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 1741:

  If 16mA of current flows through a conductor in one second, the number of electron transported per seconds is

  [1 electronic charge = 1.6 x 10^-19C]

  Options:
  A) 1.00 x 10²⁰
  B) 2.56 x 10^-18
  C) 2.56 x ^-17
  D) 1.00 x 10¹⁷
  Show Answer
  The correct answer is D .
• Question 1742: The energy in the nucleus of atoms produce heat which can be used to generate Options:
  A) Kinetic energy
  B) Mechanical energy
  C) Electrical energy
  D) Potential energy
  Show Answer
  The correct answer is A .
• Question 1743: A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances? Options:
  A) Density of liquid Z is greater than that of X
  B) Density of liquid V is less than that of liquid X
  C) Density of liquid Y is less than that of liquid Z
  D) Liquid Z has the greatest density of all the three substances.
  E) If liquids Y and Z do not mix, liquid Z will float on liquid Y.
  Show Answer
  The correct answer is E .
• Question 1744: A block-and-tackle system is used to lift a load of 20N through a vertical height of 10m. if the efficiency of the system is 40%, how much work is done against friction? Options:
  A) 80J
  B) 120J
  C) 300J
  D) 500J
  Show Answer
  The correct answer is C .
• Question 1745: Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain Options:
  A) pressure is increased
  B) pressure is reduced
  C) the rays of the sun add more heat to the water
  D) the saturation vapour pressure of water is higher than at sea-level
  E) the temperature is lower than at sea-level
  Show Answer
  The correct answer is B .
• Question 1746: Calculate the wavelength of light travelling with a speed of 3 × 108ms^-1 and a frequency of 6.2 × 10¹⁴Hz. Options:
  A) 4.8 × 10^-8m
  B) 4.8 × 10^-7m
  C) 4.8 × 10^-6m
  D) 4.8 × 10^-5m
  E) 4.8 × 10^-4m
  Show Answer
  The correct answer is B .
• Question 1747: The pitch of an acoustic device can be increased by Options:
  A) increasing the frequency
  B) increasing the amplitude
  C) decreasing the loudness
  D) decreasing the intensity
  Show Answer
  The correct answer is A .
• Question 1748: If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is? Options:
  A) 25%
  B) 33%
  C) 75%
  D) 82%
  Show Answer
  The correct answer is C .
• Question 1749: A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2] Options:
  A) 1000 N
  B) 700 N
  C) 110 N
  D) 10 N
  Show Answer
  The correct answer is D .
• Question 1750: A quantity of ice at 10^oC is heated until the temperature of the heating vessel is 90^oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel? Options:
  A) specific heat capacity of ice
  B) specific heat capacity of water
  C) specific latent heat of fusion
  D) specific latent heat of vaporization
  Show Answer
  The correct answer is D .