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WAEC WASSCE Physics 2013 past questions and answers

This 2013 WAEC WASSCE Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2013 set with instant marking.

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Sample WAEC WASSCE Physics 2013 questions

1. A radioactive sample has a mass of 80 g and a half-life of 6 hours. What mass remains after 18 hours?
  1. 10 g
  2. 20 g
  3. 5 g
  4. 40 g

Answer: A. 10 g

Eighteen hours is three half-lives, so the mass falls to 80/2^3 = 10 g.

2. In alpha decay, what nuclide is produced when uranium-238 (atomic number 92) emits an alpha particle?
  1. Thorium-238, atomic number 90
  2. Thorium-234, atomic number 90
  3. Uranium-234, atomic number 92
  4. Protactinium-234, atomic number 91

Answer: B. Thorium-234, atomic number 90

An alpha particle removes 2 protons and 2 neutrons, leaving thorium-234 with atomic number 90.

3. In a forward-biased p-n junction diode, conventional current in the external circuit flows from the
  1. n-region to the p-region through the diode
  2. negative terminal to the positive terminal
  3. p-region to the n-region through the diode
  4. junction equally in both directions

Answer: C. p-region to the n-region through the diode

Forward bias lowers the junction barrier and allows conventional current through the diode from its p-region to its n-region.

4. A north pole of a magnet is moved toward a coil. Which principle determines the direction of the induced current?
  1. Snell's law
  2. Ohm's law
  3. Coulomb's law
  4. Lenz's law

Answer: D. Lenz's law

Lenz's law states that the induced current acts to oppose the change in magnetic flux that produces it.

5. An ideal transformer has 1000 turns on its primary coil and a primary voltage of 240 V. If the secondary voltage is 12 V, how many turns are on the secondary coil?
  1. 50
  2. 20
  3. 200
  4. 500

Answer: A. 50

For an ideal transformer, Ns/Np = Vs/Vp, so Ns = 1000 x 12/240 = 50 turns.

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