Applying your learning in practicals is not only easy, but also fun. At the same time, it lets you earn precious 30 marks that help increase your score in the final exam. So, it becomes important to earn all those 30 marks fully. There is a simple way to achieve that. If you plan well and prepare, those 30 marks will be effortlessly yours. Let us examine how the practicals are evaluated and marks are awarded.

**Evaluation Scheme **

Time Allowed : 3 Hours |
Max Marks: 30 |
---|---|

Two experiments one from each section | 8+8 Marks |

Practical record [experiments and activities] | 6 Marks |

Investigatory Project | 3 Marks |

Viva on experiments, activities and project | 5 Marks |

Total |
30 marks |

As you may have completed the practical record and project by the time of practicals, let us focus on the experiments. There are two experiments, one from each section - Section A and Section B.

**SECTION–****A **

**Experiments**

- • To determine resistance per cm of a given wire by plotting a graph for potential difference versus current.
- • To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material.
- • To verify the laws of combination (series) of resistances using a metre bridge.
- • To verify the laws of combination (parallel) of resistances using a metre bridge.
- • To compare the EMF of two given primary cells using potentiometer.
- • To determine the internal resistance of given primary cell using potentiometer.
- • To determine resistance of a galvanometer by half-deflection method and to find its figure of merit.
- • To convert the given galvanometer (of known resistance and figure of merit) into a voltmeter of desired range and to verify the same.
- • To convert the given galvanometer (of known resistance and figure of merit) into an ammeter of desired range and to verify the same.
- • To find the frequency of AC mains with a sonometer.

**SECTION–B**

**Experiments**

- • To find the value of
*v*for different values of*u*in case of a concave mirror and to find the focal length. - • To find the focal length of a convex mirror, using a convex lens.
- • To find the focal length of a convex lens by plotting graphs between
*u*and*v*or between*1/u*and*1/v*. - • To find the focal length of a concave lens, using a convex lens.
- • To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation.
- • To determine refractive index of a glass slab using a travelling microscope.
- • To find refractive index of a liquid by using convex lens and plane mirror.
- • To draw the I-V characteristic curve for a p-n junction in forward bias and reverse bias.
- • To draw the characteristic curve of a zener diode and to determine its reverse break down voltage.
- • To study the characteristic of a common - emitter
*npn*or*pnp*transistor and to find out the values of current and voltage gains.

**The key to scoring those 30 marks lies in these two sections. Focus on these experiments, prepare well and earn full marks with ease!**