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 641:

  I. It retains its magnetic much longer than steel.
  II. It is more easily magnetized than steel.
  III. It is more easily demagnetized than steel.
  IV. It produces a stronger magnet than steel.

  Which combination of the above makes iron preferable to steel in the making of electromagnets?

  Options:
  A) I and II only
  B) II and III only
  C) I, III, and IV only
  D) II, III and IV only
  Show Answer
  The correct answer is B .
• Question 642: The activity of a radioactive substance depends on Options:
  A) temperature and purity
  B) temperature and age
  C) purity and age
  D) age, purity and temperature
  E) none of the above
  Show Answer
  The correct answer is E .
• Question 643:

  In an elastic collisionI. Energy is conserved

  II. Energy is decreased

  III. Energy is increased

  IV. Linear momentum conversed

  Options:
  A) I only
  B) II and IV only
  C) II only
  D) III only
  Show Answer
  The correct answer is B .
• Question 644: PHCN measures its electrical energy in Options:
  A) W
  B) KWh
  C) Wh
  D) J
  Show Answer
  The correct answer is B .
• Question 645: Which of the following properties is NOT exhibited by sound waves? Options:
  A) Diffraction
  B) interference
  C) Polarisation
  D) Reflection
  E) Refraction
  Show Answer
  The correct answer is C .
• Question 646: Radio carrier waves are generated by causing electrons to oscillate rapidly in Options:
  A) a microphone
  B) a television camera
  C) an antenna
  D) coaxial cables
  E) a transmitter
  Show Answer
  The correct answer is E .
• Question 647:

  The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

  Options:
  A) 3.33%
  B) 5.55%
  C) 33.33%
  D) 55.55%
  Show Answer
  The correct answer is C .
• Question 648:

  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 649: An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms^-1] Options:
  A) 957m
  B) 1914m
  C) 3828m
  D) 8700m
  E) 17400m
  Show Answer
  The correct answer is A .
• Question 650: Which of the following pairs of musical instruments produce sound due to the vibration of air column? Options:
  A) Bell and piano
  B) Guitar and flute
  C) Trumpet and drum
  D) Trumpet and flute
  E) Violin and organ
  Show Answer
  The correct answer is D .