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: 1,000 identical drops of oil of density 500kgm^-3 have a total mass of 5 x 10^-4kg. One of the drops forms a thin film of area 0.5m² on water. The thickness of the film is Options:
  A) 2 x 10^-8m
  B) 2 x 10^-9m
  C) 2 x 10^-7m
  D) 3 x 10^-9m
  E) 2.8 x 10^-8m
  Show Answer
  The correct answer is B .
• Question 222: A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is Options:
  A) y = 0.15 sin 200π(x - 5.5t)
  B) y = 0.15 sin π(0.01x - 5.5t)
  C) y = 0.15 sin 5.5π(x - 200t)
  D) y = 0.15 sin π(550x - 0.01t)
  Show Answer
  The correct answer is A .
• Question 223: Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms^-2. [g = 10ms^-2] Options:
  A) 686N
  B) 595N
  C) 581N
  D) 105N
  Show Answer
  The correct answer is D .
• Question 224: THe velocity of sound in air at 16^oC is 340ms^-1. What will it be when the pressure is doubled and its temperature raised to 127^oC? Options:
  A) 400 ms^-1
  B) 4,000 ms^-1
  C) 8,000 ms^-1
  D) 160,000 ms^-1
  Show Answer
  The correct answer is A .
• Question 225:

  

  In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted ray, what is the refractive index of the glass

  Options:
  A) 1.73
  B) 1.50
  C) 0.87
  D) 0.57
  Show Answer
  The correct answer is A .
• Question 226: The ratio of the coefficient of linear expansion of two metals ^∝₁/_∝2 is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, ^e₁/_e2 is 1:2, the ratio of the original lengths ^l₁/_l2 is Options:
  A) ⁸/₃
  B) ³/₂
  C) ²/₃
  D) ³/₈
  Show Answer
  The correct answer is C .
• Question 227:

  A 1000kg elevator is descending vertically with an acceleration of 1.0ms^-2, if the acceleration due to gravity is 10ms^-2, the tension in the suspending cable is

  Options:
  A) 1.0N
  B) 10.0N
  C) 9000.0N
  D) 11000N
  Show Answer
  The correct answer is C .
• Question 228: When two mirrors are placed at an angle of 900 to each other, how many images will be formed when an object is placed in front of the mirrors Options:
  A) 5
  B) 4
  C) 3
  D) 2
  Show Answer
  The correct answer is C .
• Question 229: The best material for the core of the primary and secondary coils of an induction coil is Options:
  A) copper, because it has a good conductor of electricity
  B) steel, because it becomes magnetic and retains its magnetism for a long time
  C) rubber, because it is a good insulator and the user is prevented from shock
  D) soft iron, because it becomes magnetic but easily loses its magnetism
  E) glass, because it is transparent
  Show Answer
  The correct answer is D .
• Question 230: The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because Options:
  A) atmospheric pressure acts on the surface of the lake
  B) pressure increases with depth
  C) density remains constant with pressure
  D) the bubble experiences an upthrust
  Show Answer
  The correct answer is B .