Solve Sources of Energy Class 10 Chapter 14 Science MCQ
FAQs on Sources of Energy Class 10 MCQ for Practice
1. What are the most frequently asked 1-mark MCQ topics from the 'Sources of Energy' chapter for the CBSE Class 10 board exam?
For the CBSE Class 10 Science exam, the most important topics for MCQs in this chapter are identifying renewable vs. non-renewable sources (e.g., solar, coal), the primary constituent of biogas (methane), the energy conversion in solar cells (solar to electrical), the material used in solar cells (silicon), and the process used in nuclear reactors (nuclear fission).
2. Which topics from 'Sources of Energy' are important for 3-mark questions in the board exams 2025-26?
For 3-mark questions, focus on explaining concepts with their respective advantages and limitations. The most expected topics are:
- The construction and working of a biogas plant, along with its benefits.
- The principle, advantages, and limitations of a solar cooker.
- The pros and cons of harnessing wind energy using wind farms.
- The environmental consequences of using fossil fuels.
3. Are there any expected 5-mark questions from Chapter 14: Sources of Energy, and what should be included in the answer?
Yes, 5-mark questions from this chapter typically require a detailed explanation with a well-labelled diagram. For the 2025-26 exams, prepare for the construction and working of a hydroelectric power plant or a nuclear power plant. A high-scoring answer must include the diagram, a step-by-step explanation of the working principle, and a list of at least two advantages and two disadvantages.
4. What are the key characteristics of a 'good source of energy' that I must mention in an exam answer?
According to the NCERT syllabus, a complete answer describing a good source of energy should include the following points:
- High calorific value: It should produce a large amount of energy per unit mass or volume.
- Economical and easily available: It should be affordable and accessible.
- Safe and convenient to store and transport: It should not pose significant risks.
- Causes minimal environmental pollution: It should be clean-burning and have a low ecological impact.
5. Why is it not feasible to use hydrogen as a widespread domestic fuel, despite it having a high calorific value and being non-polluting?
The primary challenges preventing the widespread use of hydrogen fuel are practical and economic. First, hydrogen is highly combustible and explosive, which makes its safe storage and transportation a major technological hurdle. Second, the most common method of producing pure hydrogen, electrolysis of water, is a very expensive and energy-intensive process, making it economically unviable for large-scale domestic use at present.
6. How does the construction of large dams for hydroelectric power, a renewable source, lead to significant environmental problems?
While hydroelectric power is renewable, large dams cause severe environmental damage. Building a dam submerges vast areas of agricultural land and forests, leading to the loss of biodiversity and natural habitats. The decomposition of submerged vegetation under anaerobic conditions releases large amounts of methane, a potent greenhouse gas. Furthermore, it disrupts aquatic ecosystems and causes the displacement of local communities.
7. What is the fundamental difference between nuclear fission and nuclear fusion, and why do nuclear power plants only use fission?
The main difference lies in the nuclear process. Nuclear fission is the splitting of a heavy, unstable nucleus (like Uranium-235) into lighter nuclei. Nuclear fusion is the combining of two light nuclei (like hydrogen isotopes) to form a heavier nucleus. Current nuclear power plants rely exclusively on fission because it is a controllable chain reaction. Achieving and sustaining the extremely high temperatures and pressures required for nuclear fusion (similar to the sun's core) is a massive technological challenge that has not yet been solved for commercial power generation.
8. Beyond air pollution, why is there an urgent global need to shift away from fossil fuels to alternative sources of energy?
The most critical reason is that fossil fuels (coal, petroleum, natural gas) are a finite, non-renewable resource. They took millions of years to form and are being consumed at a rate far faster than they can be replenished. This over-reliance leads to energy insecurity, making national economies vulnerable to price shocks and geopolitical conflicts. Shifting to renewable sources like solar, wind, and geothermal is essential for long-term energy sustainability and independence.
