WAEC Physics past questions and answers

1. Question 1

   WAEC 2024Waves

   A wave of frequency 600 Hz has a wavelength of 5 m. Find its speed.

   1. AOption A: 3000 m/s
   2. BOption B: 120 m/s
   3. COption C: 0.0083 m/s
   4. DOption D: 6000 m/s
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   Answer: A, 3000 m/s

   v = fλ = 600 × 5 = 3000 m/s.

2. Question 2

   WAEC 2024Units and measurement

   What is the SI unit of power?

   1. AOption A: Joule
   2. BOption B: Newton
   3. COption C: Watt
   4. DOption D: Volt
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   Answer: C, Watt

   Power is measured in watts (W), joules per second.

3. Question 3

   WAEC 2024Pressure

   A force of 1000 N acts on an area of 0.2 m². Find the pressure exerted.

   1. AOption A: 200 Pa
   2. BOption B: 2,500 Pa
   3. COption C: 10,000 Pa
   4. DOption D: 5,000 Pa
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   Answer: D, 5,000 Pa

   Pressure = force ÷ area = 1000 ÷ 0.2 = 5,000 Pa.

4. Question 4

   WAEC 2024Current electricity

   A potential difference of 25.2 V is applied across a 21 Ω resistor. Find the current that flows.

   1. AOption A: 529.2 A
   2. BOption B: 0.83 A
   3. COption C: 2.4 A
   4. DOption D: 1.2 A
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   Answer: D, 1.2 A

   By Ohm's law, I = V ÷ R = 25.2 ÷ 21 = 1.2 A.

5. Question 5

   WAEC 2024Density

   A sample of mass 735 g occupies a volume of 70 cm³. Calculate its density.

   1. AOption A: 0.1 g/cm³
   2. BOption B: 105 g/cm³
   3. COption C: 5.25 g/cm³
   4. DOption D: 10.5 g/cm³
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   Answer: D, 10.5 g/cm³

   Density = mass ÷ volume = 735 ÷ 70 = 10.5 g/cm³.

6. Question 6

   WAEC 2023Waves

   A wave of frequency 550 Hz has a wavelength of 0.4 m. Find its speed.

   1. AOption A: 1375 m/s
   2. BOption B: 0.0007 m/s
   3. COption C: 220 m/s
   4. DOption D: 440 m/s
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   Answer: C, 220 m/s

   v = fλ = 550 × 0.4 = 220 m/s.

7. Question 7

   WAEC 2023Current electricity

   A potential difference of 95 V is applied across a 19 Ω resistor. Find the current that flows.

   1. AOption A: 1805 A
   2. BOption B: 0.2 A
   3. COption C: 10 A
   4. DOption D: 5 A
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   Answer: D, 5 A

   By Ohm's law, I = V ÷ R = 95 ÷ 19 = 5 A.

8. Question 8

   WAEC 2023Pressure

   A force of 900 N acts on an area of 2.5 m². Find the pressure exerted.

   1. AOption A: 360 Pa
   2. BOption B: 2,250 Pa
   3. COption C: 180 Pa
   4. DOption D: 720 Pa
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   Answer: A, 360 Pa

   Pressure = force ÷ area = 900 ÷ 2.5 = 360 Pa.

9. Question 9

   WAEC 2023Density

   A sample of mass 468 g occupies a volume of 65 cm³. Calculate its density.

   1. AOption A: 0.14 g/cm³
   2. BOption B: 72 g/cm³
   3. COption C: 3.6 g/cm³
   4. DOption D: 7.2 g/cm³
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   Answer: D, 7.2 g/cm³

   Density = mass ÷ volume = 468 ÷ 65 = 7.2 g/cm³.

10. Question 10

    WAEC 2023Heat

    How much heat is needed to raise the temperature of 0.6 kg of copper by 15 °C? (Specific heat capacity of copper = 400 J/kg K.)

    1. AOption A: 1,800 J
    2. BOption B: 240 J
    3. COption C: 3,600 J
    4. DOption D: 6,000 J
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    Answer: C, 3,600 J

    Q = mcΔθ = 0.6 × 400 × 15 = 3,600 J.

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