Common pool for D9

Which drawing instrument is used to draw large circles accurately?

• French curve
• T-square
• Beam compass
• Divider

Answer explanation

A beam compass is designed to draw large radius circles more precisely than standard compasses.

Which of the following scales is used for reducing the size of an object in a drawing?

• Full scale
• Isometric scale
• Reducing scale
• Enlarging scale

Answer explanation

Reducing scales are used to draw large objects on smaller sheets, keeping proportionality.

Which IS code specifies the proportions of ingredients in RCC mix design?

• IS 456
• IS 800
• IS 875
• IS 10262

Answer explanation

IS 10262 provides guidelines for concrete mix proportioning, essential for RCC work.

The process of increasing the strength of lime by storing it in a wet state is called:

• Tempering
• Slaking
• Curing
• Seasoning

Answer explanation

Slaking is the process where quick lime reacts with water to form hydrated lime, increasing its usability.

Which soil has the highest bearing capacity among the following?

• Black cotton soil
• Silty soil
• Clayey soil
• Rock

Answer explanation

Rock, especially hard rock, offers the highest bearing capacity and is ideal for heavy structures.

The water-cement ratio affects the:

• Strength of concrete
• Cost of cement
• Mixing time
• Slump test method

Answer explanation

Lower water-cement ratio increases strength; higher ratio improves workability but reduces strength.

Which of the following is a type of temporary structure used during construction?

• Staircase
• Scaffolding
• Lintel
• Beam

Answer explanation

Scaffolding is a temporary framework that supports workers and materials during construction.

The device used in chain surveying to hold arrows vertically is called:

• Plumb bob
• Cross staff
• Ranging rod
• Tripod

Answer explanation

Ranging rods are tall poles used to align survey points and ensure straight lines in chaining.

A 1:1000 scale drawing means:

• 1 mm on paper = 1000 mm on ground
• 1 cm on paper = 1 km on ground
• 1 m on paper = 1000 mm on ground
• 1000 cm on drawing = 1 cm on ground

Answer explanation

1:1000 means the object is scaled down 1000 times; so 1 mm represents 1000 mm (1 meter) in reality.

Which type of curve is preferred in railway engineering for gradual change in direction?

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

Answer explanation

Transition curves allow smooth entry and exit from curves by gradually changing curvature, reducing jerk.