Question

question 1 (1 point)
the measure of stiffness.
a toughness
b modulus of elasticity
c ductility
d strength
question 2 (1 point)
what material is used to strengthen concrete in tension?
a columns
b glue
c asphalt
d rebar

Explanation:

For Question 1, the modulus of elasticity is a measure of stiffness, representing how a material resists elastic deformation under stress. Toughness is related to energy - absorption capacity, ductility to the ability to be deformed plastically, and strength to the ability to withstand load.
For Question 2, rebar (steel reinforcement bar) is commonly used to strengthen concrete in tension as concrete is weak in tension and steel has high tensile strength. Columns are structural elements, glue is not used for this purpose in the same context, and asphalt is a different construction material.

Answer:

Question 1: B. modulus of elasticity
Question 2: D. rebar