WAEC Physics practical Questions and Answers 2025 (Alternative B) Theory Solution

To craft an article on “WAEC Physics Practical Questions and Answers 2025 (Alternative B) Theory Solution” along with five FAQs, we will structure the content to provide a detailed guide, including possible experiment setups, expected answers, and frequently asked questions. Here’s an outline for the article:

WAEC Physics Practical Questions and Answers 2025 (Alternative B) – Theory Solution

The West African Examinations Council (WAEC) Physics Practical exam is a significant component of the WAEC Physics paper, designed to assess students’ understanding of practical aspects of physics through experiments, observations, and theoretical deductions. The practical exam typically covers topics such as optics, electricity, mechanics, and heat.

Note: This article provides insights into the possible questions for the 2025 Physics Practical (Alternative B) and their solutions. The answers below serve as a guide for students preparing for their WAEC exams.

Sample Physics Practical Questions and Answers (2025) – Alternative B

Question 1: Determining Focal Length of a Concave Mirror

You are provided with a concave mirror, an illuminated object (cross-wire), a screen, and a meter rule. You are required to find the focal length of the concave mirror.

Procedure:

1. Set up the apparatus as described.
2. Move the screen until a sharp image of the cross-wire is formed on it.
3. Measure the distance between the screen and the concave mirror (denoted as $v$) and the distance between the illuminated object and the mirror (denoted as $u$).
4. Record your readings.

Formula:
The mirror formula is:

1f=1u+1v\frac{1}{f} = \frac{1}{u} + \frac{1}{v}f1​=u1​+v1​

Where:

• $f$ = focal length
• $u$ = object distance
• $v$ = image distance

Sample Readings:

• Object distance ($u$) = 20 cm
• Image distance ($v$) = 30 cm

Solution:

1f=120+130=3+260=560=112\frac{1}{f} = \frac{1}{20} + \frac{1}{30} = \frac{3 + 2}{60} = \frac{5}{60} = \frac{1}{12}f1​=201​+301​=603+2​=605​=121​ $$f=12\text{cm}$$

Conclusion:
The focal length of the concave mirror is 12 cm.

Question 2: Verification of Ohm’s Law

You are provided with a voltmeter, ammeter, a resistor, a power supply, and connecting wires. Use the apparatus to verify Ohm’s law.

Procedure:

1. Connect the circuit as shown in the diagram.
2. Vary the voltage from the power supply and measure the corresponding current using the ammeter.
3. Record the voltage (V) and current (I) for each setting.
4. Plot a graph of V against I.

Expected Result:

• According to Ohm’s Law, $V=IR$, the graph of voltage (V) against current (I) should be a straight line, showing that the voltage is directly proportional to the current.

Sample Readings:

Conclusion:
The straight-line graph verifies Ohm’s Law, showing that voltage is directly proportional to current, and the resistance of the resistor is constant.

Question 3: Determination of the Refractive Index of Glass

You are given a rectangular glass block, a ray box, protractor, and ruler. Determine the refractive index of the glass block.

Procedure:

1. Place the glass block on a sheet of paper and trace its outline.
2. Direct a ray of light at an angle $i$ (angle of incidence) to one of the faces of the block.
3. Trace the emergent ray and measure the angle of refraction $r$.
4. Record your observations.

Formula:
The refractive index $n$ is given by:

n=sin⁡isin⁡rn = \frac{\sin i}{\sin r}n=sinrsini​

Sample Readings:

• Angle of incidence ($i$) = 30°
• Angle of refraction ($r$) = 19°

Solution:

n=sin⁡30°sin⁡19°=0.50.325=1.54n = \frac{\sin 30°}{\sin 19°} = \frac{0.5}{0.325} = 1.54n=sin19°sin30°​=0.3250.5​=1.54

Conclusion:
The refractive index of the glass block is approximately 1.54.

FAQs on WAEC Physics Practical

1. How can I prepare effectively for the WAEC Physics practical exam?

   • To prepare effectively, review your past practical notebooks, practice drawing accurate diagrams, and understand the theory behind each experiment. Familiarize yourself with common apparatus and experiment procedures. Practice answering past WAEC Physics practical questions under exam conditions.

2. What are the common experiments in WAEC Physics practical?

   • Common experiments include determining the focal length of lenses and mirrors, verifying Ohm’s Law, determining the refractive index of materials, and experiments on heat transfer and mechanical systems (such as moments of force).

3. Can I bring a scientific calculator into the Physics practical exam?

   • Yes, you are allowed to bring a non-programmable scientific calculator to the exam. Ensure that you are comfortable using it for quick calculations, especially for equations like Ohm’s Law or lens formulae.

4. What is the format of the WAEC Physics Practical (Alternative B)?

   • The alternative to practical (Alternative B) typically presents candidates with theoretical problems based on experiments, requiring calculations, drawing graphs, or describing procedures. The format includes diagrams and data, asking students to analyze or solve based on the given information.

5. How is the WAEC Physics Practical exam graded?

   • The practical exam is graded based on your ability to follow instructions, take accurate measurements, calculate results correctly, plot graphs neatly, and make logical deductions. Presentation matters, so ensure your work is neat and methodical.

Conclusion

By following these solutions and practicing with similar questions, you will be well-prepared for the WAEC Physics Practical 2025 (Alternative B). Keep in mind the importance of understanding the theory behind each experiment, as it is essential for accurately answering questions and performing well in the exam.

Related Article: WAEC Chemistry practical Questions and Answers 2023 (100% Sure) Theory Solution

Related Links:

• WAEC Official Website
• Physics Practical Past Questions and Answers

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