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 841:

  A ball of mass 0.5kg moving at 10ms${}^{-1}$ collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

  Options:
  A) 0.2ms${}^{-1}$
  B) 0.5ms${}^{-1}$
  C) 5.0ms${}^{-1}$
  D) 5.5ms${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 842: An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater. Options:
  A) 0.25 W
  B) 4.00 W
  C) 38.40W
  D) 60.00W
  Show Answer
  The correct answer is D .
• Question 843: A piece of wood of mass 40g and uniform cross-sectional area of 2cm² floats upright in water. The length of the wood immersed is Options:
  A) 30cm
  B) 40cm
  C) 20cm
  D) 2cm
  Show Answer
  The correct answer is C .
• Question 844: An object is placed in front of two plane mirrors inclined at an angle of 0^o. If the total number of images formed is 7, Find the value of $\theta$ Options:
  A) 30^o
  B) 45^o
  C) 51^o
  D) 90^o
  Show Answer
  The correct answer is B .
• Question 845: One special advantage of alcohol over mercury as a thermometric liquid is its Options:
  A) low density
  B) low freezing point
  C) high specific
  D) low boiling point
  Show Answer
  The correct answer is B .
• Question 846:

  

  The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is

  Options:
  A) 60%
  B) 50%
  C) 40%
  D) 33%
  Show Answer
  The correct answer is B .
• Question 847: The operation of an optical fibre is based on the principal of Options:
  A) dispersion of light
  B) interference of light
  C) refraction of light
  D) polarization of light
  Show Answer
  The correct answer is C .
• Question 848: A 0.05kg bullet travelling at 500ms^-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet? Options:
  A) 25N
  B) 50N
  C) 250N
  D) 500N
  E) 25 000N
  Show Answer
  The correct answer is E .
• Question 849: THe velocity of sound in air at 16^oC is 340ms^-1. What will it be when the pressure is doubled and its temperature raised to 127^oC? Options:
  A) 400 ms^-1
  B) 4,000 ms^-1
  C) 8,000 ms^-1
  D) 160,000 ms^-1
  Show Answer
  The correct answer is A .
• Question 850: The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60^o is Options:
  A) 25W
  B) 50W
  C) 120W
  D) 125W
  Show Answer
  The correct answer is A .