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 561: A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5] Options:
  A) 300.0°
  B) 48.6°
  C) 60.0°
  D) 75.5°
  E) 105.0 °
  Show Answer
  The correct answer is B .
• Question 562:

  The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20º and 80ºC respectively is?

  Options:
  A) 3.0 x 10${}^2$km${}^{-1}$
  B) 3.0 x 10${}^3$km${}^{-1}$
  C) 5.0 x 10${}^3$km${}^{-1}$
  D) 3.0 x 10${}^4$km${}^{-1}$
  Show Answer
  The correct answer is B .
• Question 563: The correct expression for the potential at a point distance r from a charge q in an electric field is Options:
  A)

  _q2

  4πεor2

  
  B)

  _q2

  4πεor

  
  C)

  _q

  4πεor2

  
  D)

  _q

  4πεor

  
  Show Answer
  The correct answer is D .
• Question 564:

  

  From the diagram above, the inductive reactance and the resistance R are respectively

  Options:
  A) 50Ω and 45Ω
  B) 25Ω and 51Ω
  C) 20Ω and 50Ω
  D) 10Ω and 49Ω
  Show Answer
  The correct answer is D .
• Question 565: A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine Options:
  A) 80.0%
  B) 76.6%
  C) 66.7%
  D) 60.7%
  Show Answer
  The correct answer is C .
• Question 566: What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds? Options:
  A) 80Hz
  B) 600Hz
  C) 800Hz
  D) 1600Hz
  Show Answer
  The correct answer is C .
• Question 567: A load of 20N on a wire of cross-sectional area 8 x 10^-7m², produces an extension of 10m². calculate Young's modulus for the material of the wire if its length is 3m Options:
  A) 7.0 x 10¹¹Nm^-2
  B) 7.5 x 10¹¹Nm^-2
  C) 8.5 x 10¹¹Nm^-2
  D) 9.0 x 10¹¹Nm^-2
  Show Answer
  The correct answer is B .
• Question 568:

  The diagram shows a uniform meter rule AB which balances horizontally at the 90cm mark when a mass of 0.2kg is suspended from B. Calculate the mass of the meter rule.

  Options:
  A) 0.05kg
  B) 0.20kg
  C) 0.80kg
  D) 1.00kg
  Show Answer
  The correct answer is A .
• Question 569: A hot metal ball is suspended in the open air. As it cools it loses heat by Options:
  A) conduction only
  B) convection only
  C) radiation only
  D) conduction and convection
  E) convection and evaporation
  Show Answer
  The correct answer is B .
• Question 570: If the force of a charge of 0.2 coulomb in an electric field is 4N, then the electric field intensity of the field is Options:
  A) 0.8
  B) 0.8N/C
  C) 20.0N/C
  D) 4.2N/C
  E) 20.0N/C
  Show Answer
  The correct answer is C .