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 31: The core of an efficient transformer should consist of laminated pieces of metal in order to Options:
  A) increase the heat produced by increasing the eddy current
  B) increase the heat produced by reducing the eddy current
  C) reduce the heat produced by increasing the eddy current
  D) reduce the heat produced by reducing the eddy current
  Show Answer
  The correct answer is D .
• Question 32: Two rays of light from a point below the surface of water are equally inclined to each other at 60^o in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be $\frac{4}{3}$) Options:
  A) 41.8^o
  B) 44.1^o
  C) 60.0^o
  D) 83.6^o
  E) 120.0^o
  Show Answer
  The correct answer is D .
• Question 33: The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is Options:
  A) longer than 700nm
  B) shorter than 700nm but longer then 400nm
  C) 550nm
  D) shorter than 400nm
  E) infinite
  Show Answer
  The correct answer is D .
• Question 34:

  

  In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to

  Options:
  A) 0.5 ohm
  B) 0.62 ohm
  C) 1.0 ohm
  D) 2.0 ohm
  E) 3.0 ohm
  Show Answer
  The correct answer is D .
• Question 35: 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 36:

  

  Fig 10 above shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

  Options:
  A) 30
  B) 35
  C) 70
  D) 24.25
  E) impossible to find
  Show Answer
  The correct answer is A .
• Question 37: A constant force of magnitude F acts on an object of mass 0.04kg initially at rest at a point O. if the speed of the object when it has moved 50m from O is 500ms^-1, what is the value of F? Options:
  A) 0.4N
  B) 100.0N
  C) 250.0N
  D) 1000.0N
  Show Answer
  The correct answer is B .
• Question 38: 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 39: The space surrounding a magnet in which the magnetic force is exerted is Options:
  A) magnetic field
  B) magnetic flux
  C) magnetic point
  D) magnetic pole
  E) magnetic strength
  Show Answer
  The correct answer is A .
• Question 40:

  

  PQ is a thin rod on a horizontal table, RS is a plane mirror inclined at ${45}^{\circ }C$ to the horizontal as shown above. The image of PQ as seen in the mirror by the eye T is

  Options:
  A) horizontal
  B) parallel to the mirror
  C) at infinity
  D) vertical
  E) highly magnified
  Show Answer
  The correct answer is B .