List of practice Questions

Why do we sweat in summer?
What is photosynthesis? Write the equation of its chemical reaction.
What is bio-magnification?
What is the role of stomata and lenticels in respiration?
What is ascent of sap?
What are the essential steps for forest conservation?
Why does carbon mainly form covalent compounds?
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
Name the sodium compound which is used for softening hard water.
What is Anodising?
Write two differences between minerals and ores.
The aqueous solution of sodium carbonate is alkaline. Why?
Write down the laboratory method of preparation of methane and its chemical reaction with chlorine.
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?
What do you understand by 'short-circuit'?
How is the resistance of a wire affected by its area of cross-section?
Define focus of a concave spherical mirror. Prove that in a concave mirror \( R = 2f \).
Explain conductor, insulator, and semiconductor with examples.
Write the balanced chemical equations for the following reactions:
(a) Zinc + Silver nitrate → Zinc nitrate + Silver
(b) Sodium + Water → Sodium hydroxide + Hydrogen.
Which one of the following is a metalloid?
CaCO\(_3\)(s) → CaO(s) + CO\(_2\)(g) is what type of reaction?
Which of the following equations is balanced?
Which of the following causes acid rain in industrial areas?