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 341: A machine has an efficiency of 60%. If the machine is required to overcome a load of 30 N with a force of 20 N calculate its mechanical advantage? Options:
  A) 0.7
  B) 0.9
  C) 1.5
  D) 2.5
  E) 10.0
  Show Answer
  The correct answer is C .
• Question 342: Momentum and Kinetic energy are conserved in Options:
  A) Inelastic collision
  B) Elastic collision
  C) Explosion
  D) Spacecraft
  Show Answer
  The correct answer is B .
• Question 343: A 24V potential difference is applied across a parallel combination of four 6-ohms resistor, The current in each resistor is Options:
  A) 1A
  B) 4A
  C) 16A
  D) 18A
  E) 36A
  Show Answer
  The correct answer is B .
• Question 344: In copper plating, a current of 0.5A is allowed for cathode area of 100cm². If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/^oC, density of copper = 10^-4g/cm³ ) Options:
  A) 10^-2mm
  B) 10^-3mm
  C) 10^-4mm
  D) 10^-5mm
  E) 10^-6mm
  Show Answer
  The correct answer is E .
• Question 345: The general equation of a wave CANNOT be written as Options:
  A) y = A Sin [2 π ($\frac{t}{T}$ ± Xλ)]
  B) y = A Sin [wt ± kx]
  C) y = A Sin [2 $\frac{\pi }{\lambda }$ (vt ± x)]
  D) y = A Sin [2π (ft ± $\frac{X}{\lambda }$ )]
  E) y = A Sin 2 π f(T ± $\frac{X}{\lambda }$)]
  Show Answer
  The correct answer is E .
• Question 346: The correct unit of energy density is? Options:
  A) kg m³ s^-2
  B) kg m² s^-2
  C) kg m^-3 s^-2
  D) kg m^-1 s^-2
  Show Answer
  The correct answer is D .
• Question 347:

  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 348: Steel is more suitable for permanent magnet than iron because the former Options:
  A) is easily demagnetized by shaing vigorously
  B) is an alloy of many metals
  C) is easily magnetized by alternating current through one cycle
  D) retains magnetism more than iron
  Show Answer
  The correct answer is D .
• Question 349: When the volume of a given mass of gas is halved and its temperature doubled, the pressure Options:
  A) remains constant
  B) increases by a factor of 4
  C) increases by a factor of 3
  D) decreases by a factor of 4
  Show Answer
  The correct answer is B .
• Question 350: The property of the eye known as its power of accommodation is controlled by the Options:
  A) pupil
  B) virteous humour
  C) iris
  D) ciliary muscles
  Show Answer
  The correct answer is D .