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 1751: Which of the following statements is correct about a machine? Options:
  A) Efficiency of a machine is always greater than I
  B) Efficiency decreases with an increase in friction
  C) Velocity ratio depends on friction
  D) Mechanical advantage increases with an increase in friction
  Show Answer
  The correct answer is B .
• Question 1752: A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil. Options:
  A) 200
  B) 100
  C) 250
  D) 150
  Show Answer
  The correct answer is A .
• Question 1753: The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels Options:
  A) mainly through air
  B) fainter in stretched string
  C) faster through gases than in solids and liquids
  D) with greater ease through a string than in air
  E) none of the above is correct
  Show Answer
  The correct answer is D .
• Question 1754: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1] Options:
  A) 840J
  B) 3360J
  C) 3420J
  D) 4200J
  E) 7560J
  Show Answer
  The correct answer is E .
• Question 1755: Which of the following is a pure semiconductor? Options:
  A) carbon
  B) silicon
  C) transistor
  D) phosphorus
  Show Answer
  The correct answer is B .
• Question 1756: A positive charged rod X is brought near as uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that y has Options:
  A) no charge and a zero potential
  B) a positive charge and zero potential
  C) a negative charge and positive potential
  D) a negative charge and a negative potential
  Show Answer
  The correct answer is D .
• Question 1757:

  A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

  Options:
  A) 3 rev s^-1
  B) 40 rev s^-1
  C) 360 rev s^-1
  D) 2400 rev s^-1
  Show Answer
  The correct answer is B .
• Question 1758: Which of the following pairs is an example of translucent bodies? Options:
  A) Cardboard and moon
  B) Clear water and glass
  C) Frosted glass and waxed paper
  D) Oiled paper and brick
  E) Wood and metal sheet
  Show Answer
  The correct answer is C .
• Question 1759: Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length Options:
  A) i only
  B) ii only
  C) iii only
  D) i and iii
  E) ii and iii
  Show Answer
  The correct answer is C .
• Question 1760: 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 .