50 MCQs on RCC Structures for JKSSB JE SSC JE RRB JE Exam

byhomeacademy •يوليو 10, 2025

0

50 MCQs on RCC Structures by home academy

The primary binding material in concrete is:
- A. Fine aggregate
- B. Cement ✅
- C. Water
- D. Admixtures
The maximum size of coarse aggregate used in RCC is generally:
- A. 40 mm
- B. 20 mm ✅
- C. 50 mm
- D. 10 mm
Which compound in cement is responsible for early strength?
- A. C3S ✅
- B. C2S
- C. C3A
- D. C4AF
Water-cement ratio primarily affects:
- A. Setting time
- B. Workability
- C. Strength ✅
- D. Durability
Workability of concrete increases with:
- A. Decrease in W/C ratio
- B. Decrease in aggregate size
- C. Increase in water content ✅
- D. Decrease in cement content

Plasticizers are used to:
- A. Increase strength
- B. Reduce water content ✅
- C. Increase air content
- D. Reduce curing time
Accelerators are admixtures used to:
- A. Delay setting time
- B. Improve workability
- C. Speed up setting ✅
- D. Reduce shrinkage
Which admixture introduces air in concrete?
- A. Plasticizer
- B. Superplasticizer
- C. Air-entraining agent ✅
- D. Retarder
The main objective of concrete mix design is to:
- A. Reduce cost
- B. Achieve maximum strength ✅
- C. Increase water content
- D. Decrease setting time
M20 concrete has a characteristic compressive strength of:
- A. 15 MPa
- B. 20 MPa ✅
- C. 25 MPa
- D. 30 MPa

Which NDT method is used to determine compressive strength?
- A. Schmidt Rebound Hammer ✅
- B. Ultrasonic Pulse Velocity
- C. Core Cutting
- D. Half-cell Potentiometer
Ultrasonic Pulse Velocity Test is used for:
- A. Testing density
- B. Assessing concrete uniformity ✅
- C. Measuring W/C ratio
- D. Air content
Core cutting test is:
- A. Non-destructive
- B. Destructive ✅
- C. Semi-destructive
- D. Rapid test
The most widely used NDT instrument is:
- A. Core cutter
- B. Rebound hammer ✅
- C. Load cell
- D. Dial gauge
In Rebound Hammer Test, the rebound value is related to:
- A. Flexural strength
- B. Tensile strength
- C. Compressive strength ✅
- D. Modulus of elasticity

Working stress method is based on:
- A. Collapse load
- B. Ultimate strength
- C. Elastic theory ✅
- D. Safety margin
Limit state design ensures:
- A. No cracks
- B. No deflection
- C. Safety & serviceability ✅
- D. Higher cost
Partial safety factor for concrete in limit state design is:
- A. 1.0
- B. 1.2
- C. 1.5 ✅
- D. 2.0
The stress-strain curve for concrete is:
- A. Linear
- B. Parabolic ✅
- C. Exponential
- D. Constant
In working stress method, modular ratio is used to:
- A. Compare steel to cement
- B. Convert steel area to concrete area ✅
- C. Design reinforcement
- D. Calculate bond stress

In RCC beams, tension is taken by:
- A. Concrete
- B. Steel ✅
- C. Admixtures
- D. Water
Minimum grade of concrete for RCC as per IS 456 is:
- A. M10
- B. M15
- C. M20 ✅
- D. M25
Shear reinforcement is provided in the form of:
- A. Longitudinal bars
- B. Bent-up bars and stirrups ✅
- C. Mesh
- D. Slab
Main reinforcement in a column is provided along:
- A. Periphery ✅
- B. Center
- C. At bottom only
- D. Top only
In RCC beams, torsional reinforcement is:
- A. Only stirrups
- B. Only main bars
- C. Closed stirrups with longitudinal bars ✅
- D. Bent-up bars only

Prestressing in concrete is used to:
- A. Reduce cost
- B. Introduce tensile stresses
- C. Counteract tensile stresses ✅
- D. Increase dead load
Which method is used for pre-tensioning?
- A. Steam curing
- B. Wire wrapping
- C. Beds and moulds ✅
- D. Cement injection
Post-tensioning is usually done using:
- A. Anchor plates ✅
- B. Wooden pegs
- C. Bolts
- D. C-clamps
Prestressing reduces:
- A. Dead load
- B. Cracking ✅
- C. Shrinkage
- D. Bending
High-strength concrete in PSC is used to:
- A. Save money
- B. Avoid shrinkage
- C. Resist bursting forces ✅
- D. Reduce density

A slab is one-way if the ratio of longer to shorter span is:
- A. > 2 ✅
- B. < 2
- C. = 1
- D. None
Main reinforcement in one-way slab is provided:
- A. Along shorter span ✅
- B. Along longer span
- C. In both directions equally
- D. Diagonally
In two-way slabs, reinforcement is provided:
- A. Only in one direction
- B. Along longer span only
- C. In both directions ✅
- D. As mesh only
Minimum slab thickness for RCC floor slab is:
- A. 50 mm
- B. 75 mm
- C. 100 mm ✅
- D. 150 mm
Slab supported on all four sides is:
- A. One-way
- B. Cantilever
- C. Two-way ✅
- D. None

Minimum cover for RCC slab is:
- A. 10 mm
- B. 15 mm
- C. 20 mm ✅
- D. 25 mm
Lap length in tension zone is generally:
- A. 30 × diameter of bar ✅
- B. 10 × d
- C. 45 × d
- D. 20 × d
Development length is used to:
- A. Reduce cracks
- B. Ensure anchorage ✅
- C. Avoid shear
- D. Improve finish
Neutral axis in RCC beam divides:
- A. Tension & shear
- B. Compression & tension zones ✅
- C. Top & bottom
- D. Stress & strain
Bond between steel and concrete is due to:
- A. Gravity
- B. Adhesion & friction ✅
- C. Welding
- D. Anchors

IS code for plain and reinforced concrete is:
- A. IS 383
- B. IS 456 ✅
- C. IS 10262
- D. IS 800
IS 10262 is related to:
- A. Steel design
- B. Earthquake design
- C. Concrete mix design ✅
- D. Load combinations
Minimum steel in slab is:
- A. 0.1%
- B. 0.12% ✅
- C. 0.15%
- D. 0.2%
Maximum deflection allowed in RCC beam is:
- A. L/180
- B. L/200
- C. L/250 ✅
- D. L/300
Curing period of concrete as per IS 456 is minimum:
- A. 3 days
- B. 7 days
- C. 14 days ✅
- D. 28 days

Creep in concrete is:
- A. Shrinkage
- B. Permanent deformation under sustained load ✅
- C. Instant deflection
- D. Air content
Spalling of concrete is caused by:
- A. Excess cement
- B. Corrosion of reinforcement ✅
- C. Water leakage
- D. Cold joints
Bleeding in concrete is:
- A. Loss of cement
- B. Water coming out to surface ✅
- C. Dust rising
- D. Loss of heat
Segregation in concrete is:
- A. Uniform mix
- B. Separation of coarse aggregate ✅
- C. Water rising
- D. Slump loss
Slump test measures:
- A. Strength
- B. Durability
- C. Workability ✅
- D. Temperature