List of practice Questions

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:
When magnesium ribbon is ignited, the flame produced by it is:
The molecular formula of ethane is \( C_2H_6 \). It has:
The chemical substance used as a cast for setting broken bones in surgery is: