Multi-step PCB application questions integrating two or more chapters.
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Q1 · Higher Order Thinking · MEDIUM
A student heats 100 g of water from 20°C to 100°C using an electric heater of power 500 W. If all the heat from the heater is absorbed by water, approximately how long will it take? (Specific heat capacity of water = 4.2 J/g°C)
Q2 · Higher Order Thinking · EASY
In an experiment, a student observes that when magnesium ribbon burns in air, the mass of the product formed is greater than the original mass of magnesium. However, when he heats calcium carbonate, the mass of the residue is less than the original mass. Which law of chemical combination explains both observations correctly?
Q3 · Higher Order Thinking · HARD
A food chain in a pond ecosystem is: Algae → Small fish → Large fish → Water bird. If pesticides enter this pond and get accumulated at each trophic level following the 10% energy rule for biomagnification factor of 10 at each level, and algae contain 0.01 ppm of pesticide, what concentration will be found in the water bird? Also, if only 10% energy is transferred at each level and algae produce 10000 J of energy, how much energy reaches the water bird?
Q4 · Higher Order Thinking · HARD
If all living organisms require water to survive, and cacti are living organisms that thrive in deserts with minimal rainfall, what is the most logical explanation?
Q5 · Higher Order Thinking · HARD
Three identical plants are kept in separate sealed transparent containers. Container X has normal air, Container Y has air enriched with extra CO₂, and Container Z has air with reduced CO₂. After two weeks in sunlight, which outcome is most likely?