requires a reducing scale written with the drawing unit first. A scale of 1:2 gives 150 mm on paper for a 300 mm object, fitting the space exactly.

Question 9Drawing instruments, materials and standard conventions

Which grade of pencil is preferred for lettering and finishing outlines in a school drawing sheet?

  1. HB or H Correct answer.
  2. 3B
  3. 4H
  4. 6H

Explanation

Lettering and final outlines need a firm, dark but not smudgy line, which HB or H graphite provides. Very hard grades scratch the paper and give pale lines, while very soft grades smear and blur.

Question 10Drawing instruments, materials and standard conventions

When drawing a circle with a compass, the steel needle should be pressed slightly deeper than the lead point because:

  1. a deeper hole allows the compass to draw larger radii
  2. the compass can pivot without slipping while the lead just touches the paper Correct answer.
  3. the lead wears more slowly than the needle
  4. the needle then acts as a centre punch and removes the need for a template

Explanation

The needle must hold the centre firmly so the compass leg does not wander, while the lead needs only light contact to deposit graphite. This combination gives a true circle with a clean, unbroken line.

Question 11Drawing instruments, materials and standard conventions

Which combination of instruments is required to construct a regular hexagon by the set-square method?

  1. Compass and eraser shield only
  2. Protractor and bow divider only
  3. 30-60 set square, T-square and a 60 degree line reference Correct answer.
  4. 45 set square and a French curve only

Explanation

A hexagon has interior angles of 120 degrees, so its sides can be stepped off along lines drawn at 60 degrees using the 30-60 set square guided by a T-square. The 60 degree reference fixes the orientation of the sides.

Question 12Drawing instruments, materials and standard conventions

Which statement correctly distinguishes a divider from a compass?

  1. A divider draws circles and a compass measures lengths
  2. A divider is used only for inking and a compass only for pencil work
  3. A divider holds a lead and a compass has two needles
  4. A divider has two steel points and transfers distances, while a compass holds a lead for drawing arcs Correct answer.

Explanation

Both instruments share a hinged joint, but the divider carries two hardened points for stepping off or transferring measurements. The compass replaces one point with a lead or pen attachment so it can describe circles and arcs.

Question 13Drawing instruments, materials and standard conventions

Which line is drawn as a long dash alternating with a short dash and is used to indicate the axis of symmetry of a symmetrical part?

  1. Dashed hidden line
  2. Continuous thin line
  3. Continuous wavy line
  4. Chain thin line Correct answer.

Explanation

Centre lines and axes of symmetry are drawn with a chain thin line, that is, a long dash followed by a short dash in a repeating pattern. The pattern is kept uniform and extended slightly beyond the outline.

Question 14Drawing instruments, materials and standard conventions

In an orthographic drawing, a centre line is extended a short distance beyond the outline of the circle it marks. The main reason is to:

  1. mark the position of the dimension text
  2. indicate the direction of the cutting plane
  3. show the limit of the drawing frame
  4. show clearly that the line is a centre line and not part of the object outline Correct answer.

Explanation

Extending the chain line slightly past the feature makes it read unmistakably as a centre line rather than as an edge of the part. The overshoot is a small, consistent amount on both ends.

Question 15Drawing instruments, materials and standard conventions

A dimension of 40 mm is to be lettered on a drawing. Which placement follows standard convention?

  1. Written across the extension lines at the arrowheads
  2. Written below the dimension line and upside down
  3. Written above the dimension line and readable from the bottom or right of the sheet Correct answer.
  4. Written at an angle of 45 degrees to the dimension line

Explanation

Dimension figures are placed above the dimension line, centred on it, and oriented so they read from the bottom or from the right-hand side of the sheet. This keeps all text legible without turning the drawing.

Question 16Drawing instruments, materials and standard conventions

A drawing shows a part at a scale of 5:1. A dimension on the drawing reads 100 mm. What is the true size of the feature?

  1. 100 mm
  2. 25 mm
  3. 20 mm Correct answer.
  4. 500 mm

Explanation

An enlarging scale of 5:1 means the drawing is five times the object, so the true size is the drawn size divided by five. Dividing 100 mm by 5 gives 20 mm.

Question 17Drawing instruments, materials and standard conventions

A draughtsman must draw a series of parallel horizontal lines on a sheet pinned to a board. Which combination gives the most reliable result?

  1. T-square blade guided along the board edge with a set square sliding on the blade Correct answer.
  2. French curve held freehand against the sheet
  3. Protractor rotated for each line
  4. Bow divider stepped along the paper edge

Explanation

The T-square stock registers against the true edge of the drawing board so the blade stays horizontal, and a set square sliding along the blade produces accurate verticals and angled lines. This referencing to a fixed edge is what guarantees parallelism.

Question 18Drawing instruments, materials and standard conventions

Two candidates draw the same 1:1 view. One uses a 2H pencil for outlines and the other uses a 2B. Comparing the finished sheets, the 2B sheet is more likely to show:

  1. sharper corners because soft lead holds a fine point longer
  2. paler, scratched outlines that photocopy poorly
  3. smudged, variable-weight outlines that are harder to erase Correct answer.
  4. no difference, since both are graphite pencils

Explanation

Soft 2B graphite deposits heavily, blunts quickly and smears under the hand, so line weight varies and erasing leaves a grey shadow. Harder 2H lead holds a fine point and gives crisp, consistent outlines at full size.

Question 19Drawing instruments, materials and standard conventions

A drawing is to be reproduced and microfilmed, so line work must remain distinct after reduction. Which practice best supports this requirement?

  1. Omit centre lines to reduce visual clutter before reproduction
  2. Use a single medium line weight throughout to keep the drawing uniform
  3. Draw all lines with a soft 4B pencil for maximum contrast
  4. Vary line weights so visible outlines are thick and hidden or centre lines are thin Correct answer.

Explanation

Reproduction and microfilming compress fine detail, so contrast between line types must come from weight as well as pattern. Thick visible outlines against thin hidden, centre and dimension lines survive reduction and remain distinguishable.

Question 20Drawing instruments, materials and standard conventions

A candidate constructs an angle of 75 degrees using only a 30-60 set square and a 45 set square. Which combination of set-square angles produces the required angle?

  1. 60 degrees minus 30 degrees
  2. 45 degrees minus 30 degrees
  3. 45 degrees plus 30 degrees Correct answer.
  4. 60 degrees plus 45 degrees

Explanation

Set squares provide fixed angles of 30, 45, 60 and 90 degrees, and other angles are obtained by adding or subtracting these. Adding the 45 degree angle to the 30 degree angle gives 75 degrees directly.

Question 21Lettering, dimensioning and line work

According to the standard lettering practice followed in Punjab board drawing papers, the recommended ratio of height to width for capital letters in the vertical style is approximately:

  1. 4 : 7
  2. 7 : 4 Correct answer.
  3. 6 : 4
  4. 1 : 1

Explanation

Standard single-stroke vertical capital lettering uses a height-to-width proportion of about 7:4, giving letters a slightly narrow, upright appearance. This ratio keeps strokes uniform and spacing even across a drawing sheet.

Question 22Lettering, dimensioning and line work

In engineering drawing, the line used to show the imaginary cut surface in a sectioned view is the:

  1. Chain thin line Correct answer.
  2. Short dashes with long dashes
  3. Continuous thick line
  4. Continuous thin line

Explanation

A chain thin line (long dash followed by short dashes) is used for cutting planes and also for centre lines. Its distinctive pattern identifies an imaginary surface rather than a visible edge.

Question 23Lettering, dimensioning and line work

The dimension line in a drawing should normally be drawn:

  1. As a thick continuous line parallel to the surface being dimensioned
  2. As a chain line crossing the object outline
  3. As a thin continuous line parallel to the surface being dimensioned Correct answer.
  4. As a thin continuous line perpendicular to the surface being dimensioned

Explanation

Dimension lines are thin continuous lines drawn parallel to the dimensioned edge, with arrowheads at both ends touching the extension lines. Keeping them thin distinguishes dimensions from the thick outlines of the object.

Question 24Lettering, dimensioning and line work

The recommended height of numerals and letters in a drawing title block, where the main title is written, is generally:

  1. 3 mm
  2. 7 mm Correct answer.
  3. 2 mm
  4. 15 mm

Explanation

Main titles in a title block are lettered larger than ordinary notes, commonly about 7 mm high, so they stand out clearly. Smaller sizes such as 3 mm are used for general notes and dimensions.

Question 25Lettering, dimensioning and line work

Arrowheads used at the ends of dimension lines are normally drawn with a length-to-width ratio of about:

  1. 2 : 1
  2. 5 : 1
  3. 1 : 1
  4. 3 : 1 Correct answer.

Explanation

Standard arrowheads are drawn about three times as long as they are wide, giving a slender, clearly readable point. This proportion ensures the arrow tip touches the extension line precisely.

Question 26Lettering, dimensioning and line work

Which line type is used to indicate the centre of a circle in a mechanical drawing?

  1. Dotted line
  2. Continuous thick line
  3. Continuous thin line
  4. Chain thin line Correct answer.

Explanation

Centre lines are drawn as chain thin lines, consisting of long dashes alternating with short dashes, and they extend slightly beyond the circle. This pattern clearly distinguishes the centre from visible outlines.

Question 27Lettering, dimensioning and line work

A drawing shows a dimension written as 'R25'. This notation indicates:

  1. A radius of 25 units Correct answer.
  2. A tolerance of 25 units
  3. A diameter of 25 units
  4. A chamfer of 25 degrees

Explanation

The prefix R before a numeral denotes radius, so R25 means a radius of 25 units. Diameters are indicated by the symbol for diameter, not by R.

Question 28Lettering, dimensioning and line work

In a drawing, a dimension figure is placed above a horizontal dimension line. The figure should be written:

  1. Readable from the right-hand edge of the sheet
  2. Upright and readable from the bottom of the sheet Correct answer.
  3. Rotated to follow the dimension line direction
  4. Upside down so it reads from the top of the sheet

Explanation

Dimension figures on horizontal dimension lines are placed above the line and written upright so they read from the bottom of the drawing. This convention keeps all horizontal dimensions uniformly readable.

Question 29Lettering, dimensioning and line work

When a dimension is too small to fit between its extension lines, the accepted practice is to:

  1. Place the arrowheads outside the extension lines and extend the dimension line Correct answer.
  2. Omit the dimension entirely
  3. Reduce the size of the arrowheads to fit inside
  4. Write the dimension without any dimension line

Explanation

For small dimensions, the arrowheads are placed outside the extension lines pointing inward, and the dimension line is extended beyond them so the figure can be written. This keeps the dimension readable without distorting the arrowheads.

Question 30Lettering, dimensioning and line work

The hatching lines used to indicate a sectioned area are normally drawn:

  1. As thin continuous lines at 45 degrees to the principal outline Correct answer.
  2. As thick continuous lines at 90 degrees to the outline
  3. As chain lines parallel to the outline
  4. As freehand zigzag lines across the section

Explanation

Section hatching is drawn with thin continuous lines inclined at about 45 degrees to the main outlines of the part. Uniform spacing and angle make the cut area immediately recognisable.

Question 31Lettering, dimensioning and line work

In lettering, the term 'spacing' refers to the:

  1. Thickness of the stroke used for each letter
  2. Uniform gap maintained between adjacent letters and between words Correct answer.
  3. Angle at which the letters are inclined
  4. Height of the capital letters

Explanation

Spacing means the even gap kept between letters and between words so that the lettering looks balanced. Uneven spacing makes lettering look crowded or scattered even when individual letters are correct.

Question 32Lettering, dimensioning and line work

A note in a drawing reads '2 x 45°'. This note is used to specify:

  1. A radius of 2 mm
  2. A thread of 2 mm pitch
  3. A taper of 45 degrees over 2 mm
  4. A chamfer of 2 mm at 45 degrees Correct answer.

Explanation

The note '2 x 45 degrees' specifies a chamfer of 2 mm width cut at 45 degrees, typically on a corner or hole edge. This shorthand is widely used to avoid drawing the chamfer in detail.

Question 33Lettering, dimensioning and line work

The extension line in a dimensioned drawing should:

  1. Be drawn thicker than the visible outline
  2. Cross the entire object to the opposite side
  3. Touch the object outline exactly with no gap
  4. Start with a small gap from the object outline and extend slightly past the dimension line Correct answer.

Explanation

Extension lines begin with a small visible gap from the object and extend a little beyond the dimension line. The gap prevents confusion between the object outline and the extension line.

Question 34Lettering, dimensioning and line work

When dimensioning a cylinder in a single view, the accepted method is to show the diameter with the symbol for diameter followed by the value, and to:

  1. Omit the dimension because the shape is obvious
  2. Show the dimension as a radius instead of a diameter
  3. Use a leader line pointing to the cylindrical surface with the diameter note Correct answer.
  4. Draw two parallel dimension lines on either side of the cylinder

Explanation

A cylinder shown as a rectangle in one view is dimensioned with a leader line pointing to the surface and a diameter note, or with a dimension across the view marked with the diameter symbol. This avoids drawing unnecessary extra views.

Question 35Lettering, dimensioning and line work

Guide lines used for lettering on a drawing sheet are drawn as:

  1. Thick continuous lines that remain on the finished drawing
  2. Dashed lines showing stroke direction
  3. Chain lines marking the lettering zone
  4. Thin continuous lines that may be erased after lettering Correct answer.

Explanation

Guide lines for lettering are light thin continuous lines drawn to control letter height and baseline, and they are usually erased once lettering is complete. They should never dominate the finished sheet.

Question 36Lettering, dimensioning and line work

A candidate letters a title using single-stroke capitals. To keep the strokes uniform, the pencil should be:

  1. Tilted so the lead broadens the line at the centre
  2. Rotated continuously while drawing each stroke
  3. Held at a constant angle and moved steadily along the stroke Correct answer.
  4. Pressed hard at the start and lifted at the end

Explanation

Single-stroke lettering requires a constant pencil angle and a steady, even movement so every stroke has the same width. Rotating or varying pressure makes strokes uneven and spoils the uniform appearance.

Question 37Lettering, dimensioning and line work

In a drawing, a visible outline of a part and a hidden edge of the same part are shown. Which statement about their line weights is correct?

  1. Both are drawn with the same thick line
  2. Both are drawn as chain lines of equal weight
  3. The visible outline is thick continuous and the hidden edge is thin dashed Correct answer.
  4. The visible outline is thin dashed and the hidden edge is thick continuous

Explanation

Visible outlines use continuous thick lines, while hidden edges use dashed lines of thinner weight. The contrast in both pattern and weight lets the reader separate what is seen from what is concealed.

Question 38Lettering, dimensioning and line work

A drawing carries the dimension 40 with a tolerance written as plus 0.2 and minus 0.1. The maximum acceptable size of the part is:

  1. 40.2 Correct answer.
  2. 40.1
  3. 40.0
  4. 39.9

Explanation

The upper deviation is plus 0.2, so the maximum limit is 40 + 0.2 = 40.2. The lower deviation of minus 0.1 gives a minimum of 39.9, which is the smallest acceptable size, not the largest.

Question 39Lettering, dimensioning and line work

A dimension of 30 mm is to be shown on a drawing made to a scale of 1:2. The length of the dimension line drawn on the sheet should represent:

  1. 60 mm on the sheet, with the figure written as 30
  2. 15 mm on the sheet, with the figure written as 30 Correct answer.
  3. 15 mm on the sheet, with the figure written as 15
  4. 30 mm on the sheet, with the figure written as 30

Explanation

At a scale of 1:2 the drawing is half the true size, so a 30 mm feature is drawn 15 mm long on the sheet. Dimension figures always state the true size, so the figure remains 30.

Question 40Lettering, dimensioning and line work

A hole is dimensioned as diameter 20 with a leader pointing to it, and the same hole is also given a centre line. Which statement best explains why the centre line extends slightly beyond the circle?

  1. To show the direction of hatching
  2. To indicate the centre clearly so the hole can be located and marked during manufacture Correct answer.
  3. To show that the hole is threaded
  4. To replace the diameter dimension

Explanation

Centre lines extend a little past the circle so the exact centre is easy to locate and mark for drilling or machining. They are a locating aid, not a substitute for the diameter dimension.

Question 41Orthographic projection: points, lines and planes

In orthographic projection, a point lies 30 mm above the HP and 40 mm in front of the VP. In the front view, how far is the point's projection from the XY line, and on which side of it?

  1. 30 mm above XY Correct answer.
  2. 40 mm above XY
  3. 40 mm below XY
  4. 30 mm below XY

Explanation

The front view is obtained by projecting onto the VP, so the height above the HP becomes the distance above XY. The 40 mm distance in front of the VP controls the top view, not the front view. Hence the front view sits 30 mm above XY.

Question 42Orthographic projection: points, lines and planes

A point is situated in the first quadrant. Which statement correctly describes the positions of its two views relative to the XY line?

  1. Front view below XY and top view above XY
  2. Both views above XY
  3. Front view above XY and top view below XY Correct answer.
  4. Both views below XY

Explanation

In the first quadrant the point is above the HP and in front of the VP. Its front view therefore appears above XY and its top view appears below XY. This is the standard first-angle arrangement for a point in the first quadrant.

Question 43Orthographic projection: points, lines and planes

A point lies on the horizontal plane (HP) itself. What is the distinguishing feature of its front view?

  1. It coincides with the XY line Correct answer.
  2. It is drawn 10 mm above XY
  3. It lies at the VP
  4. It lies on the top view

Explanation

A point on the HP has zero height above the HP, so its front view falls exactly on XY. Its top view still shows the true distance in front of the VP. The coincidence with XY is the identifying feature.

Question 44Orthographic projection: points, lines and planes

The true length of a straight line is seen in the top view when the line is parallel to which plane and inclined to which other plane?

  1. Parallel to the profile plane only
  2. Parallel to the HP and inclined to the VP Correct answer.
  3. Parallel to the VP and inclined to the HP
  4. Perpendicular to both the HP and the VP

Explanation

The top view shows true length when the line is parallel to the HP, because no foreshortening occurs along the horizontal plane. Its inclination to the VP then appears as the true angle in the top view. The front view in that case is a foreshortened line parallel to XY.

Question 45Orthographic projection: points, lines and planes

A line is perpendicular to the HP. How do its two orthographic views appear?

  1. Front view a point, top view true length
  2. Both views points
  3. Front view true length, top view a point Correct answer.
  4. Both views true length

Explanation

A line perpendicular to the HP is parallel to the VP, so its front view shows the true length. Viewed from above, the line collapses to a single point. This point in the top view lies at the point where the line meets the HP.

Question 46Orthographic projection: points, lines and planes

A plane surface is parallel to the HP. Which view shows its true shape and size?

  1. Side view
  2. Front view
  3. Top view Correct answer.
  4. No view shows true shape

Explanation

A plane parallel to the HP is viewed normally from above, so its top view is its true shape. The front view collapses to a straight line parallel to XY. True shape appears only in the view taken perpendicular to the plane.

Question 47Orthographic projection: points, lines and planes

Which of the following best defines the reference line XY used in orthographic projection of points, lines and planes?

  1. The centre line of the drawing sheet
  2. The line joining the two views of a point
  3. The ground line of the object being drawn
  4. The line of intersection of the HP and the VP Correct answer.

Explanation

XY represents the intersection of the horizontal and vertical planes when they are unfolded into one plane. All heights are measured from XY in the front view and all depths from XY in the top view. The line joining two views of a point is a separate projector, perpendicular to XY.

Question 48Orthographic projection: points, lines and planes

In first-angle projection, where is the top view placed relative to the front view?

  1. To the right of the front view
  2. Above the front view
  3. To the left of the front view
  4. Below the front view Correct answer.

Explanation

In first-angle projection the object is imagined between the observer and the plane, so the view from above is projected onto the plane below the object. The top view is therefore drawn below the front view. This is the standard convention in Indian and Punjabi engineering drawing practice.

Question 49Orthographic projection: points, lines and planes

A line AB, 60 mm long, is parallel to both the HP and the VP. What length appears in each of its two views?

  1. Less than 60 mm in both views
  2. 60 mm in both views Correct answer.
  3. A point in both views
  4. 60 mm in the front view and less in the top view

Explanation

A line parallel to both planes is parallel to XY and is not foreshortened in either view. Both the front view and the top view show the true length of 60 mm. The two views are parallel to XY and separated by the line's distance from each plane.

Question 50Orthographic projection: points, lines and planes

A point is 25 mm below the HP and 20 mm behind the VP. Which quadrant does it occupy, and how are its views placed?

  1. Second quadrant; front view above XY, top view above XY
  2. Third quadrant; both views below XY Correct answer.
  3. First quadrant; front view above XY, top view below XY
  4. Fourth quadrant; front view below XY, top view below XY

Explanation

Being below the HP and behind the VP places the point in the third quadrant. In the unfolded layout, both the front view and the top view fall below XY. The front view is 25 mm below XY and the top view 20 mm below XY.