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 741: A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the Options:
  A) 80%
  B) 75%
  C) 50%
  D) 33%
  Show Answer
  The correct answer is B .
• Question 742: The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is Options:
  A) 380mmHg
  B) 570mmHg
  C) 190mmHg
  D) 480mmHg
  Show Answer
  The correct answer is B .
• Question 743:

  A body falls freely under gravity (g = 9.8ms^-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

  Options:
  A) 784ms^-1
  B) 80ms^-1
  C) 78.4ms^-1
  D) 39.2ms^-1
  E) 27.7ms^-1
  Show Answer
  The correct answer is E .
• Question 744: A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N? Options:
  A) 1.12cm
  B) 2.14cm
  C) 2.24cm
  D) 2.52cm
  Show Answer
  The correct answer is C .
• Question 745: A pilot records the atmospheric pressure outside its plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and that of air = 0.00013) Options:
  A) 1200m
  B) 6300m
  C) 7500m
  D) 13800m
  Show Answer
  The correct answer is A .
• Question 746:

  The limiting frictional force between two surfaces depends on

  I. the normal reaction between the surfaces

  II. the area of surface in contact

  III. the relative velocity between the surfaces

  IV. the nature of the surfaces

  Options:
  A) I only
  B) II only
  C) III only
  D) I and IV only
  Show Answer
  The correct answer is D .
• Question 747: Under what conditions are cathode rays produced in a discharge tube? Options:
  A) High pressure and low voltage
  B) High pressure and high voltage
  C) Low pressure and low voltage
  D) Low pressure and high volatge
  Show Answer
  The correct answer is D .
• Question 748: If a wheel 1.2 m in diameter rotates at one revolation per second, calculate the velocity of the wheel. Options:
  A) 3.6 ms^-1
  B) 3.77 ms^-1
  C) 4.0 ms^-1
  D) 7.5 ms^-1
  Show Answer
  The correct answer is B .
• Question 749:

  The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mmabove the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

  Options:
  A) 55.3${}^o$C
  B) 23.3${}^o$C
  C) 49.0${}^o$C
  D) 16.43${}^o$C
  Show Answer
  The correct answer is B .
• Question 750: If the size of the hole of a pinhole camera is increased, the image formed becomes Options:
  A) brighter and blurred
  B) brighter and larger
  C) brighter and sharper
  D) blurred and duller
  E) blurred and larger
  Show Answer
  The correct answer is E .