XII-PHYSICS PRACTICALS EXAMINATION FOR THE YEAR 2010-11 ON 07.02.2011

ROLL NUMBERS 4605691 TO 4605715-25 STUDENTS-0900 HRS TO 1200 HRS

Evaluation Scheme for Practical Examination

v One experiment from any one section         : 8 Marks.

v Two activities(one from each section)(4+4)   : 8 Marks.

v Practical record (experiments and activites)  : 6 Marks.

v Record of demonstarion experiments and viva

   based on these experiments                    : 3 Marks.

v Viva on experiments and activites             : 5 Marks.

v Total                                             : 30 Marks

SECTION-A

Experiments

AP1.To determine the resistance per cm of a given wire by plotting a graph of potential difference versus current.

AP2.To find the resistance of a given wire using metre bridge and hence determine the specific resistance of its material.

AP3.To verify the laws of combination(series and parallel) of resitances using metre bridge.

AP4.To Compare the E M F’s of two given primary cells using a potentiometer.

AP5.To determine the internal resistance of a given primary cell using a potentiometer

AP6.To determine the resistance of a galvanometer by half deflection method to find its figure of merit and to convert it into an ammeter of desired range.To verify the same.

AP7.To determine the resistance of a galvanometer by half deflection method to find its figure of merit and to convert it into a voltmeter of desired range.To verify the same.

AP8.To find the frequency of the AC mains with a sonometer(and an electromagnet)

Activities

AA1.To assemble a household circuit,comprising three bulbs,three (on/off) switches,a fuse and a power source.

AA2.To measure resistance,voltage (AC/DC), current(AC) and check continutity of a given circuit using multimeter.

AA3.To assemble the components of a given electrical circuit(say Ohm’s law circuit)

AA4.To study the variation in potential drop with length of a wire for a steady current.

AA5.To draw the diagram of a given open circuit comprising of least a battery, resistance, rheostat, key, ammeter and voltmeter.Mark the components that are not connected in proper order and correct the circuit and also the circuit diagram.

SECTION-B

Experiments

BP1.To find the value of v for different values of u in case of a concave mirror and to find the focal length( by plotting graph:i) between u and v; ii)between 1/u and 1/v)

BP2.To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.

BP3.To determine the angle of minimum deviation for a given prism by plotting a graph between the angle of incidence and the angle of deviation.And to determine the refractive index of a material(glass) of the prism.

BP4.To draw the I-V characteristic curve of a p-n junction in forward bias and reverse bias.

BP5.To draw the characteristics curve of a Zener diode and to determine its reverse breakdown voltage.

BP6.To study the characteristics of a common emitter N-P-N ( or P-N-P) transistor and to find the values of current and voltage gains

Activities

BA1.To study the effect of light(by varying distance of the source) on an LDR(Light Dependent Resistor)

BA2.To identify a diode,an LED,a transistor,an IC,a resistor and a capacitor from a mixed collection of such items.

BA3.To observe refraction and lateral deviation (displacement) of a beam of light incident obliquely on a glass slab.

BA4.To study the nature and size of the image formed by a concave mirror on a screen by using a candle and a screen for different distances of the candle from the lens.

BA5.To study the nature and size of the image formed by a convex lens on a screen by using a candle and a screen for different distances of the candle from the lens.