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Friday, 22 May 2026
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Physics Past Questions and Answers

Jamb 1998 Physics Questions

Question 26:
A steel wire of length 0.50m is stretched between two fixed points and its fundamental frequency is 200Hz. The speed of the wave in the wire is
  • A 100ms<sup style='font-size: smaller;'>-1</sup>
  • B 120ms<sup style='font-size: smaller;'>-1</sup>
  • C 200ms<sup style='font-size: smaller;'>-1</sup>
  • D 250ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 27:
In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is
  • A 70Hz
  • B 840Hz
  • C 1120Hz
  • D 1960Hz
View Answer & Explanation
Question 28:
An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be
  • A Virtual and diminished
  • B Magnified and erect
  • C Real and inverted
  • D Diminished and erect
View Answer & Explanation
Question 29:
An object is placed in front of two plane mirrors inclined at an angle of 0o. If the total number of images formed is 7, Find the value of \(\theta\)
  • A 30<sup style='font-size: smaller;'>o</sup>
  • B 45<sup style='font-size: smaller;'>o</sup>
  • C 51<sup style='font-size: smaller;'>o</sup>
  • D 90<sup style='font-size: smaller;'>o</sup>
View Answer & Explanation
Question 30:
The most suitable type of mirror used for the construction of the search light is the
  • A Concave mirror
  • B Convex mirror
  • C Spherical mirror
  • D Parabolic mirror
View Answer & Explanation