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Question

The degree of static indeterminacy of a rigid jointed frame PQR supported as shown is

A
zero
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B
unstable
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C
two
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D
one
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Solution

The correct option is B unstable
For general state of loading the structure is unstable. For example, if we apply a horizontal force on RQ the structure will become unstable. Upward force on QP also makes it unstable.

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