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JAMB Physics 2026 past questions and answers

2 questions. Try each one, then open the answer to check yourself and read the explanation.

Question 8

Conduction through Liquids and Gases

For the reaction 2Fe3+ + 2I− → 2Fe2+ + I2, which of the following statements is TRUE?

  1. A.Fe is oxidized to Fe3+
  2. B.Fe3+ is oxidized to Fe2+
  3. C.I− is oxidized to I2
  4. D.I− is reduced to I2
  5. E.I− is displacing an electron from Fe3+
Show the answer and explanation

Answer: C (I− is oxidized to I2)

Explanation

Each I− loses an electron to form I2 (oxidation), and each Fe3+ gains one to become Fe2+ (reduction). So I− is oxidised to I2.

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Question 18

Density and Upthrust

40m3 of liquid P is mixed with 60m3 of another liquid Q. If the density of P and Q are 1.00kgm−3 and 1.6kgm−3 respectively, what is the density of the mixture?

  1. A.0.05kgm−3
  2. B.1.25kgm−3
  3. C.1.30kgm−3
  4. D.1.36kgm−3
Show the answer and explanation

Answer: D (1.36kgm−3)

Explanation

Total mass = 40 × 1.00 + 60 × 1.6 = 136 kg; total volume = 100 m3. Density = 136 ÷ 100 = 1.36 kg m−3.

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