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 691: Which of the following statements about electrolysis is NOT correct? Options:
  A) The substances in solution in the electrolyte become ionized
  B) Ions are electrically charged and are attracted towards electrodes when a potential difference is applied
  C) Ions may be discharged at the electrodes, forming bubbles or deposits
  D) The mass deposited depends upon the length of time for which current flows
  E) The mass of gas set free or metal deposited is proportional to the square of the current
  Show Answer
  The correct answer is E .
• Question 692: Light of velocity 3 x 10⁸ms^-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 10⁸ms^-1 in the material, what is n? Options:
  A) 2.33
  B) 2.25
  C) 1.33
  D) 1.25
  Show Answer
  The correct answer is D .
• Question 693:

  A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of ${40}^o$ with the normal. Calculate the angle of refraction in the glass.

  [Refractive index of water = 1.33, Refractive index of glass = 1.5]

  Options:
  A) ${29.36}^o$
  B) ${25.37}^o$
  C) ${37.21}^o$
  D) ${34.75}^o$
  Show Answer
  The correct answer is D .
• Question 694: What is the velocity of sound at 100 ^oC if the velocity of sound at 0 ^oC is 340ms ^-1? Options:
  A) 497m^-1
  B) 440m^-1
  C) 397m^-1
  D) 240m^-1
  Show Answer
  The correct answer is B .
• Question 695:

  

  The resultant capacitance in the figure above is

  Options:
  A) 15.0µF
  B) 9.8µF
  C) 1.3µF
  D) 0.8µF
  Show Answer
  The correct answer is D .
• Question 696:

  Arrange the following in the order of their increasing frequency.I. Visible light

  II. Gamma rays

  III. Radio waves

  IV. Infra-red radiation

  V. Ultra-violet radiation

  Options:
  A) I, II, III, IV, V
  B) II, III, IV, V, I
  C) III, IV, V, I, II
  D) IV, III, I. V, II
  E) III, IV, I,V, II
  Show Answer
  The correct answer is E .
• Question 697: What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm? Options:
  A) Compound microscope
  B) Galileo's telescope
  C) Terrestrial telescope
  D) Astronomical telescope
  Show Answer
  The correct answer is D .
• Question 698:

  When a brick is taken from the earth's surface to the moon, its mass

  Options:
  A) Remains constant
  B) Becomes zero
  C) Reduces
  D) increases
  Show Answer
  The correct answer is A .
• Question 699:

  

  In the figure above, XY is of length 1m, The value of R at balance point Z is

  Options:
  A) 3.0Ω
  B) 13.3Ω
  C) 15.0Ω
  D) 30.0Ω
  Show Answer
  The correct answer is D .
• Question 700: Which of the following is NOT a component of an a.c. generator? Options:
  A) Armature
  B) Carbon brushes
  C) Magnet
  D) Slip ring
  E) Split rings
  Show Answer
  The correct answer is E .