List of practice Questions

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?
Draw a labelled diagram of an electric bulb.
What is persistence of vision?
Draw a ray diagram to show refraction of light at both refractive surfaces of a prism placed in air.
If the lower half of a concave mirror gets broken, then the image:
When a ray of light travels from air (a rarer medium) to glass (a denser medium), it bends: