Waec Physics Past Questions
Question 1716
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 1717
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
Question 1718
A galvanometer with a full-scale deflection of 20 mA is Converted to read 8 K by connecting a 395 \(\Omega\) resistor in series with it. Determine the internal resistance of the galvanometer
- A. 2.5\(\Omega\)
- B. 5.0\(\Omega\)
- C. 8.0\(\Omega\)
- D. 10.0\(\Omega\)
Question 1719
Which of the following statements about electric potential energy is not correct?
- A. The electric potential energy of a positively charged particle increases when it moves to a point of higher potential
- B. The electric potential energy of a negatively charged particle increases when it moves to a point of lower potential
- C. The electric potential energy of a positively charged particle decreases when it moves to a point of higher potential
- D. The work done in taking a charged particle around a closed path in an electric field is zero.
Question 1720
Three cells each of emf, 1.0 V, and internal resistance, 2 \(\Omega\), are connected in parallel across a 3\(\Omega\) resistor. Determine the current in the resistor.
- A. 0.90A
- B. 0.39A
- C. 0.30A
- D. 0.01A
