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 421: What is the relative permitivity of a capacitor if its capacitance with a medium as dielectric is 16 farads and its capacitance with vacuum as dielectric is 2 farads? Options:
  A) o
  B) $\frac{1}{2}$
  C) 2
  D) 8
  E) 32
  Show Answer
  The correct answer is D .
• Question 422: A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction Options:
  A) $2\times {10}^{-4}J$
  B) $2\times {10}^{-3}J$
  C) $2\times {10}^{1}J$
  D) $2\times {10}^{2}J$
  Show Answer
  The correct answer is B .
• Question 423: Which of the following radiations have the longest wavelength? Options:
  A) Gamma rays
  B) Infra-red
  C) Light waves
  D) Radio waves
  E) Ultra-violet rays
  Show Answer
  The correct answer is D .
• Question 424: Which of the following is not a mechanical wave? Options:
  A) wave in closed pipe
  B) radio waves
  C) water waves
  D) sound waves
  Show Answer
  The correct answer is B .
• Question 425:

  A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.

  The value of R is

  Options:
  A) 3 Ω
  B) 2 Ω
  C) 1 Ω
  D) 6 Ω
  Show Answer
  The correct answer is A .
• Question 426:

  The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

  Options:
  A) yield point
  B) proportionality point
  C) deformation point
  D) elastic point
  Show Answer
  The correct answer is A .
• Question 427: A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object? Options:
  A) 12cm
  B) 24cm
  C) 48cm
  D) 108cm
  Show Answer
  The correct answer is B .
• Question 428: Which of the following properties makes metals ideal for cooking utensils? Options:
  A) high coefficient of expansion
  B) good conduction of heat
  C) low specific heat capacity
  D) poor radiation of heat
  Show Answer
  The correct answer is B .
• Question 429: When a box of mass 45kg, is given an initial speed of 5ms^-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms^-2) Options:
  A) $\frac{5}{6}$
  B) $\frac{5}{12}$
  C) $\frac{1}{3}$
  D) $\frac{2}{3}$
  Show Answer
  The correct answer is B .
• Question 430: What is the effect of the increase in the size of the hole of a pin-hole camera on the image? it Options:
  A) gives a blurred image
  B) corrects for chromatic aberration
  C) magnifies the image
  D) brings the image into a sharper focus
  Show Answer
  The correct answer is A .