Waec Physics Past Questions For Year 1996
Question 41
CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.
- A. 2.38 x 107W
- B. 7.92 x 106W
- C. 3.96 x 106W
- D. 2.64 x 106W
- E. 7.92 x 104W
Question 42
The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.
- A. 128ms-1
- B. 192ms-1
- C. 384ms-1
- D. 768ms-1
- E. 1536ms-1
Question 43
The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase
- A. 20m
- B. 2.5m
- C. 3.0m
- D. 5.0m
- E. 50.0m
Question 44
Soft iron is used in making the armature of an electric bell because it
- A. retains its magnetism for a longtime
- B. Loses its magnetism readily
- C. Produces permanent magnets
- D. is not easily magnetised
- E. decreases the magnetic effect of a direct current
Question 45
A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell
- A. 1.85Ω
- B. 2.0Ω
- C. 2.4Ω
- D. 4.5Ω
- E. 5.0Ω
