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 651: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1] Options:
  A) 840J
  B) 3360J
  C) 3420J
  D) 4200J
  E) 7560J
  Show Answer
  The correct answer is E .
• Question 652: A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is Options:
  A) a little above half of its initial energy
  B) a little below half of its initial energy
  C) a half of its initioal energy
  D) a little above its initial energy
  E) a little below its initial energy
  Show Answer
  The correct answer is C .
• Question 653: Neutron were discovered by Options:
  A) J.J. Thompson
  B) James Chadwick
  C) Michael faraday
  D) Dalton
  Show Answer
  The correct answer is B .
• Question 654: The rise or fall of a liquid in a narrow tube is because of the Options:
  A) viscosity of the liquid
  B) surface tension of the liquid
  C) friction between the walls of the tube and the liquid
  D) osmotic pressure of the liquid
  Show Answer
  The correct answer is C .
• Question 655: The time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is Options:
  A) 250days
  B) 150days
  C) 300days
  D) 200days
  Show Answer
  The correct answer is A .
• Question 656:

  An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 $P_a$, what is the absolute pressure in $P_a$ in the tank if the height of the mercury in the open tube is 25 cm higher. density of mercury = $13600kg/m^3,g=9.8m/s^2$

  Options:
  A) 108,986 Pa
  B) 165,238 Pa
  C) 122,364 Pa
  D) 134,645 Pa
  Show Answer
  The correct answer is D .
• Question 657: A spring of force constant 500 NM^-1 is compressed such that its length shortens by 5cm. The energy stored in the spring is? Options:
  A) 0.625 J
  B) 6.250 J
  C) 62.500 J
  D) 625.000 J
  Show Answer
  The correct answer is A .
• Question 658: In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material Options:
  A) 0.75 days
  B) 2.58 days
  C) 4 days
  D) 4.80 days
  E) 6 days
  Show Answer
  The correct answer is D .
• Question 659: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 660: Isotopes are nuclei which have Options:
  A) the same number of nuetrons and electrons
  B) equal number of electrons and protons
  C) the same atomic number but different number of neutrons
  D) the same number of total particles
  Show Answer
  The correct answer is C .