# Structural Analysis Questions and Answers – Deflection Diagrams and the Elastic Curve

This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Deflection Diagrams and the Elastic Curve”.

1. When a material returns to its undeformed original position after removal of load, then this behavior is called linear elastic material response.
State whether the above statement is true or false.
a) True
b) False

Explanation: We have considered structures which show linear elastic material response.

2. Which of the following causes greatest deflection for beams?
a) Internal axial force
b) Internal bending
c) Both causes equal deflections

Explanation: Internal bending causes greatest deflection for beam and frames.

3. In a truss, maximum deflection is caused by internal bending.
State whether the above statement is true or false
a) True
b) False

Explanation: Internal axial force causes most deflections in trusses.

4. In deflection diagrams, which of the following can’t have zero deflection in vertical direction?
a) Pin support
b) Roller support
c) Fixed support
d) Hinge

Explanation: Rest all can’t move from their initial positions as they all exert vertical force.

5. In deflection diagrams, which of the following can have zero angular deflection?
a) Pin support
b) Roller support
c) Fixed support
d) Hinge

Explanation: Only fixed support exerts moment at its point of contact.
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6. What is the relation between angular deflections between two legs connected by a fixed-connected joint?
a) They are unequal
b) They are equal
c) Can’t say
d) They don’t show angular deflection

Explanation: Since it is a fixed joint, they can’t have a relative angular deflection in between them.

7. What is the relation between angular deflections between two legs connected by a pin-connected joint?
a) They are unequal
b) They are equal
c) Can’t say
d) They don’t show angular deflection

Explanation: Since it is a pin joint, they can have a relative angular deflection in between them.

8. A positive moment by standard sign convention would bend a horizontal beam:-
a) Concave upward
b) Concave downward
c) Convex upward
d) Can’t say

Explanation: It is the same as used earlier. We can take reference from the earlier diagram also.

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