2014 - WAEC Physics Past Questions and Answers - page 4
an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]
An object is placed in front of two plane mirrors inclined at 60o to each other. Determine the number of the images formed
An ammeter can be adapted to measure potential difference by using a
The region around a magnet in which magnetic force can be expressed is known as
In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current
The energy stored in a simple cell is
Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equal resistance ii. Current is maximum iii. Reactance are maximum iv. Current and voltage are 90o out of phase
An electric motor converts
A 15 (\mu F) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [(\pi = 3.142)]
Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 (\pi \varepsilon_o)^{-1}) = 9 x 109Nm2C-2]