Physics - Grade 12 -2023 G.C

Grade 12 students can now access their exam results by visiting the Educational Assessment and Examination Services (EAES) website.

39. Air molecules vibrate in a pipe of length L closed at one end but open at the other. If the speed of sound through the pipe is V, Which one of the following statements is correct about the resonance effects of vibration of air molecules in the pipe?

  1. VL" >The resonance frequency of the first harmonics is VL
  2. The wavelength of the third harmonic is equal to L.
  3. V4L" >The fundamental resonance frequency is V4L
  4. The fundamental wave length of resonance is equal to 2L.

40. A monochromatic light of wave length λ passes through double slits separated by a distance d. If the path difference between the lights is p and n being an integer (0,1, 2, 3,....), Which one of the following would be observed on screen behind the slits?

  1. destructive interference if p = 2 n λ
  2. destructive interference if p = 0.
  3. constructive interference if p = (n + 1/2)λ
  4. constructive interference if p = n λ

41. Suppose you are standing on a horizontal floor, in a room, with one of your feet and leaning the wall of the room with the other foot. The number of action reaction pair of forces you experience is

  1. 1.
  2. 3.
  3. 2.
  4. 4.

42. The amount of heat energy required to change a substance from a liquid to a gaseous state is known as

  1. specific heat capacity.
  2. quantity of heat.
  3. latent heat of fusion.
  4. latent heat of vaporization.

43. Which one of the following is correct about mechanical waves?

  1. The maximum height in a transverse wave is known as the trough of the wave.
  2. The time taken for one complete wave to pass a given point is called the frequency of the wave.
  3. The distance between two identical points on adjacent waves is known as the wavelength of the wave.
  4. The number of complete waves that passes a given point per time is called the period of the wave.

We have provided these questions from previous years grade 12 Ethiopian Secondary School Leaving Certificate Examination (ESSLCE) exams with the sole purpose of assisting students in their studies and preparations for upcoming exams. Please be aware that these questions are not indicative of future exam content. Good luck with your studies!

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