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WAEC WASSCE Physics 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample WAEC WASSCE Physics 2009 questions

1. An ideal transformer has 500 turns on its primary coil and 2000 turns on its secondary coil. If the primary voltage is 12 V, what is the secondary voltage?
  1. 3 V
  2. 24 V
  3. 48 V
  4. 60 V

Answer: C. 48 V

For an ideal transformer, Vs/Vp = Ns/Np = 2000/500 = 4, so Vs = 48 V.

2. Which change will increase the magnetic field strength inside a long solenoid, if its length and core remain unchanged?
  1. Increase the current through the coil
  2. Decrease the number of turns per unit length
  3. Replace the iron core with air
  4. Reverse the current without changing its magnitude

Answer: A. Increase the current through the coil

The field inside a solenoid is proportional to the current when its turn density and core are unchanged.

3. A coil rotating in a magnetic field produces an alternating emf mainly because the magnetic flux linking it changes; this process is called
  1. electrolysis
  2. magnetic saturation
  3. electrostatic induction
  4. electromagnetic induction

Answer: D. electromagnetic induction

An emf is induced when the magnetic flux linking a coil changes.

4. In a domestic circuit, a fuse should be connected in the
  1. earth wire only
  2. live wire
  3. neutral wire only
  4. earth and neutral wires together

Answer: B. live wire

A fuse in the live wire disconnects the appliance from the supply when excessive current flows.

5. A charge of 600 C passes a point in a circuit in 2 minutes. What is the current?
  1. 5 A
  2. 3 A
  3. 12 A
  4. 300 A

Answer: A. 5 A

Current I = Q/t = 600/(2 x 60) = 5 A.

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