Waec Physics Past Questions For Year 1995
Question 31
A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms-1, what is the minimum frequency which will resonate with the wire?
- A. 50 Hz
- B. 75 Hz
- C. 100 Hz
- D. 150 Hz
- E. 200 Hz
Question 32
A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105NC-1. What is the magnitude of the electric force exerted on the charge?
- A. 3.2 x105N
- B. 1.8 x105N
- C. 3.2 x10-5N
- D. 1.8 x10-5N
- E. 4.0X10-6N
Question 33
What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)
- A. 2GR
- B. 2G/R
- C. 2GR2
- D. 2GM/R
Question 34
A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with a different.
- A. frequencies
- B. pitches
- C. loudness
- D. intensities
- E. overtones
Question 35
An alternating voltage with a frequency of 50Hz has a period of
- A. 0.02s
- B. 0.05s
- C. 0.20s
- D. 0.50 s
- E. 50.00s
