D44 FACE THE CHALLENGE

Assertion (A): Buttress dams are suitable for wide valleys. Reason (R): They exert lesser pressure on the foundation due to open spacing.

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

Answer explanation

Buttress dams are efficient in wide valleys and exert lower foundation load due to thin sloping slabs.

Consider the following statements: 1. Piers resist lateral loads in bridges. 2. Bearings help transfer loads from deck to substructure. Which are correct?

• Only 1
• Only 2
• Both 1 and 2
• Neither 1 nor 2

Answer explanation

Piers and bearings both serve structural roles, both statements are correct.

Choose the correct statements: 1. RCC has higher compressive than tensile strength. 2. Concrete is ductile in nature.

• Only 1 is correct
• Only 2 is correct
• Both are correct
• Both are wrong

Answer explanation

Concrete is brittle, not ductile. Only statement 1 is correct.

The main factor influencing the creep of concrete is:

• Water-cement ratio
• Aggregate shape
• Curing period
• Load duration

Answer explanation

Creep increases with longer loading durations.

Which code gives standard bar bending schedules?

• IS 456
• IS 2502
• IS 800
• IS 383

Answer explanation

IS 2502 provides guidelines for bar bending schedules.

In two-way slab, corners are held down to resist:

• Bending
• Shear
• Torsion
• Crack

Answer explanation

Torsional reinforcement is provided at corners to prevent lifting.

Which of the following is NOT a method of curing?

• Ponding
• Steam curing
• Wrapping with gunny bags
• Guniting

Answer explanation

Guniting is a repair process, not curing.

What does 'initial setting time' of cement signify?

• Start of hydration
• End of setting
• Time to resist penetration
• Time to lose plasticity

Answer explanation

Initial setting time is when paste starts losing plasticity.

In chain surveying, the shortest chain used is:

• 10 m
• 20 m
• 30 m
• 5 m

Answer explanation

5 m chains are used for detailed, short surveys.

The term 'sag' in suspended cable bridges refers to:

• Vertical deflection
• Horizontal deviation
• Thermal expansion
• Support shift

Answer explanation

Sag is the vertical dip of cable between supports.