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 221: A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is Options:
  A) 4%
  B) 5%
  C) 40%
  D) 50%
  E) 80%
  Show Answer
  The correct answer is E .
• Question 222: Which of the following is a pure semiconductor? Options:
  A) carbon
  B) silicon
  C) transistor
  D) phosphorus
  Show Answer
  The correct answer is B .
• Question 223:

  

  In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?

  Options:
  A) red, green and blue
  B) Green, red and blue
  C) Yellow , blue and red
  D) Blue , yellow and red
  Show Answer
  The correct answer is A .
• Question 224: The difference between sound waves and light waves is that sound waves Options:
  A) are transverse while light waves are longitudinal
  B) require a medium to travel while light waves does not
  C) can be diffracted but light waves cannot
  D) cannot be reflected but light waves can
  Show Answer
  The correct answer is B .
• Question 225:

  

  In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?

  Options:
  A) 27W
  B) 18W
  C) 9W
  D) 5W
  Show Answer
  The correct answer is A .
• Question 226: The use of electrical fuses in domestic wiring is Options:
  A) to prevent and electrical shock
  B) to supply electricity to all the electrical appliances
  C) to allow electricity to flow easily through the mains to all the circuits
  D) to cut off the mains supply it too high a current flows
  E) to fuse all the circuit into one
  Show Answer
  The correct answer is D .
• Question 227: Which statement is NOT correct about molecules? Options:
  A) The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.
  B) Molecules are made up of atoms
  C) The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas
  D) Molecules of gases are in regular motion
  E) Molecules of a solid vibrate about their mean positions.
  Show Answer
  The correct answer is D .
• Question 228: A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5] Options:
  A) 300.0°
  B) 48.6°
  C) 60.0°
  D) 75.5°
  E) 105.0 °
  Show Answer
  The correct answer is B .
• Question 229: The electrochemical equivalent of silver is 0.0012gC^-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be Options:
  A) 6000A
  B) 100A
  C) 10A
  D) 1A
  Show Answer
  The correct answer is B .
• Question 230: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .