# Structural Analysis Questions and Answers – Idealized Structure

This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Idealized Structure”.

1. How many constraints are there in a fixed support?
a) 2
b) 3
c) 6
d) Can’t say

Explanation: It is not mentioned in the question that whether the fixed support is used in planar system (3 constraints) or in 3D system (6 constraints).

2. How many constraints are there in a free-rotation support used in a planar system?
a) 1
b) 2
c) 3
d) 4

Explanation: There are 2 constraints, reaction in x and y direction. Rotation is allowed as the name implies.

3. If we use a link support in a structural system, then how many unknowns would we have?
a) 0
b) 1
c) 2
d) None of the mentioned

Explanation: There will always be only 1 unknown if link support is used and that is the force acting along the axis of the link.

4. Moment at a hinge will be:-
a) Infinity
b) Zero
c) Depends upon acting forces
d) Can’t say

Explanation: Only shear forces act in the case of hinge.

5. Concrete is:-
a) Good in compression, good in tension
b) Good in compression, weak in tension
c) Weak in compression, weak in tension
d) Weak in compression, good in tension

Explanation: Concrete consists of aggregates and they are good in carrying compression. But, during tension joint between cement and aggregate cracks resulting in inefficiency.
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6. Why are steel reinforcing rods used in concrete beams:-
a) To make it carry compression
b) To make it carry tension
c) To make it carry compression as well as tension
d) None of the mentioned

Explanation: Concrete is weak in carrying tension, but is good in compression.

7. A surface structure has:-
a) Small thickness
b) Large thickness
c) Moderate thickness
d) Arbit thickness

Explanation: They support very little bending. So, to minmize I(flexural rigidity), thickness is small.

8. For instability, at least one joint of the structure should be able to displace without causing change in length of all the members.
State whether the above statement is true or false.
a) true
b) false

Explanation: For instability, at least one joint of the structure should be able to displace without causing change in length of at least one of the members.

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