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 1171: A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s^-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is Options:
  A) 8V
  B) 16V
  C) 20V
  D) 80V
  Show Answer
  The correct answer is D .
• Question 1172: A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4. Options:
  A) 343.32N
  B) 233.33N
  C) 333.33N
  D) 334.33N
  Show Answer
  The correct answer is C .
• Question 1173:

  

  In the series a.c circuit shown above, the p.d across the inductor is 8V_r.m.s and that across the resistor is 6V_r.m.s. The effective voltage is

  Options:
  A) 2V
  B) 10V
  C) 14V
  D) 48V
  Show Answer
  The correct answer is B .
• Question 1174: 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 1175: Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad^-1. If the radius of the blade is 0.2m, the centripetal force is Options:
  A) 2 N
  B) 20 N
  C) 200 N
  D) 400 N
  Show Answer
  The correct answer is B .
• Question 1176: Which of the following is in a neutral equilibrium? Options:
  A) a heavy weight suspended on a string
  B) a cone resting on its slant edge
  C) a heavy-based table lamp
  D) the beam of a balance in use
  Show Answer
  The correct answer is B .
• Question 1177: Which of the following is a characteristics of stationary waves? Options:
  A) They are formed by two identical waves travelling in opposite directions
  B) they can be transverse or longitudinal
  C) The distance between two successive nodes is one wavelenght
  D) The antinode is a point of minimum displacement
  Show Answer
  The correct answer is A .
• Question 1178: An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole? Options:
  A) 3.0 cm
  B) 8.0 cm
  C) 12.0 cm
  D) 16.0 cm
  Show Answer
  The correct answer is C .
• Question 1179:

  Which of the units of the following physical quantities are derived?

  I. Area
  II. Thrust
  III. Pressure
  IV. Mass

  Options:
  A) I, II, III and IV
  B) I, II, and III only
  C) I, II, and IV only
  D) I and IV only
  Show Answer
  The correct answer is B .
• Question 1180: The correct expression for the potential at a point distance r from a charge q in an electric field is Options:
  A)

  _q2

  4πεor2

  
  B)

  _q2

  4πεor

  
  C)

  _q

  4πεor2

  
  D)

  _q

  4πεor

  
  Show Answer
  The correct answer is D .