List of top Science Questions asked in Bihar Board X

Write the importance of reproduction in living beings.
What is the effect of deforestation on wildlife?
What is bio-magnification?
Explore the difference between blood and lymph.
What is external respiration?
Why do we sweat in summer?
What is photosynthesis? Write the equation of its chemical reaction.
What is the role of stomata and lenticels in respiration?
What is ascent of sap?
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
Why does carbon mainly form covalent compounds?
What is Anodising?
Write two differences between minerals and ores.
What are the essential steps for forest conservation?
Write down the laboratory method of preparation of methane and its chemical reaction with chlorine.
Name the sodium compound which is used for softening hard water.
The aqueous solution of sodium carbonate is alkaline. Why?
Write the balanced chemical equations for the following reactions:
(a) Zinc + Silver nitrate → Zinc nitrate + Silver
(b) Sodium + Water → Sodium hydroxide + Hydrogen.
What do you mean by power of a lens? Write its SI unit.
What is a simple microscope? Draw its ray diagram.
What is the law of refraction of light?
Define focus of a concave spherical mirror. Prove that in a concave mirror \( R = 2f \).
What do you understand by 'short-circuit'?
How is the resistance of a wire affected by its area of cross-section?
Explain conductor, insulator, and semiconductor with examples.