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Physics 1997 JAMB Past Questions

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26

If the load at the end of a sonometer wire is immersed in a bucket of water, the original fundamental frequency of the wire could be restored by

  • A. decrease the length of the wire
  • B. increasing the length of the wire
  • C. increasing the mass per unit length of the wire
  • D. changing the temperature of the wire
View Answer & Discuss (24) JAMB 1997
27
A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a
  • A. convex mirror with his face at the focus
  • B. concave mirror with his face between the focus and the mirror
  • C. concave mirror with his face at the focus
  • D. convex mirror with his face between the focus and the mirror
View Answer & Discuss (6) JAMB 1997
28
Light of velocity 3 x 108ms-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 108ms-1 in the material, what is n?
  • A. 2.33
  • B. 2.25
  • C. 1.33
  • D. 1.25
View Answer & Discuss JAMB 1997
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29
The electromagnetic waves that are sensitive to temperature changes are
  • A. X-rays
  • B. Gamma-rays
  • C. Ultra-violet rays
  • D. Infra-red rays
View Answer & Discuss (5) JAMB 1997
30
Three electric cells each of e.m.f 1.5V and internal resistance of 1.0\(\Omega\) are connected in parallel across an external resistance of \(\frac{2}{3}\)\(\Omega\). Calculate the value of the current in the resistor
  • A. 0.5 A
  • B. 0.9A
  • C. 1.5A
  • D. 4.5A
View Answer & Discuss (14) JAMB 1997
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