D61 CHECK YOUR LEVEL

Which compass measures angles with reference to magnetic meridian?

• Surveyor’s compass
• Dumpy level
• Theodolite
• Plane table

Answer explanation

Surveyor’s compass uses magnetic needle to measure bearing with respect to magnetic meridian.

In whole circle bearing system, bearings are measured from:

• South clockwise
• West anticlockwise
• North clockwise
• East anticlockwise

Answer explanation

WCB measures angle clockwise from North ranging from 0° to 360°.

Which level has internal compensator for automatic levelling?

• Dumpy level
• Auto level
• Tilting level
• Abney level

Answer explanation

Auto level has automatic compensator for horizontal line of sight.

What is the vertical distance between two contour lines called?

• Horizontal equivalent
• Contour spacing
• Contour gradient
• Contour interval

Answer explanation

Contour interval is the constant vertical difference between successive contour lines.

Which levelling method is used to determine reduced level of two distant points?

• Fly levelling
• Reciprocal levelling
• Simple levelling
• Check levelling

Answer explanation

Reciprocal levelling is used where long sighting across obstacles like rivers is required.

Which flooring material is best suited for hospitals and labs?

• Marble
• Granite
• Ceramic tiles
• Terrazzo

Answer explanation

Terrazzo floors are hygienic, smooth, and easy to maintain, ideal for hospitals.

What is the base layer for a ground floor called?

• Sub-base
• Hardcore
• Wearing surface
• Underlayment

Answer explanation

Hardcore layer is laid to stabilize soil before laying concrete floor base.

Which type of stair occupies least space?

• Dog-legged stair
• Open well stair
• Spiral stair
• Geometrical stair

Answer explanation

Spiral stairs require less space and are used where space is limited.

Which component of stair helps in vertical movement?

• Tread
• Riser
• Landing
• Baluster

Answer explanation

Risers are vertical elements allowing step-to-step vertical movement.

Which roof is suitable for large spans?

• Lean-to roof
• King post truss
• Gambrel roof
• Trussed roof

Answer explanation

Trussed roofs allow large span covering without internal supports.