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.

14. Given two vectors v1 = 10 units along the positive y-axis and v2 = 6 units at an angle of 37° above the positive x-axis. What is the scalar product of the vectors in square of units?

  1. 45
  2. 36
  3. 48
  4. 60

15. An airplane takes-off at airport A and travels 500 km due east within one hour and then turning to south it flies for 20 minutes to land on airport B which is 100 km away from the turning point. The magnitude average velocity of the plane during its flight between the two airports is

  1. 7524km/h" >7524km/h
  2. 10034km/h" >10034km/h
  3. 450km/h" >450km/h
  4. 7526km/h" >7526km/h

16. A bullet is fired with an initial speed v at an angle θ with the horizontal. It takes a time T to reach its maximum vertical displacement hmax. It hits the target point a distance R away and exactly in the horizontal level to the point where it was fired. Which one of the following statement is NOT correct about the motion of the bullet?

  1. The bullet hits the target at a time 2T after it was fired.
  2. hmax is directly proportional to the initial speed v.
  3. cos θ=22." >R will be maximum if cos θ=22.
  4. θ should be different from 90° to hit the target at a distance R.

17. A man pushes a 25.0 kg object by 250 N force along an inclined plane inclined at an angle of 37° to the horizontal. If the object moves with constant speed, the friction force exerts on the block is

  1. 250.0 N, up the inclined plane.
  2. 100.0 N, up the inclined plane.
  3. 100. 0 N, down the inclined plane.
  4. 250.0 N, down the inclined plane.

18. The following three collisions occur in different systems.
  1. A billiard ball A collides with an identical ball B and comes to rest after collision, while ball B moves with the same velocity as ball A was moving before.
  2. A bullet moving with speed v hits a suspended mass and it imbedded in it and the combination moves with common velocity.
  3. Two cars moving in opposite direction become at rest after collision.
Which of the following statements is correct about these collisions?

  1. II and III are inelastic collisions.
  2. I and II are elastic collisions.
  3. I, II and III are inelastic collisions.
  4. I and III are elastic collisions.

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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