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Monday, 20 April 2026
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Physics Past Questions and Answers

Topic: Micrometer

Jamb Physics Questions - Micrometer

Question 6:
The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a
  • A Concave mirror of focal length 5cm
  • B Concave mirror of focal length 10cm
  • C Convex mirror of focal length 5cm
  • D Convex mirror of focal length 20cm
View Answer & Explanation
Question 7:
From the diagram above, the measuring accuracy of the micrometer screw gauge is
  • A 4.78mm
  • B 4.16mm
  • C 4.66mm
  • D 4.70mm
View Answer & Explanation
Question 8:
A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has
  • A No charge and a zero potential
  • B A positive charge and a zero potential
  • C A negative charge and a positive potential
  • D A negative charge and a negative potential
View Answer & Explanation
Question 9:
One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is
  • A 5.16cm
  • B 5.165cm
  • C 5.0cm
  • D 5.160cm
View Answer & Explanation
Question 10:
The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?
  • A Concave mirror of focal length 5cm
  • B Concave mirror of focal length 10cm
  • C Convex mirror of focal length 5cm
  • D Convex mirror of focal length 10cm
View Answer & Explanation