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 771: If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is Options:
  A) doubled
  B) reduced to a quarter
  C) reduced by half
  D) constant
  Show Answer
  The correct answer is B .
• Question 772: The melting point of naphthalene is 78^oC. What is this temperature in kelvin Options:
  A) 100k
  B) 351k
  C) 378k
  D) 444k
  Show Answer
  The correct answer is B .
• Question 773:

  A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms-1, how much closer is the ship to the cliff?

  Options:
  A) 10m
  B) 350m
  C) 175m
  D) 125m
  Show Answer
  The correct answer is D .
• Question 774:

  A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action isdue to?

  Options:
  A) convection
  B) osmosis
  C) capillarity
  D) diffusion
  Show Answer
  The correct answer is D .
• Question 775: At constant pressure, the density of a fixed mass of gas is Options:
  A) constant with temperature
  B) proportional to its volume
  C) inversely proportional to its temperature
  D) independent of its volume
  Show Answer
  The correct answer is C .
• Question 776:

  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 777:

  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 778: If two parallel conductors carry currents flowing in the same direction, the conducts will Options:
  A) attract each other
  B) repel each other
  C) both move in the same direction
  D) have no effect on each other
  Show Answer
  The correct answer is A .
• Question 779:

  

  Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2

  Options:
  A) ${30}^{\circ }$
  B) ${45}^{\circ }$
  C) ${60}^{\circ }$
  D) ${90}^{\circ }$
  Show Answer
  The correct answer is C .
• Question 780: Which of the following is NOT a force? Options:
  A) Friction
  B) Tension
  C) Upthrust
  D) Weight
  E) Impulse
  Show Answer
  The correct answer is E .