Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 441: The main function of the commutator in a simple d.c. motor is to Options:
  A) enable the armature to rotate freely
  B) increase the flux linking the armature windings
  C) maintain a direct current in the armature
  D) provide uniform magnetic field around the armature
  E) reverse the direction of the current in the armature.
  Show Answer
  The correct answer is E .
• Question 442: If the relative density of gold is 19.2, the volume of 2.4kg of gold is? Options:
  A) 8.00 x 10^-3 m³
  B) 1.25 x 10^-4 m³
  C) 1.92 x 10^-4 m³
  D) 4.61 x 10^-3 m³
  Show Answer
  The correct answer is B .
• Question 443:

  When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?

  Options:
  A) The stopping potential does not change.
  B) The stopping potential decreases.
  C) The stopping potential can either increase or decrease, depending on the intensity of the light.
  D) The stopping potential increases.
  Show Answer
  The correct answer is D .
• Question 444: Electrons were discovered by Options:
  A) James Chadwick B.
  B) J.J Thompson
  C) Sir Isaac Newton
  D) Charles Newton
  Show Answer
  The correct answer is B .
• Question 445:

  Which of the following instruments may be used to measure relative humidity?

  Options:
  A) Hydrometer
  B) Manometer
  C) Hygrometer
  D) Hypsometer
  Show Answer
  The correct answer is C .
• Question 446:

  I. The frictional force is independent of the area of the surfaces in conduct
  II. The frictional force depends on the nature of the surfaces in contact
  III. The frictional force depends on the speed of sliding
  IV. The frictional force is directly proportional to the normal reaction.

  Which combination of the above is true of sliding friction?

  Options:
  A) I, III and IV
  B) I, II and IV
  C) I, II and III
  D) II, III and IV
  Show Answer
  The correct answer is B .
• Question 447: Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is Options:
  A) conical
  B) cubical
  C) cylindrical
  D) parabolic
  E) spherical
  Show Answer
  The correct answer is C .
• Question 448:

  I. The motion of the tyres of a moving car.

  II. The motion of a loaded test tube oscillated

  vertically.

  III. The beating of the heart.

  IV. A stone tied to a string and whirled round.

  V. The motion of the pistons in a gasoline engine.

  Which of the motions above is simple harmonic?

  Options:
  A) III, IV and V only
  B) II, III and V only
  C) II, III and IV only
  D) I,II and III only
  Show Answer
  The correct answer is B .
• Question 449: An electric motor primary converts Options:
  A) electrical energy to chemical energy
  B) electrical energy to heat energy
  C) electrical energy to mechanical energy
  D) mechanical energy to electrical energy
  E) mechanical energy to light energy
  Show Answer
  The correct answer is C .
• Question 450: An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively Options:
  A) (A – 2) and (Z – 2)
  B) (A + 4) and (Z + 2)
  C) (A– 4) and (Z+2)
  D) (A+ 4) and (Z – 2)
  E) (A – 4) and (Z – 2)
  Show Answer
  The correct answer is A .