Physics 2014 WAEC Past Questions

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The energy stored in a simple cell is

A. electrical
B. nuclear
C. thermal
D. chemical

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Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90° out of phase

A. i and ii only
B. i and ii only
C. i, ii and iii only
D. i, ii, iii and iv

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An electric motor converts

A. electrical energy to mechanical energy
B. mechanical energy to electrical energy
C. mechanical energy to chemical energy
D. electrical energy to thermal energy

View Answer & Discuss (1) WAEC 2014

A 15 \(\mu F\) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [\(\pi = 3.142\)]

A. 16\(\Omega\)
B. 68\(\Omega\)
C. 106\(\Omega\)
D. 212\(\Omega\)

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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]

A. 21\(\mu C\)
B. 3.6\(\mu C\)
C. 4.0\(\mu C\)
D. 4.4\(\mu C\)

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Physics 2014 WAEC Past Questions

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