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 1481: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1] Options:
  A) 840J
  B) 3360J
  C) 3420J
  D) 4200J
  E) 7560J
  Show Answer
  The correct answer is E .
• Question 1482: The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth? Options:
  A) 1.92N
  B) 2.88N
  C) 6.72N
  D) 8.00N
  E) 12.00N
  Show Answer
  The correct answer is E .
• Question 1483: How many grams of water at 17^oC must be added to 42g of ice at 0^oC to melt the ice completely? [specific latent heat of fusion of ice = 3.4 x 10⁵Jkg^-1, specific heat capacity of water = 4200Jkg^-1k^-1] Options:
  A) 200g
  B) 300g
  C) 320g
  D) 400g
  Show Answer
  The correct answer is A .
• Question 1484: The efficiency of a machine is always less than 100% because the Options:
  A) work output is always greater than the work input
  B) load lifted is always greater than the effort applied
  C) effort applied is always greater than the load lifted
  D) velocity ratio is always greater than the mechanical advantage
  Show Answer
  The correct answer is D .
• Question 1485: A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is Options:
  A) 200C
  B) 50C
  C) 12C
  D) 0.002C
  Show Answer
  The correct answer is C .
• Question 1486: A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is Options:
  A) 5 volts
  B) 10 volts
  C) 15 volts
  D) 20 volts
  E) 25 volts
  Show Answer
  The correct answer is B .
• Question 1487: A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain? Options:
  A) 60
  B) 6
  C) 6 x 10^-2
  D) 6 x 10^-3
  E) 0.6
  Show Answer
  The correct answer is C .
• Question 1488: A pool of water appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.33, what is the actual depth of the pool? Options:
  A) 0.750m
  B) 1.013m
  C) 1.330m
  D) 13.3000m
  Show Answer
  The correct answer is C .
• Question 1489:

  Two bodies have masses in the ratio3:1. They experience forces whichimpart to them,acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced

  Options:
  A) 1:4
  B) 2:1
  C) 2:3
  D) 2:5
  Show Answer
  The correct answer is C .
• Question 1490: A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second? Options:
  A) 81.00kg
  B) 9.00kg
  C) 0.90kg
  D) 0.09kg
  Show Answer
  The correct answer is C .