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 1971:

  The density of 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gcm^-3 after frying, assuming no loss of oil due to spilling, its new volume was?

  Options:
  A) 1360cm${}^3$
  B) 600cm${}^3$
  C) 240cm${}^3$
  D) 8000m${}^3$
  Show Answer
  The correct answer is B .
• Question 1972: 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 1973:

  A generator manufacturing company accidentally made an AC generator instead of a DC generator. To fix this error,

  Options:
  A) the magnetic field needs to be made stronger
  B) the split rings should be replaced with slip rings
  C) the number of turns of the armature coil needs to be decreased
  D) the slip rings should be replaced with split rings
  Show Answer
  The correct answer is D .
• Question 1974: The dimension of universal gravitational constant is……….? Options:
  A) ­$M{­}^{–1}{L}^3{T}^{–2}$
  B) ML³T²
  C) ML³
  D) MLT^-2
  Show Answer
  The correct answer is A .
• Question 1975:

  The number of holes in an intrinsic semiconductor

  Options:
  A) is not equal to the number of free electrons
  B) is greater than the number of free electrons
  C) is equal to the number of free electrons
  D) is less than the number of free electrons
  Show Answer
  The correct answer is C .
• Question 1976: In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the Options:
  A) load and the extension
  B) load and the radius of the wire
  C) radius of the wire and the extension
  D) extension and the original length of the wire
  Show Answer
  The correct answer is B .
• Question 1977: Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny particles carrying negative electric charges. ii. they are deflected in a magnetic field but not in an electric field. iii. they consist of fast moving neutrons and deflected in an electric field. Options:
  A) i only
  B) ii only
  C) i and ii only
  D) ii and iii only
  Show Answer
  The correct answer is A .
• Question 1978:
  

  On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

  Options:
  A) 70
  B) 62
  C) 80
  D) 42
  Show Answer
  The correct answer is A .
• Question 1979: An object of mass 50kg is released from a height of 2m.Find the kinetic energy just before it strikes the ground Options:
  A) 250J
  B) 1000J
  C) 10 000J
  D) 100 000J
  Show Answer
  The correct answer is B .
• Question 1980:

  A man swung an object of mass 2 kg in a circular path with a rope 1.2 m long. If the object was swung at 120 rev/min, find the tension in the rope.

  Options:
  A) 400 N
  B) 288 N
  C) 240 N
  D) 379 N
  Show Answer
  The correct answer is D .