PPSC PCS 2025 · Question 2 of 100

Which of the following statements is incorrect?

Science & Tech

AGeothermal energy from heated areas of the Earth’s crust is extracted by drilling wells to bring steam or hot water to the surface.
BIn fission, the mass of the end products is less than the mass at the beginning, but in fusion, this is not the case.Correct
CBiomass is an example of indirect solar energy because it includes organic materials produced by photosynthesis.
DHarnessing wind energy is profitable in islands and in mountain passes.

Answer: B. In fission, the mass of the end products is less than the mass at the beginning, but in fusion, this is not the case.

Statement (b) is incorrect: fusion also involves a mass defect — the end products weigh less than the starting nuclei, the lost mass becoming energy.

Source: https://www.nimbusias.com/wp-content/uploads/2025/12/Punjab-PCS-GS-Original-Paper-2025.pdf

Practice the full PPSC PCS 2025 paper

Timed test with all 100 questions, just like the real exam.

PPSC PCS 2025 · Question 2 of 100

Science & Tech

AGeothermal energy from heated areas of the Earth’s crust is extracted by drilling wells to bring steam or hot water to the surface.
BIn fission, the mass of the end products is less than the mass at the beginning, but in fusion, this is not the case.Correct
CBiomass is an example of indirect solar energy because it includes organic materials produced by photosynthesis.
DHarnessing wind energy is profitable in islands and in mountain passes.

Statement (b) is incorrect: fusion also involves a mass defect — the end products weigh less than the starting nuclei, the lost mass becoming energy.

Source: https://www.nimbusias.com/wp-content/uploads/2025/12/Punjab-PCS-GS-Original-Paper-2025.pdf

Practice the full PPSC PCS 2025 paper

Timed test with all 100 questions, just like the real exam.