Physics 2017 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

11. A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

  • A. 80.0%
  • B. 76.6%
  • C. 66.7%
  • D. 60.7%

12. Three 3ω resistance are connected in parallel what is the equivalent resistance?

  • A. 1ω
  • B. 9ω
  • C. 3ω
  • D. 0.33ω

13. Which of the following instruments helps to maintain the correct humidity and temperature of a building?

  • A. A compressor
  • B. A refrigerator
  • C. Air blower
  • D. Air conditioner

14. The thermal expansion of a solid is an advantage in

  • A. Balance wheel of a watch
  • B. Construction of steel rail lines
  • C. Construction of large steel bridges
  • D. Fitting of tyres on wheels

15. The S.I unit of moment of a force is

  • A. kgm
  • B. µm
  • C. Jm
  • D. µm1

16. A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

  • A. 80.0%
  • B. 76.6%
  • C. 66.7%
  • D. 60.7%

17. Calculate the light 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

18. 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

19. 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

20. 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 cummutator
  • D. coil is wound on a soft iron armature
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