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Physics WAEC Past Questions

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41

What is the effect of using split-rings in a simple d.c motor?

  • A. The direction of rotation of the coil is reversed
  • B. The current in the coil flows in the same direction
  • C. The current in the coil becomes alternating
  • D. The direction of the force on the coil is reversed
  • E. The contact with the voltage is cut-off
View Answer & Discuss (9) WAEC 1988
42
Which of the following statement is not correct about loaded spiral spring?
  • A. The extension is proportional to the load applied, provided the elastic limite is not exceeded
  • B. If the elsatic limit is not exceeded, the contraction is proportional to the load removed.
  • C. Up to the yield limit, extension is no longer proportional to the applied load.
  • D. Beyond the elsatic limit, extension is no longer proportional to the applied load.
  • E. If the string regains its shape or form after deformation, it is said to be elastic.
View Answer & Discuss WAEC 1988
43
Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
  • A. 0.0000267Ωcm
  • B. 0.006Ωcm
  • C. 0.26700Ωcm
  • D. 0.27500Ωcm
  • E. 0.060000Ωcm
View Answer & Discuss (4) WAEC 1988
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44
Which of the following particles of ray has the highest penetrating power?
  • A. Beta particles
  • B. Alpha particles
  • C. Gamma particles
  • D. Electrons
  • E. Neutrons
View Answer & Discuss (2) WAEC 1988
45
When sugar at the bottom of a glass of water gradually dissolves, the water level does not change applicably. Which of the following statements best describe this?
  • A. Water is suitable solvent for sugar
  • B. The sugar and the water have become single solution
  • C. The volume of water molecule does not change when sugar dissolves.
  • D. Sugar molecule is small than that of water
  • E. Water molecules are separated by large spaces between them
View Answer & Discuss (4) WAEC 1988
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