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 2171:

  

  In the above circuit, The fuse wire melts when

  Options:
  A) K is Opened
  B) K is closed
  C) the 14 ohm resistor is doubled with k closed
  D) the 6 ohm resistor is doubled with k closed
  Show Answer
  The correct answer is B .
• Question 2172: The unit of quantity of electricity is called Options:
  A) the ampere
  B) the volts
  C) the coulomb
  D) the ammeter
  E) electromotive force
  Show Answer
  The correct answer is C .
• Question 2173: 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 2174:

  

  The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

  Options:
  A) At J, the wire becomes plastic
  B) J is the yield point
  C) L is the elastic limit
  D) At K, the wire breaks
  Show Answer
  The correct answer is B .
• Question 2175: The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 0f 30^o with the resultant, find its magnitude. Options:
  A) 100.0N
  B) 57.7N
  C) 43.3N
  D) 25.0N
  Show Answer
  The correct answer is C .
• Question 2176: The graphite rods surrounding the uranium fuel rods in a nuclear reactor, are used to Options:
  A) absorb the neutrons and hence halt the nuclear process
  B) create the neutrons and hence slow up the nuclear process
  C) slowdown the neutrons and hence slow up the nuclear process
  D) speed up the neutrons and hence speed up the nuclear process
  Show Answer
  The correct answer is C .
• Question 2177: A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours? Options:
  A) 1/32
  B) 1/16
  C) 1/8
  D) 1/4
  E) 1/2
  Show Answer
  The correct answer is B .
• Question 2178: The total energy required to send a unit positive charge round a complete electrical circuit is the Options:
  A) kinetic energy
  B) potential difference
  C) electromotive force
  D) electrical energy
  Show Answer
  The correct answer is B .
• Question 2179: A 20kg mass is to be pulled up a slope inclined at 30^o to the horizontal. If the efficiency of the plane is 75%, the force required to pull the load up the plane is [g = 10ms^-2] Options:
  A) 13.3N
  B) 73.5N
  C) 133.3N
  D) 53.2N
  Show Answer
  The correct answer is C .
• Question 2180:

  The volume of 0.354g of helium at 273°C and 114cm of mercury pressure is 2667cm${}^3$. Calculate the volume

  Options:
  A) 2000.25 cm${}^3$
  B) 200.025 cm${}^3$
  C) 4003.27 cm${}^3$
  D) 2010.25 cm${}^3$
  Show Answer
  The correct answer is B .