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.

24. A small source emits sound waves which are spherical. The intensity of the sound wave measured at a distance r = 3.0 m from the source is I = 5 W/m2. At what distance from the source would the intensity be one-fourth as much as it is at r = 3.0 m?

  1. 4.5 m
  2. 6.0 m
  3. 12.0 m
  4. 9.0 m

25. Consider a system of two point masses M2 and M2, with M1 = 0.5 M2. The two masses are located on the x-y plane as shown in the figure below.
Which one of the following alternatives indicates the position of center of mass of the system?

  1. (163,113)cm" >(163,113)cm
  2. (113,163)cm" >(113,163)cm
  3. (5,4) cm" >(5,4) cm
  4. (53,73)cm" >(53,73)cm

26. What is the acceleration due to gravity at an altitude twice the radius of the Earth? (gE, is the gravitational acceleration on the surface of the Earth).

  1. 3gE" >3gE
  2. gE4" >gE4
  3. gE3" >gE3
  4. gE9" >gE9

27. Four capacitors are connected in a capacitor network as shown in the figure below.
The equivalent capacitance between terminals a and b in μF is

  1. 4
  2. 1/4
  3. 3/4
  4. 12

28. A 64 V battery is connected to a series combination of 3 kΩ bulb and 4Ω electric iron. If the total current in the circuit is 8 mA, what is the internal resistance of the battery?

  1. 8 kΩ
  2. 15 kΩ
  3. 1 kΩ
  4. 7 kΩ

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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