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Q: Which of the following statements is true? A. For instability, at least one joint of the structure should be able to displace without causing change in length of all the members. B. 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.
  • A. Only A
  • B. Only B
  • C. Both A and B
  • D. None of these
Correct Answer: Option B - Any structure is said to be unstable or instability prevails in a structural system if there is at least one joint of the structure is displacing without causing change in length of at least one of the members.
B. Any structure is said to be unstable or instability prevails in a structural system if there is at least one joint of the structure is displacing without causing change in length of at least one of the members.

Explanations:

Any structure is said to be unstable or instability prevails in a structural system if there is at least one joint of the structure is displacing without causing change in length of at least one of the members.