List of top Science Questions asked in Bihar Board Class X Exam

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.
Why does carbon mainly form covalent compounds?
Name the sodium compound which is used for softening hard water.
The aqueous solution of sodium carbonate is alkaline. Why?
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
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 \( R = 2f \).
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 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.
Which of the following equations is balanced?
CaCO\(_3\)(s) → CaO(s) + CO\(_2\)(g) is what type of reaction?
Which one of the following is a metalloid?
Draw a ray diagram to show refraction of light at both refractive surfaces of a prism placed in air.
Which of the following causes acid rain in industrial areas?
What is persistence of vision?
Draw a labelled diagram of an electric bulb.
Which non-metal is found in liquid state at room temperature?
If the lower half of a concave mirror gets broken, then the image: