D58 CHECK YOUR LEVEL

Assertion (A): Slump test is used to measure workability of concrete. Reason (R): Workability is the ease with which concrete can be mixed, transported, and placed.

• Both A and R are true, and R is the correct explanation of A
• Both A and R are true, but R is not the correct explanation of A
• A is true, R is false
• A is false, R is true

Answer explanation

Slump test directly assesses workability. Both statements are correct and related.

What is the minimum grade of concrete for RCC as per IS 456:2000?

• M15
• M20
• M25
• M10

Answer explanation

IS 456 mandates minimum M20 grade for RCC works due to strength requirements.

Which type of curve is used to connect two roads meeting at an acute angle?

• Simple curve
• Reverse curve
• Compound curve
• Transition curve

Answer explanation

Compound curves are ideal for sharp angles requiring smooth directional change.

Which among the following has the highest compressive strength?

• First class brick
• Granite
• Concrete
• Lime mortar

Answer explanation

Granite is a dense igneous rock known for very high compressive strength.

In theodolite, which part is used to measure horizontal angles?

• Telescope
• Lower plate
• Upper plate
• Vertical circle

Answer explanation

Upper plate rotates relative to lower plate and measures horizontal angles.

Which of the following is a 3D drawing command in AutoCAD?

• PLINE
• EXTRUDE
• TRIM
• FILLET

Answer explanation

EXTRUDE creates a 3D solid by stretching a 2D shape.

In compass surveying, which of the following is a local attraction?

• Magnetic declination
• Proximity to electric wires
• True meridian shift
• Variation due to time

Answer explanation

Nearby metallic/electric objects cause local attraction affecting compass readings.

In RCC design, modular ratio is defined as:

• Es / Ec
• Ec / Es
• fy / fck
• 1 + (Es/Ec)

Answer explanation

Modular ratio = Es/Ec (elasticity ratio of steel to concrete).

Which element in cement is responsible for the early strength gain?

• C3S
• C2S
• C3A
• C4AF

Answer explanation

Tricalcium silicate (C3S) hydrates quickly and gives early strength to cement.

Which part of the AutoCAD interface displays command history?

• Status bar
• Command line
• Ribbon
• Toolbar

Answer explanation

Command line logs previous commands and prompts for user input.