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 321: The force of repulsion between two point positive charges 5$\mu$C and 8$\mu$C separated at a distance of 0.02 map art is. [$\frac{1}{4\pi {\epsilon }_o}$ = 9 x 10⁹Nm²C^-2] Options:
  A) 1.8 x 10^-10N
  B) 9.0 x 10^-8N
  C) 9.0 x 10²N
  D) 4.5 x 10³N
  Show Answer
  The correct answer is C .
• Question 322:
  

  A 400 N box is being pushed across a level floor at a constant speed by a force P of 100 N at an angle of 30.0° to the horizontal, as shown in the the diagram below. What is the coefficient of kinetic friction between the box and the floor?

  Options:
  A) 0.19
  B) 0.24
  C) 0.40
  D) 0.22
  Show Answer
  The correct answer is A .
• Question 323: The component of a vector in a given direction is Options:
  A) equal to the magnitude of the resultant vector in that direction
  B) equal to the magnitude of the resultant vector in the opposite direction
  C) its effective magnitude
  D) its effective value in that direction
  E) its effective value in the opposite direction
  Show Answer
  The correct answer is D .
• Question 324: Evaporation of a liquid produces cooling of the liquid because the Options:
  A) attraction between the vapour molecules and the liquid molecules is great
  B) average kinetic energy of the liquid is reduced
  C) density of the liquid decreases
  D) vapour pressure above the liquid rises
  E) volume of the liquid decreases
  Show Answer
  The correct answer is B .
• Question 325: The energy stored in a capacitor of capacitance 10μF carrying a charge of 100μC Options:
  A) 5 x 10⁴ J
  B) 4 x 10² J
  C) 4 x 10^-3 J
  D) 5 x 10^-4 J
  Show Answer
  The correct answer is D .
• Question 326: A clinical thermometer is different from other mercury in glass thermometers owing to Options:
  A) the constriction on its stem
  B) the grade of mercury used in it
  C) its long stem
  D) its wide range of temperatures
  Show Answer
  The correct answer is A .
• Question 327: A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio. Options:
  A) 0.53
  B) 0.83
  C) 1.20
  D) 1.50
  E) 1.88
  Show Answer
  The correct answer is E .
• Question 328: What part of a camera functions in a similar way to the retina of the eye? Options:
  A) diaphragm
  B) film
  C) focusing ring
  D) lens
  E) shutter
  Show Answer
  The correct answer is B .
• Question 329: Which of the following is a semiconductor Options:
  A) copper
  B) silicon
  C) plastic
  D) Iron
  Show Answer
  The correct answer is B .
• Question 330: A radioactive isotope has a decay constant of 10^-5s⁴. Calculate half life Options:
  A) 6.93 x 10⁵s
  B) 6.93 x 10⁵s
  C) 6.93 x10⁴s
  D) 6.93 x 10⁴s
  Show Answer
  The correct answer is C .