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A pin-jointed plane frame is unstable if, (where m is number of members, r is reaction components and j is number of joints)

• (m + r) < 2j
• m + r = 2j
• (m + r) > 2j
• none of the above

The deformation of a spring produced by a unit load is called

• Stiffness
• Flexibility
• Influence coefficient
• Unit strain

The force per unit displacement is called as

• Stiffness
• Flexibility
• Influence coefficient
• Unit strain

In the flexibility method of structural analysis, the primary unknowns are

• Displacements
• Displacements and forces
• Force
• none of the above

Which of the following methods of structural analysis is a displacement method?

• Moment distribution method
• Column analogy method
• Three moment equation
• All

If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by

• m + r + 2j
• m + r - 2j
• m + r - 3j
• m - r + 2j

Number of unknown internal forces in each member of a rigid jointed plane frame is

• 1
• 2
• 3
• 6