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: If the pressure on 100cm³ of an ideal gas is doubled while its kelvin temperature is halved, then the new volume of the gas will become Options:
  A) 25cm³
  B) 50cm³
  C) 100cm³
  D) 200cm³
  E) 400cm³
  Show Answer
  The correct answer is A .
• Question 72: An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1] Options:
  A) 420S
  B) 336S
  C) 168S
  D) 48S
  Show Answer
  The correct answer is B .
• Question 73:

  If it takes 5.0 hrs to drain a container of 540.0cm³ of water, what is the flow rate of water from the container in kg^-1? [Density of water = 1000kgm^-3]

  Options:
  A) 32.5kg^-1 s
  B) 31.5kg^-1 s
  C) 30.8kg^-1 s
  D) 30.0kg^-1 s
  Show Answer
  The correct answer is D .
• Question 74: The length of mercury thread when it is at 0^oC, 100^oC and at an unknown temperature $\theta$ is 25mm, 225mm and 175mm respectively. The value of $\theta$ is Options:
  A) 85.0^oC
  B) 80.0^oC
  C) 75.0^oC
  D) 70.0^oC
  Show Answer
  The correct answer is C .
• Question 75: What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height? Options:
  A) 20cm
  B) 15cm
  C) 10cm
  D) 5cm
  Show Answer
  The correct answer is C .
• Question 76: In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to Options:
  A) volt, ampere and hertz
  B) ohms, volt and hertz
  C) watt, ohms and radian
  D) ohms, hertz and joule
  Show Answer
  The correct answer is B .
• Question 77: A train has an initial velocity of 44ms^-1 and an acceleration of -4ms^-1. Its velocity after 10 seconds is Options:
  A) 2ms^-1
  B) 4ms^-1
  C) 8ms^-1
  D) 12ms^-1
  E) 16ms^-1
  Show Answer
  The correct answer is B .
• Question 78: A piece of substance of specific head capacity 450JKg^-1K^-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms^-2] Options:
  A) 2/9°C
  B) 4/9°C
  C) 9/4°C
  D) 9/2°C
  Show Answer
  The correct answer is B .
• Question 79: A piece of wood floats inside water at room temperature with a fraction of it above the liquid surface. As the temperature of the water is raised, the part of the wood above the liquid will Options:
  A) decrease because the density of water decreases with temperature
  B) increase because the density of water decreases with temperature
  C) decreases because the density of water increases with water temperature
  D) increase because the density of water increases with temperature
  Show Answer
  The correct answer is A .
• Question 80: An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by Options:
  A) ${}_{82}^{222}Z$
  B) ${}_{88}^{222}Z$
  C) ${}_{86}^{226}Z$
  D) ${}_{80}^{226}Z$
  Show Answer
  The correct answer is B .