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.

HAMLIE, 2015 E.C JULY 2023 G.C

You may refer to the information given below when you need to work on some of the questions.

Name of constantsSymbolValue
Acceleration due to gravityg10 m/s2
Mass of protonmp1.67 x 10-27 kg
The charge of electrone-1.6 x 10-19 C
Universal gravitational constantG6.67 x 10-11 Nm2/kg2
Density of waterρ1000 kg/m3
Molar gas constantR8.314 J/mol.K
permittivity of vacuumε8.85 x 10-12 F/m
Magnetic permeability of free spaceμ04 x 10-7 Tm/Aπ
Coulomb's constantk9 x 109 Nm2/C2
Planck's constanth6.63 x 10-34 Js
sin15° = 0.26
cos15° = 0.97
sin30° = cos60° = 0.5
sin60° = cos30° = 0.87
sin37°= cos53° = 0.6
cos37° = sin53° = 0.8

1. Which one of the following statements does NOT describe coherent light or interference of coherent light?

  1. Coherent light waves have the same frequency and wavelength.
  2. In order for two waves to be coherent, they must be the same type of wave.
  3. Sustainable interference pattern can be formed by two waves with variable phase difference.
  4. Two waves which maintain constant phase relationship can produce sustained interference.

2. Kirchhoff's junction rule is a consequence of conservation of

  1. electrical energy.
  2. charge.
  3. mass.
  4. momentum.

3. Which one of the following statements describes the photoelectric effect interaction of radiation with matter?

  1. The intensity of radiation incident on a material can affect the energy of photoelectrons emitted from the metal surface.
  2. In photoelectric effect, the photoelectron energy is directly proportional to the wavelength of incident radiation.
  3. Any value of energy of photons (radiations) is capable of producing photoelectrons from a metal.
  4. When radiation of certain frequency f, interact with atoms of a material, electrons will be emitted with energies proportional to the radiation energy

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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