D63 FACE THE CHALLENGE

What is the IS code that specifies the method for determining setting time of cement?

• IS 383
• IS 4031
• IS 516
• IS 800

Answer explanation

IS 4031 covers testing of cement properties including setting time.

Which measuring instrument provides least count up to 0.02 mm?

• Micrometer
• Vernier caliper
• Steel scale
• Dial gauge

Answer explanation

Vernier calipers measure up to 0.02 mm precision.

What is the typical batter (slope) provided in a trapezoidal retaining wall?

• 1:5
• 1:8
• 1:10
• Vertical face

Answer explanation

1:8 is standard batter slope to counter soil pressure.

Which device in leveling is used to check instrument horizontality?

• Spirit level
• Bubble tube
• Levelling screw
• Eyepiece

Answer explanation

Bubble tube helps keep instrument level during leveling.

Which of the following scales allows measurements with decimal precision?

• Chain scale
• Comparative scale
• Diagonal scale
• Vernier scale

Answer explanation

Diagonal scales offer higher precision using decimal subdivisions.

The spacing of stirrups in a beam is reduced near:

• Center of span
• Support region
• Mid-span
• Support of beam

Answer explanation

Stirrups are closely spaced at beam supports due to higher shear.

The property of cement to resist cracking due to heat of hydration is improved by:

• Increase gypsum content
• Reduce C3A
• Increase fineness
• Add C4AF

Answer explanation

Lowering C3A reduces cracking due to heat of hydration.

The method used to connect two wooden members at an angle is:

• Lap joint
• Mortise joint
• Finger joint
• Cross lap joint

Answer explanation

Mortise joints join wood at angles securely.

The edge distance for rivets in steel should not be less than:

• 1.5 times diameter
• 2.5 times diameter
• 2 × thickness
• 1 × thickness

Answer explanation

Edge distance should be ≥ 2.5 times rivet diameter to prevent tearing.

What is the best technique to increase tensile strength of RCC?

• Increase reinforcement area
• Use of stirrups
• Use mild steel
• Use high cement ratio

Answer explanation

Tensile strength improves by adding more longitudinal reinforcement.