Waec Physics Past Questions For Year 2022
Question 16
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called
- A. ferrite substance
- B. paramagnetic substance
- C. ferromagnetic substance
- D. diamagnetic substance
Question 17
The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--
- A. 3.0 x 10\(^{-5}\)s
- B. 1.0 x 10\(^{-4}\) s
- C. 1.0 x 10\(^{4}\)s
- D. 3.0 x 10\(^{4}\)s
Question 18
Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------
- A. move in a circle
- B. repel each other
- C. remain stationary
- D. attract each other
Question 19
The reason for having a large number of turns in the coil of a moving coil galvanometer is to--------
- A. make the deflection of the needle proportional to the current
- B. increase the sensitivity of the galvanometer
- C. decrease the magnetic flux produced by the magnet
- D. make the permanent magnet stronger
Question 20
The power of the lens is +2.5D. What is the radius of the curvature?
- A. 2.5 cm
- B. 25.0 cm
- C. 40.0 cm
- D. 80.0 cm
