Waec Physics 2001 Past Questions and Answers

Question 31:

• WAEC 2001

The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements about the frequency of vibration of the wire is not correct?

A. Proportional to the mass per unit length of the wire
B. Equal to the frequency of the tuning fork
C. Inversely proportional to the length of the wire
D. Proportional to the sqare root of the tension

Question 32:

• WAEC 2001

If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in he wire is increased to 196N

A. 130.6Hz
B. 182.9Hz
C. 358.4Hz
D. 501.8Hz

Question 33:

• WAEC 2001

The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force

A. 40.0N
B. 20.0N
C. 5.0N
D. 2.5N

Question 34:

• WAEC 2001

As the plates of a charged variable capacitor are moved closer together, the potential difference between them

A. Increased
B. Decrease
C. Remains the same
D. Is doubled

Question 35:

• WAEC 2001

What is the effective capacitance in the circuit?

A. 2\(\mu F\)
B. 6\(\mu F\)
C. 18\(\mu F\)
D. 216\(\mu F\)