In the case of preliminary estimate prepared per unit basis, the service units to be considered for a school and hospital are respectively:
- Abench and ward
- Bclassroom and bedCorrect
- Cbench and bed
- Dclassroom and ward
Solution
Concept
In the service unit method, cost is found per unit of service the building gives: per classroom for a school and per bed for a hospital.
Formula
Approximate cost = Number of service units × Cost per service unit
Step-by-step solution
1. A preliminary estimate on a per unit basis uses the service unit method. 2. For a school, the service unit is a classroom (or student). 3. For a hospital, the service unit is a bed. 4. So the answer is classroom and bed.
Explanation
In the service unit method, we multiply the number of service units by the cost of one unit. For a school the unit is a classroom, and for a hospital the unit is a bed. This gives a quick rough cost before detailed design.
Why the other options are wrong
A: bench and ward are not standard service units. C: bench is not the standard unit for a school. D: ward is not the standard unit for a hospital; bed is used.
Shortcut
School → classroom, Hospital → bed, Hostel → bed, Theatre → seat, Office → employee.
Common mistake
Choosing ward for a hospital. Wards have different sizes, so the bed is used as the standard unit.
Correct answer: B) classroom and bed