Waec Physics 2014 Past Questions and Answers

Question 41:

• WAEC 2014

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\(\mu C\)

Question 42:

• WAEC 2014

In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit ``

A. 1.8A
B. 1.0A
C. 0.8A
D. 0.3A

Question 43:

• WAEC 2014

A wire of length 100 cm has a resistance of 10\(\Omega\). If its cross-sectional area is 0.005cm², determine its resistivity

A. 0.0005\(\Omega\)cm
B. 0.0015\(\Omega\)cm
C. 0.0016\(\Omega\)cm
D. 0.0700\(\Omega\)cm

Question 44:

• WAEC 2014

A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary col. If the input voltage is 150 volts. Calculate the magnitude of the output voltage

A. 150V
B. 55V
C. 36V
D. 15V

Question 45:

• WAEC 2014

The circuit above illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will

A. Increase sharply
B. Decrease slightly
C. Remains the same
D. Increase gradually