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 181: Which of the following can be used to reduce local action in a Laclanche cell? Options:
  A) A carbon rod as the positive pole
  B) Pure zinc as the negative pole
  C) Potassium permanganate solution in contact with the positive pole
  D) common salt solution
  Show Answer
  The correct answer is C .
• Question 182: A mass of gas at 7^oC and 70cm of mercury has a volume of 1200cm³. Determine its volume at 27^oC and pressure of 75cm of mercury. Options:
  A) 1200cm³
  B) 1378cm³
  C) 4320cm³
  D) 4629cm³
  Show Answer
  The correct answer is A .
• Question 183:

  

  A simple pendulum of mass m moves along an arc pf a circle radius R in a vertical plane as shown above. What is the work done by gravity in a downward swing through the angle q to 0 degree

  Options:
  A) mgR sinθ
  B) MgR (1- cos θ)
  C) mgR
  D) mgR (1 - sinθ)
  Show Answer
  The correct answer is B .
• Question 184: Which of the following has the lowest internal resistance when new? Options:
  A) leclanche cell
  B) Daniel cell
  C) Accumulator
  D) Torch battery
  Show Answer
  The correct answer is C .
• Question 185:

  If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

  Options:
  A) oscillation
  B) circular
  C) rotational
  D) rectilinear
  Show Answer
  The correct answer is B .
• Question 186: Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo Options:
  A) number of turns in the coil is increased
  B) strength of the field magnet is increased
  C) slip rings are replaced with split ring cummutator
  D) coil is wound on a soft iron armature
  Show Answer
  The correct answer is C .
• Question 187: Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30^o with the resultant, determine its magnitude. Options:
  A) 8.66N
  B) 50.0N
  C) 57.7N
  D) 86.6N
  Show Answer
  The correct answer is D .
• Question 188: 1kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [specific heat capacity of copper 400Jkg^-1K^-1 and latent heat of fusion of ice 333 x 10³Jkg^-1] Options:
  A) 60g
  B) 67g
  C) 120g
  D) 133g
  Show Answer
  The correct answer is C .
• Question 189: The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is Options:
  A) 1:80
  B) 1:320
  C) 1:1280
  D) 1:4
  Show Answer
  The correct answer is A .
• Question 190:

  The height at which the atmosphere cases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

  (ρm = 13.6g/cm${}^3$ ρ = 0.00013g/cm${}^3$ )

  Options:
  A) 380mmHg
  B) 570mmHg
  C) 190mmHg
  D) 480mmHg
  Show Answer
  The correct answer is B .