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 131: Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 10³Hz oscillator. Options:
  A) 39.0$\mathrm{\Omega }$
  B) 122.5$\mathrm{\Omega }$
  C) 245.0$\mathrm{\Omega }$
  D) 39000.0$\mathrm{\Omega }$
  Show Answer
  The correct answer is C .
• Question 132:

  

  A block of mass m is held in equilibrium against a vertical wall by a horizontal force. If the coefficient of friction between the wall and the block is µ, the minimum value of the horizontal force is

  Options:
  A) µmg
  B) (1-µ)mg
  C) (1+µ)mg
  D) mg/µ
  Show Answer
  The correct answer is D .
• Question 133: Eight alpha decays and six beta decays are necessary before an atom of 2 ${}_{92}^{238}U$ achieves stability. The final product in the chain has an atomic number of Options:
  A) 70
  B) 78
  C) 82
  D) 90
  Show Answer
  The correct answer is C .
• Question 134: Under constant tension and constant mass per unit length, the note produced by a plucked string is 500Hz when the length of the string is 0.90m. At what length is the frequency 150Hz? Options:
  A) 3m
  B) 4m
  C) 5m
  D) 6m
  Show Answer
  The correct answer is A .
• Question 135:

  

  A uniform light beam XZ is Hinged at X and kept in equilibrium by the forces T and F as shown in the diagram above. if XO = 20m and OY = 30cm, express T in terms of F

  Options:
  A) T =2√3/3
  B) T= 2F
  C) T = 5V3F/3
  D) T = 5F
  Show Answer
  The correct answer is D .
• Question 136:

  The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .
• Question 137:

  Which of the following media allow the transmission of sound waves through them?

  I. air

  II. liquid

  III. solids

   

  Options:
  A) I and II only
  B) I and III only
  C) II and III only
  D) I, II and III
  Show Answer
  The correct answer is D .
• Question 138: A semiconductor diode is used in rectifying alternating current into direct current mainly because it Options:
  A) allows current to flow in either direction
  B) is non-linear
  C) offers a high input resistance
  D) allows current to flow only in one direction
  Show Answer
  The correct answer is D .
• Question 139: A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is Options:
  A) 1 . 25 x 10⁴ W
  B) 2 . 50 x 10⁴ W
  C) 1 . 25 x 10⁶W
  D) 2 . 50 x 10⁶ W
  Show Answer
  The correct answer is B .
• Question 140: In a gas experiment, if the volume of the gas is plotted against the reciprocal of the pressure, the unit of the slope of the resulting curve is Options:
  A) force
  B) temperature
  C) power
  D) work
  Show Answer
  The correct answer is D .