Which standard specifies the code of practice for plain and reinforced concrete in India?

The correct answer is B: IS 456:2000. IS 456:2000 is the Indian Standard for plain and reinforced concrete - Code of Practice.

The stiffness coefficient k₁₂ in a stiffness matrix represents:

The correct answer is B: Force at DOF 1 due to unit displacement at DOF 2. Stiffness coefficient k_ij represents the force/moment at DOF i due to unit displacement at DOF j. k₁₂ means effect at location 1 from displacement at location 2.

Which of the following statements about determinate structures is correct?

The correct answer is A: Number of unknowns equals number of equilibrium equations. A determinate structure has exactly as many unknowns as equilibrium equations, allowing unique solution without material properties.

For a 2D frame structure with 10 joints and 15 members, and assuming 3 reaction components, the degree of static indeterminacy is:

The correct answer is B: 3. DSI = (m + r) - 2j = (15 + 3) - 2(10) = 18 - 20 = -2. This indicates instability. Correct formula: DSI = m + r - 2j for 2D frame. If stable, use appropriate formula for actual configuration.

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

The correct answer is B: Rapid growth in first 7 days, then slower. Concrete gains approximately 40-50% strength in 7 days due to rapid hydration, then strength gain slows down gradually.

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Civil Engineering
Structural Analysis

Structures, surveying, soil mechanics

45 Q 2 Topics Take Mock Test

Difficulty: All Easy Medium Hard 41–45 of 45

Topics in Civil Engineering

All Structural Analysis 92 Concrete Technology 19

Q.41 Medium Structural Analysis

For a two-span continuous beam with equal spans and equal loads, which statement is true?

A Support moments are equal at both interior supports

B Reactions at all supports are equal

C Maximum positive BM occurs at center of each span

D Shear force diagram is symmetric about center

Correct Answer: A. Support moments are equal at both interior supports

EXPLANATION

For symmetric loading and equal spans, interior support moments are equal due to symmetry of structure and loading.

Test

Q.42 Medium Structural Analysis

For a propped cantilever beam, the number of reactions is:

A 2

B 3

C 4

D 5

Correct Answer: C. 4

EXPLANATION

Propped cantilever has: fixed end (3 reactions: vertical, horizontal, moment) + prop reaction (1) = 4 total reactions.

Test

Q.43 Medium Structural Analysis

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

A External work equals strain energy

B Sum of virtual work by all forces is zero

C Kinetic energy equals potential energy

D Deformation is maximum

Correct Answer: B. Sum of virtual work by all forces is zero

EXPLANATION

Principle of virtual work: For equilibrium, ΣδW = 0. Sum of virtual work by internal and external forces must be zero.

Test

Q.44 Medium Structural Analysis

In influence line diagram, what does the ordinate represent?

A Actual internal force value

B Coefficient of influence for unit load

C Deflection of structure

D Stress at section

Correct Answer: B. Coefficient of influence for unit load

EXPLANATION

Ordinate in influence line = coefficient showing magnitude of response at a fixed section per unit moving load.

Test

Q.45 Medium Structural Analysis

What is the degree of static indeterminacy for a fixed beam with one internal hinge?

A 1

B 2

C 3

D 4

Correct Answer: B. 2

EXPLANATION

Fixed beam has 3 reaction components. One internal hinge provides 1 additional equation (BM = 0). DI = 3 - 1 = 2

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