Question

1. how long should plaster be left to dry on the mold? *

a. 1 hour
b. 6 hours
c. 12 hours
d.24 hours

1. what historical application of radial design was significant in 19th - century architecture? *

a. urban planning
b. residential home construction
c. bridge engineering
d. railroad station layouts

Explanation:

Question 7

To determine how long plaster should be left to dry on the mold, we refer to typical construction or plastering practices. Plaster generally requires a full day (24 hours) to dry sufficiently on molds, especially for proper setting and strength development. Options like 1, 6, or 12 hours are too short for adequate drying.

In 19th - century architecture, radial design was significantly applied to railroad station layouts. Urban planning (a) is more about city - wide design, residential home construction (b) is for housing, and bridge engineering (c) focuses on bridges. Railroad stations in the 19th century, with the growth of rail transport, often used radial designs to organize tracks and passenger flow.

Answer:

D. 24 hours

Question 8