## Physics 2019 Past Question | WAEC Study the following 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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