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 71: A uniform solid cube material 10cm on each side of mass 700g is submerged in water. which of the following best described the behavior of the cube water? Options:
  A) the cube will melt after a period of time
  B) the cube will float
  C) the cube will sink in water
  D) the cube will rest at an equilibrium position in water
  Show Answer
  The correct answer is B .
• Question 72: When a sound wave passes from air into water its Options:
  A) speed and frequency increases but its wavelength remains the same
  B) speed and wavelength increases but its frequency remains the same
  C) speed decreases
  D) speed remains the same but its frequency and wavelength change
  E) speed increases but its frequency and wavelength decreases
  Show Answer
  The correct answer is C .
• Question 73:

  

  In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω

  Options:
  A) 0.8A
  B) 1.0A
  C) 1.6A
  D) 2.4A
  Show Answer
  The correct answer is D .
• Question 74: Which of the following statements are NOT correct? Options:
  A) boiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
  B) both the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
  C) the saturated vapour presssure rises with increase in temperature
  D) the saturated vapour pressure is independent of the volume available for the vapour
  E) it is possible to boil water at a lower temperature than 100^oC at high altitude
  Show Answer
  The correct answer is E .
• Question 75: A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r. Options:
  A) 4.5Ω
  B) 1.0Ω
  C) 8.0Ω
  D) 2.0Ω
  Show Answer
  The correct answer is D .
• Question 76: X rays can be used in the study of crystal structure because they Options:
  A) have a very long-reaching wavelength
  B) have extremely short wavelength
  C) are invisible
  D) are very fast
  Show Answer
  The correct answer is B .
• Question 77: At low humidity in an environment, the human skin is usually? Options:
  A) damp and rough
  B) damp and smooth
  C) dry and rough
  D) dry and smooth
  Show Answer
  The correct answer is C .
• Question 78:

  118.8cm² surface of the copper cathode of a voltameter is to be coated with 10^-6m thick copper of density 9 x 10³kgm^-3. How long will the process run with 10A constant current?

  [3.3 x 10^-7kgC^-1]

  Options:
  A) 5.4 min
  B) 10.8 min
  C) 15.0 min
  D) 20.0 min
  Show Answer
  The correct answer is A .
• Question 79: A quantity of gas occupies a certain volume when the temperature is -73^oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas? Options:
  A) 573^oC
  B) 327^oC
  C) 300^oC
  D) 110^oC
  E) 27^oC
  Show Answer
  The correct answer is E .
• Question 80: Heat transfer by convection in a liquid is due to the Options:
  A) Latent heat of vaporization of the liquid
  B) Increased vibration of the molecules of the liquid about theit mean position
  C) Variation of density of the liquid
  D) Expansion of the liquid as it is heated
  Show Answer
  The correct answer is D .