D47 FACE THE CHALLENGE

Which material property describes the ability to be drawn into wires?

• Malleability
• Toughness
• Ductility
• Elasticity

Answer explanation

Ductility refers to the ability of a material to deform under tensile stress, important for drawing into wires.

The type of compass where the readings are taken through a prism is:

• Surveyor’s compass
• Trough compass
• Tubular compass
• Prismatic compass

Answer explanation

In prismatic compass, readings are taken by viewing through a prism arrangement.

Unit of measurement for ‘Duty’ in direct irrigation is:

• Hectares/million m³
• Litres/sec
• Hectares/cumec
• Acres/cumec

Answer explanation

In direct irrigation, duty is expressed as hectares per cumec of discharge.

The ability of a material to regain its original shape after deformation is called:

• Plasticity
• Elasticity
• Toughness
• Resilience

Answer explanation

Elasticity is the ability to return to the original shape after load is removed.

Reinforced masonry is preferred over plain masonry because it:

• Looks better
• Is cheaper
• Can resist tensile stresses
• Is lighter

Answer explanation

Steel in reinforced masonry helps resist tensile stresses, unlike plain masonry.

Which property refers to a material's ability to absorb moisture from air?

• Porosity
• Hygroscopicity
• Permeability
• Absorption

Answer explanation

Hygroscopicity is the property of absorbing moisture from the air.

In compass surveying, local attraction is indicated when:

• BB and FB differ by 90°
• BB equals FB
• BB and FB differ by ≠180°
• Declination is high

Answer explanation

Local attraction causes the FB and BB to not differ exactly by 180°.

The bearing obtained from a magnetic meridian is known as:

• True bearing
• Arbitrary bearing
• Geographic bearing
• Magnetic bearing

Answer explanation

Magnetic bearing is measured from the magnetic meridian shown by the needle.

Plastic formwork is best suited for:

• High load-bearing structures
• Highly customized work
• Small repetitive works
• Large-scale concrete works

Answer explanation

Plastic formwork is used for small, repeatable work and is easy to clean.

Which survey is used for harbor and tidal studies?

• Land survey
• Hydrographic survey
• Astronomical survey
• Geological survey

Answer explanation

Hydrographic surveys deal with bodies of water including harbor works and tides.