Physics - Grade 12 - 2023 G.C
19 . An object of mass M is attached to a spring of spring constant K, as shown in the figure below.
1
If the mass is pulled to a point P, which is at distance A from equilibrium position O, and released, Which one of the following statements is correct about energy of the system? ( assume the surface is frictionless)

  1. At point O, the system has both kinetic and potential energy.
  2. At point P, the system has both kinetic energy and potential energy.
  3. At point P, the mass attain its maximum velocity.
  4. At point Q the system has both kinetic energy and potential energy.


20 . A force F→=(i^-3k^)N acts on a wooden bar and drags the bar through a displacement of r→=4i^m. What is the torque due to the force in N.m?

  1. 4i^+12j^
  2. -12j^
  3. 12j^
  4. 12k^


21 . Which one of the following units is NOT a possible unit of electric field strength?

  1. voltmeter
  2. JouleCoulomb×meter
  3. NewtonCoulomb
  4. JouleCoulomb


22 . Which one of the following statements does NOT describe magnetic nature of a material?

  1. Magnetic molecules in a magnet will align when they are heated or hammered.
  2. Magnetic molecules (dipoles) are oriented randomly when a material lose its magnetism.
  3. There is no a single magnetic North or magnetic South Pole.
  4. Magnetic dipoles of a material aligned parallel when the magnetic material is placed in external magnetic field.


23 . Which one of the following statements is correct about conduction in semiconductors?

  1. The majority charge carriers in N-type semiconductors are electrons due to doping.
  2. When atoms with half-filled electrons are doped with atoms of five valance electrons, the majority charge carriers are holes.
  3. N-type semiconductor is made from half-filled shell atoms doped with accepter atoms.
  4. P-type semiconductors have holes as minority charge carriers in the crystal lattice of the material.


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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