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 1621:

  

  In the curve above, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is

  Options:
  A) 25s
  B) 1/50s
  C) 1/100s
  D) 1/200s
  Show Answer
  The correct answer is C .
• Question 1622: If a body mass 5kg is thrown vertically upwards with velocity u,at what height will the potential energy equal to the kinetic energy? Options:
  A) h =(u)²/g
  B) h = (u)²/4g
  C) h = (2u)²/g
  D) h = (u)²/2g
  Show Answer
  The correct answer is B .
• Question 1623: A vapour is said to be saturated when Options:
  A) a dynamic equilibrium exists between liquid molecules and the vapour molecules
  B) a dynamic aquilibrium exists such that more molecules return to the liquid than are living it
  C) the temperature of the vapour varies
  D) the vapour pressure is atmospheric
  Show Answer
  The correct answer is A .
• Question 1624: From the generating station to each substation power is transmitted at a very high voltage so as to reduce Options:
  A) hysteresis loss
  B) eddy current loss
  C) magnetic flux leakage
  D) heating in the cells
  Show Answer
  The correct answer is B .
• Question 1625:
  

  The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40${}^o$, then the value of W is

  Options:
  A) 28.0N
  B) 48.0N
  C) 288.0N
  D) 50.0N
  Show Answer
  The correct answer is D .
• Question 1626: A 5kg block is released from rest on a smooth plane inclined at an angle of 30^o to the horizontal. What is the acceleration down the plane? [g = 10ms^-2] Options:
  A) 5.0 ms^-2
  B) 5.8 ms^-2
  C) 8.7 ms^-2
  D) 25.0 ms^-2
  Show Answer
  The correct answer is A .
• Question 1627: An insulated rod when rubbed with a material acquires Options:
  A) a negative charge if it is made of glass and rubbed with silk
  B) no charge if it is made of glass and rubbed with fur
  C) no charge if it is made of copper and rubbed with silk
  D) a positive charge if it is made of copper and rubbed with fur
  Show Answer
  The correct answer is B .
• Question 1628:

  A microscope is focused on a mark on a table, when the mark is covered by a plate of glass 2m thick, the microscope has to be raised 0.67cm for the mark to be once more in focus. Calculate the refractive index.

  Options:
  A) 1.52
  B) 1.68
  C) 2.58
  D) 1.82
  Show Answer
  The correct answer is A .
• Question 1629:

  A 2H inductor has negligible resistance and is connected to a $\frac{50}{\pi }$ Hz A.C supply. The reactance of the inductor is?

  Options:
  A) 200$\mathrm{\Omega }$
  B) 50$\mathrm{\Omega }$
  C) $\frac{100}{\pi }$
  D) $\frac{25}{\pi \mathrm{\Omega }}$
  Show Answer
  The correct answer is A .
• Question 1630: The net charge on the atom is zero because Options:
  A) the electrons and the protons that are charged are in the nucleus
  B) the total charge on the electrons is equal to the total charge on the protons
  C) the neutrons from a shield around the charged protons
  D) the number of electrons in an atom is half the number of protons
  E) A and B above
  Show Answer
  The correct answer is B .