Beaker insulation reduces heat loss in heating experiments. Which option best reflects this?

• A. Insulation of beaker
• B. Covering beaker with a lid
• C. Using a metal beaker
• D. Using a larger beaker

Answer: (A)

The main idea being tested is how to minimize heat loss from a hot liquid. Heat leaves the liquid and the beaker through conduction (through the beaker wall), convection (air around the beaker), and radiation (infrared heat from the surface). Insulating the beaker adds a low-conductivity layer that traps air and slows these transfers, so heat leaves more slowly. That keeps the contents hotter for longer and makes heating measurements more accurate. A lid helps mainly by reducing evaporation, but it doesn’t cut conduction and radiation as effectively as insulation. A metal beaker conducts heat away quickly, and a larger beaker exposes more surface area, which can increase heat loss, not reduce it. So insulating the beaker best reflects reducing heat loss.