List of practice Questions

What is a non-renewable source of energy? Give two examples of it.
Explain scattering of light.
Which quantity remains constant in Ohm's law, when temperature is constant? Explain.
Write any two properties of magnetic field lines.
How does the eye control the amount of light entering into it?
Prove for a concave mirror \[ \frac{1}{v} + \frac{1}{u} = \frac{1}{f} \]
What is the source of energy of the sun? Explain.
How is the concentration of OH\(^-\) ion affected on adding a base in excess to sodium hydroxide solution?
Mention two reactions that displace chlorine from bleaching powder by giving equations.
The device which directly converts solar energy into electricity is:
A bulb filament has a resistance of 1200 ohms. It is connected to a 220 V power supply. How much current will it draw?
The electromotive force of a cell is 1.5 V. The work done on passing a charge of 1 C will be:
Why is a rainbow colourful?
Find the power of a concave lens of 2 m focal length.
Define ampere.
Write any three uses of a concave mirror.
Which one of the following is a covalent compound?
An aqueous solution of ammonium chloride is:
Which of the following is a good conductor of electricity?
The radius of curvature of a concave mirror of focal length 20 cm is:
A white ray is incident obliquely on a glass slab. Which of the following will occur with the first refraction?
In domestic electric circuit, the colour of neutral wire is:
In which device does the split ring act as a commutator?
The above reaction is an example of a: \[ \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \]
On moving from right to left across the period of the modern periodic table, the atomic size: