Physics 2019 Past Question | WAEC

Physics WAEC Past Questions

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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. An electron of mass 9.1 x 10−31kg moves with a speed of 2.0 x 106ms−1 round the nucleus of an atom in a Circular path of radius 6.1 x 1011 Calculate the centripetal force acting on the electron.

  • A. 7.7 x 1047 N
  • B. 6.0 x 10−8N
  • C. 3.0 x 10−14N
  • D. 1.3 x 10−26N

32. A device consumes 100 W of power when connected to a 120 V source. Calculate its resistance. 

  • A. 1.2Ω
  • B. 12,000 Ω
  • C. 20.0Ω
  • D. 144Ω

33. Which property of a wave remains constant when the wave travels from one medium into another?

  • A. Amplitude
  • B. Wavelength
  • C. Velocity
  • D. Frequency 

34. The anomalous expansion of water occurs in the range 

  • A. 0 °C to 100 °C
  • B. 0 °C to 4 °C
  • C. 4 °C to 100 C
  • D. -4 °C to 0 °C

35.  A ray of light travelling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

  • A. 48.6°
  • B. 19.5°
  • C. 20.0 
  • D. 45.0

36. A rectangular piece of iron measuring 4 cm by 3 cm at 20oC is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10−5K−1]

  • A. 12.0144 cm3
  • B. 12.0346 cm3
  • C. 12.0288 cm3 
  • D. 12.0173 cm3

37. Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy?

  • A. A
  • B. B
  • C. C
  • D. D

38. The diagram above illustrates an object moving in a circular path at a constant speed. Which of the arrows indicates the direction of linear velocity?

  • A. z
  • B. X
  • C. Y
  • D. W

39. Which of the following thermometers is used to measure the temperature of the human body?

  • A. Thermocouple
  • B. Alcohol-in-glass thermometer
  • C. Gas thermometer
  • D. Platinum resistance thermometer

40. In the diagram above, the time taken to trace a wave between P and Q is

  • A. 2 periods
  • B. 1 period
  • C. 1 1/2 periods
  • D. 1 1/4 periods

41. Which of the following materials does not serve as a safety device in electrical circuits? 

  • A. Connecting wires
  • B. Earth wire
  • C. Fuse
  • D. Switch

42. Which of the following liquids has the highest surface tension?

  • A. Soapy water
  • B. Cold water
  • C. Hot water
  • D. oily water 

43. The nucleon and proton numbers of a neutral atom of an element are 238 and 92 respectively. Determine the number of neutrons in the atom. 

  • A. 119
  • B. 330
  • C. 165
  • D. 146

44. An instrument used to measure relative humidity is the

  • A. hygrometer
  • B. hydrometer
  • C. pyrometer
  • D. manometer

45. The area under a velocity-time graph represents

  • A. speed
  • B. acceleration
  • C. moment
  • D. distance
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