List of top Questions asked in Bihar Board Class X Exam

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:
Which one of the following is the natural source of oxalic acid?
Propane, with the molecular formula \( C_3H_8 \), has:
Ozone layer protects earth from which harmful radiation?
Which non-metal is found in liquid state at room temperature?
The general formula of alkyne is:
The far point for normal vision is:
What will be the nature of the image of an object, if the magnification of the image is negative?
How many laws are there for the reflection of light?
A ray of light is incident perpendicular to a plane mirror. The angle of reflection will be:
Which colour of light scatters more in the atmosphere?
Converging lens in air is:
What is the colour of silver iodide?
The hardest natural substance is: