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 781: Two insulated charged spheres of different sizes and carrying opposite charges are connected together by a metallic conductor. Current will flow from one sphere to the other until both sphere Options:
  A) carry the same magnitude and sign of charge
  B) are at the same potential
  C) are at the same temperature
  D) are of the same size
  Show Answer
  The correct answer is B .
• Question 782: The efficiency of a machine is always less than 100% because the Options:
  A) work output is always greater than the work input
  B) load lifted is always greater than the effort applied
  C) effort applied is always greater than the load lifted
  D) velocity ratio is always greater than the mechanical advantage
  Show Answer
  The correct answer is D .
• Question 783: An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is Options:
  A) 1.0N
  B) 3.0N
  C) 4.0N
  D) 5.0N
  Show Answer
  The correct answer is B .
• Question 784: Heat losses to the surrounding is possible through the following except Options:
  A) Conduction
  B) Convection
  C) Radiation
  D) Expansion
  Show Answer
  The correct answer is D .
• Question 785: The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased? Options:
  A) 0.25
  B) 0.5
  C) 1.66
  D) 2
  E) 4
  Show Answer
  The correct answer is D .
• Question 786: 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 787: Which of the following is not a mechanical wave? Options:
  A) wave in closed pipe
  B) radio waves
  C) water waves
  D) sound waves
  Show Answer
  The correct answer is B .
• Question 788: In the normal use of a simple microscope, a person sees an Options:
  A) erect, real and magnified image
  B) erect, virtual and magnified image
  C) inverted, virtual and magnified image
  D) inverted, real and magnified image
  E) inverted and real image the same size as the object
  Show Answer
  The correct answer is B .
• Question 789:

  0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg${}^1$ Cº. Calculate the specific latent heat of fusion of ice.

  Options:
  A) 9.0kjkg${}^{-1}$
  B) 84.0kjkg${}^{-1}$
  C) 134.0kjkg${}^{-1}$
  D) 168.0kjkg${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 790: When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is Options:
  A) 1200W
  B) 600W
  C) 120W
  D) 30W
  Show Answer
  The correct answer is A .