D55 FACE THE CHALLENGE

Which drawing tool is used to sharpen the lead of drawing pencils?

• Clinograph
• Sandpaper block
• Mini drafter
• T-square

Answer explanation

Sandpaper blocks are used to maintain the pencil’s edge, especially for technical drawing.

Which component of a level holds the crosshairs?

• Eyepiece
• Tripod
• Diaphragm
• Bubble tube

Answer explanation

The diaphragm is where the crosshairs are fixed, allowing accurate staff reading.

Which AutoCAD command is used to mirror objects?

• TRIM
• MI
• RO
• OFFSET

Answer explanation

The 'MI' command in AutoCAD is used to create mirrored copies of objects.

Which polygon has a total internal angle sum of 1260°?

• Heptagon
• Nonagon
• Octagon
• Decagon

Answer explanation

A nonagon has 9 sides; sum of internal angles = (9–2)×180 = 1260°.

Which method is used in surveying to determine relative elevation of points?

• Chain surveying
• Tacheometry
• Levelling
• Plane table

Answer explanation

Levelling is specifically used to determine the relative heights or elevations of different points.

What is the expansion of CAD?

• Computerized Automated Drafting
• Computer Aided Design
• Centralized Aided Design
• Constructive Aided Drawing

Answer explanation

CAD stands for Computer Aided Design, widely used in engineering drafting.

What does 'spalling resistance' measure?

• Thermal expansion
• Heat capacity
• Resistance to temperature shocks
• Creep

Answer explanation

Spalling resistance is the ability of a material to resist failure under repeated temperature shocks.

Which pencil grade is best for detailed fine lines?

• HB
• 2H
• H
• 4H

Answer explanation

4H pencils are very hard and are used for precise, fine lines in technical drawings.

What is the primary function of a plumb line?

• Check inclination
• Set out angles
• Mark horizontal planes
• Check verticality

Answer explanation

A plumb line is used to check or define the vertical direction.

Which curve is used for drawing smooth symmetrical shapes?

• Ellipse
• Arc
• French Curve
• Circle

Answer explanation

French curves are templates used for drawing complex and smooth curves.