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 271: An electric iron is rated 1000W, 230V. What is the resistance of its elements? Options:
  A) 51.9Ω
  B) 52.9Ω
  C) 55.9Ω
  D) 57.6Ω
  Show Answer
  The correct answer is B .
• Question 272: A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours? Options:
  A) 1/32
  B) 1/16
  C) 1/8
  D) 1/4
  E) 1/2
  Show Answer
  The correct answer is B .
• Question 273: A calorimeter of thermal capacity 80J contains 20g of water at 25^oC. Water at 100^oC is added so that the final temperature of the set-ups is 50^oC. The amount of water added is (Heat capacity of water = 4.18J/g/^oC) Options:
  A) 20g
  B) 25g
  C) 45g
  D) 50g
  E) 100g
  Show Answer
  The correct answer is A .
• Question 274: Heat was supplied to a block of ice at 0^oC until half of it melted. Which of the following statements is true? Options:
  A) the temperature rises and the ice expand
  B) the temperature remains constant and the volume of the ice decreases
  C) the ice gives out heat as it melts and the temperature decreases
  D) the mass remains constant and the temperature increases
  E) the temperature decreases because some heat is lost
  Show Answer
  The correct answer is B .
• Question 275: The inner diameter of a test tube can be measured accurately using a Options:
  A) micrometer screw guage
  B) pair of dividers
  C) metre rule
  D) pair of vernier calipers
  Show Answer
  The correct answer is D .
• Question 276: A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108ms${}^{-1}$. Calculate the wavelength of the radio wave Options:
  A) 2.20 × 10${}^3$m
  B) 5.0 × 10${}^2$m
  C) 5.0 × 10${}^5$m
  D) 11.8 × 10${}^{11}$m
  Show Answer
  The correct answer is B .
• Question 277: A conductor has a diameter of 1.00mm and length of 2.00m. If the resistance of the material is 0.1Ω, the resistivity is Options:
  A) 2.55 * 10⁵ Ωm
  B) 2.55 * 10³ Ωm
  C) 3.93 * 10^-6 Ωm
  D) 3.93 * 10^-8 Ωm
  Show Answer
  The correct answer is D .
• Question 278:

  Which of the following option is right if an object fall freely to the ground?1. The total energy is Kinetic

  2. The ratio of potential energy to kinetic energy is constant

  3. The sum of potential and kinetic is constant

  Options:
  A) 1 only
  B) 2 only
  C) 3 only
  D) 1 and 2 only
  Show Answer
  The correct answer is C .
• Question 279:

  

  The diagram above shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are

  Options:
  A) 8.0 ms^-2, 4,0 ms^-2
  B) 4.0 ms^-2, 8.0 ms^-2
  C) 4.0 ms^-2, 2.0 ms^-2
  D) 2.0 ms^-2, 4.0 ms^-2
  Show Answer
  The correct answer is C .
• Question 280:

  A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

  Options:
  A) 180${}^o$
  B) 90${}^o$
  C) 0${}^o$
  D) 60${}^o$
  Show Answer
  The correct answer is C .