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 721: A parachute attains a terminal velocity when Options:
  A) its density is equal to the density of air
  B) the viscous force of the air and the upthrust completely counteract its weight
  C) it expands as a result of reduced external pressure
  D) the viscous force of the air is equal to the sum of the weight and upthrust
  Show Answer
  The correct answer is B .
• Question 722:

  I. Diameter of a small ball bearing.

  II. Thickness of a pieces of paper.

  III. Diameter of a measuring cylinder.

  IV. Length of a piece of wire.

  Which of the above can be measured using a micrometer screw gauge?

  Options:
  A) I, II and IV only .
  B) I and II only
  C) II and III only
  D) III and IV only
  Show Answer
  The correct answer is B .
• Question 723:

  A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?

  [g = 10 ms^-2]

  Options:
  A) 600 J
  B) 150J
  C) 300 J
  D) 450 J
  Show Answer
  The correct answer is C .
• Question 724: In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance? Options:
  A) 0.00004g/C
  B) 0.00002g/C
  C) 0.02500g/C
  D) 0.05000g/C
  E) 0.00001g/C
  Show Answer
  The correct answer is A .
• Question 725: A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary? Options:
  A) 232
  B) 450
  C) 550
  D) 2750
  E) 11000
  Show Answer
  The correct answer is D .
• Question 726: 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 727:

  The change in volume when 450kg of ice is completely melted is

  [density of ice = 900 kgm^-3, density of water = 100 kgm^-3]

  Options:
  A) 0.50m³
  B) 0.45m³
  C) 0.05m³
  D) 4.50m³
  Show Answer
  The correct answer is C .
• Question 728: The note produced by a stretched string has a fundamental frequency of 400Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is Options:
  A) 200Hz
  B) 400Hz
  C) 800Hz
  D) 1600Hz
  Show Answer
  The correct answer is B .
• Question 729: The eye controls the amount of light reaching the retina by adjusting the Options:
  A) cornea
  B) iris
  C) retina
  D) optic nerve
  Show Answer
  The correct answer is B .
• Question 730:

  

  The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

  Options:
  A) S-S poles
  B) S-N poles
  C) N-S poles
  D) N-N poles
  Show Answer
  The correct answer is A .