PBA PHYSICS HSSC II

HSSC II PBA PHYSICS

Curriculum 2006

Detailed Practical Notes

Section A – (60% Practical Marks)

1.    Determine Resistance of wire by Slide Wire Bridge.

        Key Questions:

• Factor affecting the resistance of slide wire bridge.
• Plot graph (if required).
• Calculate using relevant formula (𝑅 = 𝜌 𝐿 𝐴 ).

2.    Determine internal resistance of a cell using potentiometer.

        Key Questions: 

• Purpose of Potentiometer. 
• Difference Between Load and Internal Resistance. 
• Plot graph (if required). Calculate using relevant formula (𝑟 = 𝜀−𝑉 𝐼 ).

3.    Determine e.m.f of a cell using potentiometer. 

        Key Questions: 

• How emf is different from potential difference 
• Plot graph (if required). 
• Calculate using relevant formula (𝜀 = 𝑉 + 𝐼𝑟).

4.    Determine the e.m.f and internal resistance of a cell by plotting V against I graph.

        Key Questions: 

• What is the relation between emf and internal resistance. 
• Plot graph (if required). 
• Calculate using relevant formula (𝜀 = 𝑉 + 𝐼𝑟).

5.    Determine resistance of voltmeter by drawing graph between R and I/V.

Key Questions: 

• Voltmeter and Galvanometer. 
• Combination of Resistance with Galvanometer. 
• Plot graph (if required). 
• Calculate using relevant formula (𝑅ℎ = 𝑉 / 𝐼𝑔 − 𝑅𝑔)

6.    Determine the relation between current and capacitance when different capacitors are used in AC circuit

Key Questions: 

• Factors affecting capacitance of capacitors. 
• Series and Parallel combination of capacitors. 
• Current and Voltage in Series and Parallel circuits. 
• Plot graph (if required). 
• Calculate using relevant formula (𝐶 = 𝐴𝜖𝑜 / 𝑑 ).

Section B – (40% Practical Marks)

1.   Determine time constant by charging and discharging a capacitor through a resistor. 

Key Questions: 

• Application of time constant. 
• Factor affecting time constant. 
• Plot graph (if required). 
• Calculate using relevant formula (𝜏 = 𝑅𝐶).

2.    Investigate the relationship between current and the potential applied Tungsten Filament Bulb. 

Key Questions: 

• Ohm’s Law and Tungsten Filament Bulb. 
• Joule’s Law. 
• Plot graph (if required). 
• Calculate using relevant formula (V=IR, 𝐻 = 𝐼2𝑅𝑇).

3.     Characteristics of semiconductor diode and forward and reverse current resistances.

Key Questions: 

• Intrinsic & Extrinsic Semiconductors. 
• Forward and Reverse Bias Circuits. 
• Plot graph (if required). 
• Understand the relevant Circuits and Diagrams.

4.    Variation of electric current with intensity of light using a Photocell. 

Key Questions: 

• Relation of Current and Intensity. 
• Stephen Boltzmann Law. 
• Plot graph (if required). 
• Calculate using relevant formula (𝐿 ∝ 𝐼, 𝐿 ∝ 𝐼 4 ).

5.    Variation of Resistance of Thermistor with temperature.

Key Questions: 

• Thermistors relation with temperature. 
• Types and Applications of Thermistors. 
• Plot graph (if required).

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