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 991:

  A man swung an object of mass 2 kg in a circular path with a rope 1.2 m long. If the object was swung at 120 rev/min, find the tension in the rope.

  Options:
  A) 400 N
  B) 288 N
  C) 240 N
  D) 379 N
  Show Answer
  The correct answer is D .
• Question 992:

  Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

  Options:
  A) heat ----> Light----> Sound ----> Kinetic
  B) Kinetic ----> Light ----> Heat ----> Electricity
  C) heat ----> Kinetic ----> Electricity ----> Heat and Light
  D) electricity ----> Kinetic ----> Heat ----> Light
  Show Answer
  The correct answer is C .
• Question 993:

  A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

  Options:
  A) boron and antimony
  B) aluminium and antimony
  C) aluminium and indium
  D) arsenic and antimony
  Show Answer
  The correct answer is D .
• Question 994:

  

  The diagram above shows a closed side 0.5m in a uniform electric field E in the direction shown by the arrows. What is the flux Φ for the box?

  Options:
  A) 0.5 E
  B) 2.0 E
  C) 0.2 E
  D) 0.0 E
  Show Answer
  The correct answer is D .
• Question 995: A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms^-2) Options:
  A) 10√2ms^-1
  B) 10ms^-1
  C) 100ms^-1
  D) 5√2ms^-1
  E) 200ms^-1
  Show Answer
  The correct answer is A .
• Question 996: The half-life of a radioactive substance is 2 seconds. Calculate the decay constant. Options:
  A) 2.890 s^-1
  B) 1 .445 s^-1
  C) 0.576 s^-1
  D) 0.347s^-1
  E) 0.152 s^-1
  Show Answer
  The correct answer is D .
• Question 997: Light of velocity 3 x 10⁸ms^-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 10⁸ms^-1 in the material, what is n? Options:
  A) 2.33
  B) 2.25
  C) 1.33
  D) 1.25
  Show Answer
  The correct answer is D .
• Question 998: If the refractive index of a medium in air is 2.0, what is the critical angle for this medium? Options:
  A) 30^o
  B) 42^o
  C) 45^o
  D) 50^o
  Show Answer
  The correct answer is A .
• Question 999: Which of the following instruments helps to maintain the correct humidity and temperature of a building? Options:
  A) A compressor
  B) A refrigerator
  C) Air blower
  D) Air conditioner
  Show Answer
  The correct answer is D .
• Question 1000: A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours? Options:
  A) 3.84k Wh
  B) 7.20k Wh
  C) 8.40k Wh
  D) 12.00k Wh
  E) 14.56k Wh
  Show Answer
  The correct answer is B .