D44 MASTER THE DAY

Which method of levelling is preferred when precision is not required?

• Fly levelling
• Check levelling
• Barometric levelling
• Reciprocal levelling

Answer explanation

Barometric levelling is an approximate method used when precision is not required.

Which instrument part is responsible for supporting the level on ground?

• Tripod
• Eyepiece
• Diaphragm
• Level tube

Answer explanation

Tripod stand is used to support and stabilize the instrument on ground.

Which error occurs due to incorrect graduation of the staff?

• Natural error
• Instrumental error
• Personal error
• Observation error

Answer explanation

Incorrect graduation on the staff is an instrumental error.

Which surface is perpendicular to the plumb line at all points?

• Vertical surface
• Datum
• Level surface
• Horizontal surface

Answer explanation

Level surface is perpendicular to the plumb line at all points.

What is the function of the diaphragm in a level?

• Holds objective lens
• Holds cross hairs
• Supports eyepiece
• Holds level tube

Answer explanation

The diaphragm holds the cross hairs for accurate sighting.

Which levelling staff type is most suitable for high precision work?

• Folding staff
• Invar staff
• Self-reading staff
• Target staff

Answer explanation

Invar staff is highly accurate and used for precise levelling works.

Which method is used to check accuracy of previously established levels?

• Check levelling
• Profile levelling
• Differential levelling
• Simple levelling

Answer explanation

Check levelling is done to verify the accuracy of earlier established RLs.

Which part of level contains the bubble for horizontal adjustment?

• Eyepiece
• Objective lens
• Level tube
• Diaphragm

Answer explanation

Level tube contains the bubble and is used for horizontal adjustment.

Which type of levelling is used for long alignments like roads?

• Simple levelling
• Check levelling
• Profile levelling
• Fly levelling

Answer explanation

Profile levelling is used to determine elevation along long alignments like roads and railways.

What is the least count of a typical self-reading staff?

• 1 mm
• 5 mm
• 10 mm
• 0.5 mm

Answer explanation

The least count of self-reading levelling staff is typically 5 mm.