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 91: Two 50$\mu$F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is Options:
  A) 5.00 x 10^-5C
  B) 2.50 x 10^-3C
  C) 1.25 x 10^-3C
  D) 1.00 x 10^-2C
  Show Answer
  The correct answer is B .
• Question 92: One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is Options:
  A) Average
  B) Zero
  C) Negative
  D) Positive
  Show Answer
  The correct answer is B .
• Question 93: Which of the following obeys ohms laws? Options:
  A) electroytes
  B) metals
  C) diode
  D) glass
  Show Answer
  The correct answer is B .
• Question 94: An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole? Options:
  A) 3.75cm
  B) 7.50cm
  C) 15.00cm
  D) 30.00cm
  E) 150.00 cm
  Show Answer
  The correct answer is C .
• Question 95:

  Calculate the heat energy required to vaporize 50g of water initially at 80ºCif the specific heat capacity of water is 4.23jg${}^{-1}$k${}^{-1}$ (specific latent heat of vaporization of water is 2260jg${}^{-1}$

  Options:
  A) 530000J
  B) 23200J
  C) 17200J
  D) 130000J
  Show Answer
  The correct answer is D .
• Question 96: A force of 500N¹ is applied to a steel wire of cross-sectional area 0.2m², The tensile stress is Options:
  A) 2.5x10⁴Nm^-2
  B) 1.0x10²Nm^-2
  C) 1.0x10³Nm^-2
  D) 2.5x10³Nm^-2
  Show Answer
  The correct answer is D .
• Question 97: The time rate of loss of heat by a body is proportional to the Options:
  A) difference in temprature between the body and its surroundings
  B) temperature of its surroundings
  C) ratio of the temperature of the body to that of its surroundings
  D) temperature of the body
  Show Answer
  The correct answer is A .
• Question 98: The radioisotope ${}_{92}^{235}U$ decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic number of the resulting element? Options:
  A) 215 and 88
  B) 91 and 227
  C) 227 and 91
  D) 92 and 238
  Show Answer
  The correct answer is C .
• Question 99:

  A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms^-2 is

  [g = 10ms^-2]

  Options:
  A) 40 N
  B) 80 N
  C) 120 N
  D) 160 N
  Show Answer
  The correct answer is C .
• Question 100: If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600µc across the field is Options:
  A) 0.8j
  B) 1.8j
  C) 9.0j
  D) 18.0j
  Show Answer
  The correct answer is B .