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 2451:

  A mixture of blue and red pigment when illuminated by white light will appear

  Options:
  A) green
  B) orange
  C) purple
  D) magenta
  Show Answer
  The correct answer is C .
• Question 2452: A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is Options:
  A) 90%
  B) 80%
  C) 85%
  D) 87%
  Show Answer
  The correct answer is B .
• Question 2453:

  A 1000kg elevator is descending vertically with an acceleration of 1.0ms^-2, if the acceleration due to gravity is 10ms^-2, the tension in the suspending cable is

  Options:
  A) 1.0N
  B) 10.0N
  C) 9000.0N
  D) 11000N
  Show Answer
  The correct answer is C .
• Question 2454: A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 10⁶Jkg^-1] Options:
  A) 1.15 x 10⁹ s
  B) 1.15 x 10⁷ s
  C) 1.15 x 10⁵ s
  D) 1.15 x 10⁴ s
  Show Answer
  The correct answer is D .
• Question 2455: A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80JK^-1 containing water of heat capacity 420JK^-1 at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal. Options:
  A) 877Jkg^-1K^-1
  B) 286Jkg^-1K^-1
  C) 133Jkg^-1K^-1
  D) 92Jkg^-1K^-1
  Show Answer
  The correct answer is C .
• Question 2456:

  

  The correct position for a fuse in the diagram above is

  Options:
  A) between P and Q
  B) Q
  C) S
  D) P
  Show Answer
  The correct answer is D .
• Question 2457: A 0 - 10mA galvanometer with a coil resistance of 30$\mathrm{\Omega }$ can be converted to a 0 - 10A ammeter by using Options:
  A) 0.03$\mathrm{\Omega }$ series resistor
  B) 0.03$\mathrm{\Omega }$ shunt resistor
  C) 9.99$\mathrm{\Omega }$ shunt resistor
  D) 9.99$\mathrm{\Omega }$ series resistor
  Show Answer
  The correct answer is B .
• Question 2458:

  A device that converts sound energy into electrical energy is

  Options:
  A) the horn of a motor car
  B) an A.C. generator
  C) a microphone
  D) the telephone
  E) radio waves
  Show Answer
  The correct answer is C .
• Question 2459: The vibration of an air column produces the sound in the Options:
  A) piano
  B) guiter
  C) flute
  D) school handbell
  Show Answer
  The correct answer is C .
• Question 2460: A platinum resistance thermometer records 3.0$\mathrm{\Omega }$ at 0^oC and 8.0$\mathrm{\Omega }$ at 100^oC. If it records 6.0$\mathrm{\Omega }$ in a certain environment, The temperature of the medium is Options:
  A) 80^oC
  B) 60^oC
  C) 50^oC
  D) 30^oC
  Show Answer
  The correct answer is B .