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1826

Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high

  • A. 10 cm
  • B. 16 cm
  • C. 5 cm
  • D. 14 cm
View Answer & Discuss (8) JAMB 2017
1827
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is
  • A. 1:4
  • B. 4:1
  • C. 1:1
  • D. 2:1
View Answer & Discuss (8) JAMB 2017
1828
When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
  • A. 240v
  • B. 340v
  • C. 480v
  • D. 57600v
View Answer & Discuss (8) JAMB 2017
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1829

Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo

  • A. number of turns in the coil is increased
  • B. strength of the field magnet is increased
  • C. slip rings are replaced with split ring commutator
  • D. coil is wound on a soft iron armature
View Answer & Discuss (1) JAMB 2017
1830

The net capacitance in the circuit above is

  • A. 80µF
  • B. 6.0µF
  • C. 4.0µF
  • D. 2.0µF
View Answer & Discuss (5) JAMB 2017
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