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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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2141
The direction of the magnetic field at a point in the vicinity of a bar magnetic is
  • A. along the line joining the point to the neutral point
  • B. always away from the south pole of the magnet
  • C. opposite the direction of theresultant field at that point
  • D. always towards the north pole of the magnet
  • E. the direction towards which the north pole of a compass needle would point
View Answer & Discuss WAEC 1998
2142

The diagram below illustrates an a.c.source of 50V(r.m.s.), \(\frac{100}{\pi}\)Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the power factor of the circuit

  • A. 1.33
  • B. 1.25
  • C. 0.80
  • D. 0.75
  • E. 0.60
View Answer & Discuss (4) WAEC 1998
2143
The diagram below illustrates an a.c.source of 50V(r.m.s.), \(\frac{100}{\pi}\)Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the average power dissipated in the circuit
  • A. 100W
  • B. 80W
  • C. 60W
  • D. 20W
  • E. 10W
View Answer & Discuss (4) WAEC 1998
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2144
Use the following data to determine the length L of a wire when a fore of 30N is applied, assuming Hooke's law is obeyed
\(\begin{array}{c|c}\text{Force applied/N} & 0 & 5 & 10 & 30\\ \hline \text{length of wire/mm} & 500.0 & 500.0 & 501.0 & L \end{array}\)
  • A. 3.0mm
  • B. 3.5mm
  • C. 503.00mm
  • D. 503.5mm
  • E. 506.0mm
View Answer & Discuss (2) WAEC 1998
2145
Which of the following explains the concave meniscus of water in a clean glass tube? the
  • A. adhension between water and glass molecules is greater than the sdhension between water molecules
  • B. cohension between water molecules is greater then the adhension between glass and water molecule
  • C. molecules of water near the glass move faster than the molecules at the centre of the tube
  • D. molecules of water at the water-air boundary are often attracted to the centre of the tube
  • E. weight of the water pulls the centre part of the surface down
View Answer & Discuss (1) WAEC 1998
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts