List of top Science Questions asked in JKBOSE Class X Board

What is Biological Magnification, and how does it affect different trophic levels?
How is the sex of a child determined in human beings?
Explain how gaseous exchange occurs in plants through stomata and lenticels.
What is the importance of DNA copying in reproduction?
Describe the process of Double Fertilization in flowering plants.
Distinguish between Sexual and Asexual reproduction with examples.
What is Transpiration, and how does it help in the upward movement of water in plants?
Describe the mechanism of Respiration in humans, including the role of alveoli.
Explain the role of Thyroxin and Insulin hormones in the human body.
Define Reflex Action and explain the pathway of a Reflex Arc with an example.
Explain the neutralisation reaction with an example and its utility in daily life.
What are amphoteric oxides? Give two examples.
Differentiate between metals and non-metals based on their chemical properties.
Explain the formation of Ionic Compounds (e.g., \(NaCl\) or \(MgCl_2\)) and state their properties.
Explain the mechanism of cleaning action of soap (micelle formation).
Explain the process of Photosynthesis and write its balanced chemical equation.
Explain the difference between displacement and double displacement reactions with equations.
Define Oxidation and Reduction reactions with suitable examples (Redox reactions).
Define Acids and Bases according to the Arrhenius theory.
Define scattering of light and explain the Tyndall effect with an example.
What is the pH scale, and why is pH important in everyday life?
Balance the following chemical equations: \(H_2 + O_2 \rightarrow H_2O\) and \(NaOH + HCl \rightarrow NaCl + H_2O\).
Define Corrosion and Rancidity and suggest methods for their prevention.
Write the chemical formula and two uses of Washing Soda and Plaster of Paris (POP).
Calculate the focal length of a lens with power –2.0 D and identify its type.