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 71: When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as Options:
  A) photoelectric effect
  B) thermionic emission
  C) field emission
  D) secondary emission
  E) radioactive emission
  Show Answer
  The correct answer is B .
• Question 72: What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm? Options:
  A) Compound microscope
  B) Galileo's telescope
  C) Terrestrial telescope
  D) Astronomical telescope
  Show Answer
  The correct answer is D .
• Question 73:

  

  The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction

  Options:
  A) parallel to OX
  B) parallel to OY
  C) 60^o to OX
  D) 60v to OY
  Show Answer
  The correct answer is B .
• Question 74:

  In an AC circuit, resonance occurs when the impedance of the circuit is:

  Options:
  A) Zero
  B) Maximum
  C) Equal to the capacitive reactance of the circuit
  D) Minimum
  Show Answer
  The correct answer is D .
• Question 75: Which of the following is used in a nuclear reactor to slow down fast moving neutrons? Options:
  A) graphite rods
  B) carbon dioxide gas
  C) liquid sodium metal
  D) concrete shield
  E) boron rods
  Show Answer
  The correct answer is A .
• Question 76:

  23	Na + X →	20	F +	4	He
  11		9		2

  What particle is X in the reaction above?

  Options:
  A) Alpha
  B) Beta
  C) Neurons
  D) Gamma
  Show Answer
  The correct answer is C .
• Question 77: The pressure of a given mass of a gas changes from 200Nm^-2 to 120Nm^-2 while the temperature drops from 127°C to -73°C. The ratio of the final volume to the initial volume is Options:
  A) 2 : 5
  B) 5 : 4
  C) 5 : 2
  D) 4 : 5
  Show Answer
  The correct answer is B .
• Question 78:

  If an object whose mass is 3kg moves in a circular path of a radius of 0.7m, and records a speed at 2m/s, what is the result of the angular velocity?

  Options:
  A) 4 rads^–1
  B) 1 rads^–1
  C) 3 rads^–1
  D) 2 rads^–1
  Show Answer
  The correct answer is C .
• Question 79: An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe, the frequency of the note is Options:
  A) ^2v/_t
  B) ^v/_5t
  C) ^v/_4t
  D) ^v/_2t
  Show Answer
  The correct answer is C .
• Question 80: 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 .