## Physics 2017 Past Questions | JAMB

Study the following 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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