Cold-chain management is critical in maintaining the potency the vaccine vial monitor (VVM) is used to monitor the A. colour of the vaccine vail. B. cumulative heat exposure to the vaccine C. potency of the vaccine opened. D. temperature of the vaccine carrier

Here are the answers to your questions:

7. Cold-chain management is critical in maintaining the potency of the vaccine. The vaccine vial monitor (VVM) is used to monitor the...
B) cumulative heat exposure to the vaccine
A Vaccine Vial Monitor (VVM) is a label on a vaccine vial that changes color irreversibly when the vaccine has been exposed to heat over time, indicating the total heat exposure, not just the current temperature or color of the vial.

8. All these vaccines are sensitive to heat EXCEPT
A) DPT/HibHeb
While all vaccines require proper storage, DPT (Diphtheria, Pertussis, Tetanus) and Hib/HepB vaccines are generally considered more heat-stable compared to live attenuated vaccines like Measles, Polio (Oral Polio Vaccine), and Rotarix, which are highly sensitive to heat.

9. To promote good ventilation in a room, you will educate...
B) I and III
I. Open windows more often: This is a direct and effective way to promote air circulation and ventilation in a room.
III. Plant trees around the house: Trees can provide shade, cool the surrounding air, and improve air quality, which indirectly contributes to a more comfortable environment and supports good ventilation practices when windows are opened. Painting the room with bright colors (II) and providing a good wooden ceiling (IV) do not directly promote ventilation.