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 521: 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 522:

  

  From the diagram above, determine the value of the resistance X

  Options:
  A) 6Ω
  B) 9Ω
  C) 12Ω
  D) 15Ω
  Show Answer
  The correct answer is D .
• Question 523:

  The density of a certain oil on frying becomes

  0.4 kgm^-3 with the volume of 20m³. what will be its initial volume when its initial density is 0.8 kgm^-3 assuming no loss of oil due to spillage?

  Options:
  A) 12 kgm^-3
  B) 10 kgm^-3
  C) 8 kgm^-3
  D) 5 kgm^-3
  Show Answer
  The correct answer is B .
• Question 524: An empty density bottle weighs 2 N. if its weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is Options:
  A) (1)/3
  B) (2)/3
  C) (1)/5
  D) (2)/5
  Show Answer
  The correct answer is B .
• Question 525: Two cells each of e.m.f. 1.5V and an internal resistance 2$\mathrm{\Omega }$ are connected in parallel. Calculate the current flowing when the cells are connected to a 1$\mathrm{\Omega }$ resistor Options:
  A) 0.75$\mathrm{\Omega }$
  B) 1.5$\mathrm{\Omega }$
  C) 0.5$\mathrm{\Omega }$
  D) 1.0$\mathrm{\Omega }$
  E) 0.6$\mathrm{\Omega }$
  Show Answer
  The correct answer is A .
• Question 526: A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f. Options:
  A) 5.60 v
  B) 24.00 v
  C) 0.24 v
  D) 2.40 v
  Show Answer
  The correct answer is D .
• Question 527: Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is Options:
  A) 0.1μF
  B) 0.3μF
  C) 1.0μF
  D) 0.5μF
  Show Answer
  The correct answer is A .
• Question 528:

  A 1000kg elevator is descending vertically with an acceleration of 1.0ms^-2, if the acceleration due to gravity is 10ms^-2, the tension in the suspending cable is

  Options:
  A) 1.0N
  B) 10.0N
  C) 9000.0N
  D) 11000N
  Show Answer
  The correct answer is C .
• Question 529: A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r. Options:
  A) 4.5Ω
  B) 1.0Ω
  C) 8.0Ω
  D) 2.0Ω
  Show Answer
  The correct answer is D .
• Question 530:

  

  An air column 10cm in length is trapped into the sea end of a capillary tube by a 15cm column of mercury with the tube held vertically as shown above. On inverting the tube the air column becomes 15cm long. The atmospheric pressure during the experiment is

  Options:
  A) 90cm
  B) 76cm
  C) 75cm
  D) 60cm
  E) 50cm
  Show Answer
  The correct answer is B .