Physics 2018 Past Question | WAEC

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.

31. Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q.                                     \([G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]\)

  • A. \(1.11\times 10^{-7} N\) towards P
  • B. \(1.11\times 10^{-7} N\) towards Q
  • C. \(9.26\times 10^{-8} N\) towards P
  • D. \(9.26\times 10^{-8} N\) towards Q

32. The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

  • A. 50V
  • B. 100V
  • C. 200V
  • D. 400V

33. In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle θ to the horizontal. As θθ increases, the velocity ratio of the plane

  • A. increases
  • B. decreases
  • C. remain the same
  • D. decreases and later increases

34. When the speed of a car is halved, its kinetic energy is

  • A. doubled
  • B. quartered
  • C. halved
  • D. quadrupled

35. A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

  • A. 250ms1
  • B. 625ms1
  • C. 1200ms1
  • D. 1500ms1

36. PHYSICS 2019 JAMB

The diagram above illustrates a waveform. Determine the number of wavelengths in it

  • A. 4
  • B. 3 1/2
  • C. 2 1/2
  • D. 2
 

37. A resistor with fixed resistance value is called a

  • A. resistance box
  • B. standard resistor
  • C. shunt resistor
  • D. multiplier resistor

38. Which of the following statements is not an advantage of an alkaline accumulator?

  • A. The electrolyte does not need attention
  • B. It can be recharged
  • C. It has low internal resistance
  • D. It has a much longer life than lead-acid accumulator

39. PHYSICS 1The diagram above illustrates the wire connections to a three-pin plug. The wires P, Q and R respectively are:

  • A. live, neutral and earth
  • B. neutral, earth and live
  • C. earth, live and neutral
  • D. earth, neutral and live

40. Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor  is inversely proportional to the distance between the plates

II. Capacitors can filter a.c signals from d.c 

III. Capacitors can store charges

  • A. I only
  • B. I and II only
  • C. II and III only
  • D. I, II and III
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