Tension in Trusses:

Trusses are structural frameworks consisting of interconnected members used to support loads. These members can experience different types of forces based on their position and orientation within the truss. One of the possible states is tension, where a member is subjected to pulling forces.

The State of Tension:

When a member is in a state of tension, it means that the forces acting on it are pulling it apart. This is in contrast to compression, where the forces are pushing the member together. Tension forces generally act along the length of the member, trying to elongate it.

Options A, C, and D:

Option A suggests that a member in tension is subjected to a push force. However, this is incorrect as tension forces are pulling forces and not pushing forces.

Option C suggests that a member in tension is subjected to a lateral force. Lateral forces act perpendicular to the length of the member and are not directly related to tension. Therefore, this option is also incorrect.

Option D states that a member in tension can experience either a pull or a push force. While members in trusses can indeed experience a variety of forces, the specific state of tension refers specifically to pulling forces. Therefore, this option is also incorrect.

Correct Answer (Option B):

Option B correctly states that a member in tension is subjected to a pull force. Tension forces act along the length of the member, pulling it apart. This is the characteristic behavior of a member in tension.

Conclusion:

In summary, when a member in a truss is in a state of tension, it experiences pulling forces. These forces act along the length of the member, trying to elongate it. Therefore, the correct answer is option B - pull.