In flexibility method, a structure is converted to statically determinate form by removing:

The correct answer is B: Excess degree of indeterminacy. Flexibility method removes redundant reactions/members equal to degree of indeterminacy to create a primary determinate structure, then applies compatibility equations.

In plastic hinge formation, the condition for plastic collapse is:

The correct answer is C: Sufficient plastic hinges form to create mechanism. Plastic collapse occurs when sufficient plastic hinges develop to convert the structure into a mechanism, allowing unbounded deformation.

The principle of virtual work states that for equilibrium of a structure:

The correct answer is B: Sum of virtual work by all forces is zero. Principle of virtual work: For equilibrium, ΣδW = 0. Sum of virtual work by internal and external forces must be zero.

In plastic hinge analysis of a continuous beam, the number of plastic hinges formed before collapse for an n-span beam is:

The correct answer is B: n+1. For an n-span continuous beam, (n+1) plastic hinges are required to convert it into a mechanism and cause collapse.

A determinate truss with 12 members is analyzed using method of sections. The maximum number of members that can be cut in a single section is:

The correct answer is B: 3. In method of sections for trusses, we can cut maximum 3 members (one truss has 3 equilibrium equations: ΣFx=0, ΣFy=0, ΣM=0) to find member forces.

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Civil Engineering
Concrete Technology

Structures, surveying, soil mechanics

8 Q 2 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–8 of 8

Topics in Civil Engineering

All Structural Analysis 92 Concrete Technology 19

Q.1 Medium Concrete Technology

What is the recommended curing period for concrete in normal conditions?

A 3 days

B 7 days

C 14 days

D 28 days

Correct Answer: B. 7 days

EXPLANATION

IS 456:2000 recommends minimum 14 days of moist curing for normal Portland cement in normal temperature conditions.

Test

Q.2 Medium Concrete Technology

What is the effect of adding admixtures like retarders in concrete?

A Increases early strength

B Delays setting time

C Reduces water requirement

D Increases workability permanently

Correct Answer: B. Delays setting time

EXPLANATION

Retarders delay the setting time of concrete, allowing more time for placement and compaction in large structures.

Test

Q.3 Medium Concrete Technology

What is the typical strength gain pattern of concrete in the first 28 days?

A Linear growth throughout

B Rapid growth in first 7 days, then slower

C Slow initial growth, then rapid after 14 days

D Constant growth at all stages

Correct Answer: B. Rapid growth in first 7 days, then slower

EXPLANATION

Concrete gains approximately 40-50% strength in 7 days due to rapid hydration, then strength gain slows down gradually.

Test

Q.4 Medium Concrete Technology

Which of the following factors increases the compressive strength of concrete?

A Increase in water-cement ratio

B Decrease in curing time

C Use of pozzolanic materials

D Increase in slump value

Correct Answer: C. Use of pozzolanic materials

EXPLANATION

Pozzolanic materials like fly ash and silica fume react with calcium hydroxide to improve strength and durability.

Test

Q.5 Medium Concrete Technology

What is the minimum concrete cover for reinforcement in foundations as per IS 456:2000?

A 25 mm

B 40 mm

C 50 mm

D 75 mm

Correct Answer: C. 50 mm

EXPLANATION

IS 456:2000 specifies 50 mm minimum concrete cover for reinforcement in submerged/buried foundations.

Test

Q.6 Medium Concrete Technology

Hydration of cement produces which of the following as main products?

A Calcium Silicate Hydrate and Calcium Hydroxide

B Silicon Dioxide and Aluminum Oxide

C Iron Oxide and Magnesium Oxide

D Calcium Carbonate only

Correct Answer: A. Calcium Silicate Hydrate and Calcium Hydroxide

EXPLANATION

CSH (Calcium Silicate Hydrate) and CH (Calcium Hydroxide) are the main hydration products that give strength to concrete.

Test

Q.7 Medium Concrete Technology

What is the recommended slump for RCC columns according to IS 456:2000?

A 25-50 mm

B 50-100 mm

C 100-150 mm

D 150-200 mm

Correct Answer: A. 25-50 mm

EXPLANATION

For RCC columns, the recommended slump is 25-50 mm to ensure adequate compaction and workability.

Test

Q.8 Medium Concrete Technology

What is the water-cement ratio for M20 grade concrete as per IS 456:2000?

A 0.40

B 0.45

C 0.50

D 0.55

Correct Answer: D. 0.55

EXPLANATION

For M20 concrete, the maximum water-cement ratio is 0.55 to achieve the specified 28-day compressive strength.

Test

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