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 381: If silicon is doped with phosphorus, what type of semiconductor material will be formed? Options:
  A) Zener material
  B) P-n junction
  C) n-type
  D) p-type
  Show Answer
  The correct answer is C .
• Question 382:

  Electrical appliances in homes are normally earthed so that

  Options:
  A) a person touching the appliances is safe from electric shock
  B) both the a.c. and d.c. sources can be used
  C) the appliances are maintained at a higher pd than the earth
  D) the appliances are maintained at a lower pd than the earth
  Show Answer
  The correct answer is A .
• Question 383: 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 384: The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at Options:
  A) 2.7m
  B) 2.0m
  C) 2.3m
  D) 2.5m
  Show Answer
  The correct answer is A .
• Question 385: The linear expansivity of brass is 2 x 10^-5oC^-1. If the volume of a piece of brass is 10cm³ at 0^oC, what will be its volume at 100^oC? Options:
  A) 10.02cm³
  B) 10.04cm³
  C) 10.06cm³
  D) 10.20cm³
  E) 102.00cm³
  Show Answer
  The correct answer is C .
• Question 386:

  

  The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field

  Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is C .
• Question 387: To determine the weight of an object you could Options:
  A) use a beam balance
  B) use a spring balance
  C) find the force necessary
  D) use none of these methods
  E) use any of these methods
  Show Answer
  The correct answer is E .
• Question 388: Which of the following electromagnetic waves has the shortest wavelength? Options:
  A) Radio waves
  B) X-rays
  C) Infra-red
  D) Blue light
  E) Ultraviolet
  Show Answer
  The correct answer is B .
• Question 389: In a fission process, the decrease in mass is 0.01%. How much energy could be obtained from the fission of 0.1g of the material Options:
  A) $9.0\times {10}^{9}J$
  B) $9.0\times {10}^{10}J$
  C) $6.3\times {10}^{11}J$
  D) $9.0\times {10}^{11}J$
  Show Answer
  The correct answer is A .
• Question 390: A magnetic field is said to exist at a point if a force is Options:
  A) exerted on a stationary charge at the point
  B) exerted on a moving charge at the point
  C) deflected at the point
  D) strengthened at the point
  Show Answer
  The correct answer is B .