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 791: Semiconductor is a class of solid whose conductivity increases with an increase in Options:
  A) Pressure
  B) Temperature
  C) Current
  D) Voltage
  Show Answer
  The correct answer is B .
• Question 792: At 35°C and 5 atmospheres pressure the density of a gas is 0. 600g per liter. What is the density at 7 atmospheric pressure and 350°C. Options:
  A) 0.27g / liters
  B) 0.25g / liters
  C) 17g / liters
  D) 0.15g / liters
  Show Answer
  The correct answer is C .
• Question 793: Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33) Options:
  A) 36.9°
  B) 41.3°
  C) 48.8°
  D) 49.2°
  E) 51.4°
  Show Answer
  The correct answer is C .
• Question 794: The eclipse of the sun occurs when the Options:
  A) moon is between the sun and the earth
  B) earth is between the sun and the moon
  C) moon is not completely hidden in the earth's shadow
  D) moon's umbra falls on some part of the earth
  Show Answer
  The correct answer is A .
• Question 795: The length of mercury thread when it is at 0^oC, 100^oC and at an unknown temperature $\theta$ is 25mm, 225mm and 175mm respectively. The value of $\theta$ is Options:
  A) 85.0^oC
  B) 80.0^oC
  C) 75.0^oC
  D) 70.0^oC
  Show Answer
  The correct answer is C .
• Question 796:

  A copper rod, 5m long when heated through 20c, expands by 1mm. If a second copper rod, 2.5m long is heated through 5c, by how much will it expand?

  Options:
  A) 4mm
  B) 2mm
  C) 0.25mm
  D) 0.12mm
  Show Answer
  The correct answer is B .
• Question 797: The angle between the magnetic meridian and the geographic meridian at a locality on the earth is the Options:
  A) longitude of the locality
  B) angle of inclination at the locality
  C) latitude of the locality
  D) angle of declination of the locality
  Show Answer
  The correct answer is D .
• Question 798:

  The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

  Options:
  A) angle of variation is zero
  B) magnetic declination is 90
  C) angle of dip is zero
  D) horizontal component at the Earth's field is zero
  Show Answer
  The correct answer is C .
• Question 799: A cone in an unstable equilibrium has its potential energy Options:
  A) decreased
  B) increased
  C) unchanged
  D) oscillating
  Show Answer
  The correct answer is B .
• Question 800: An a.c. generator can be converted into a d.c. generator by replacing Options:
  A) the slip rings with split-ring commutators
  B) the slip rings with armatures
  C) the split-rings with slip rings
  D) the split-rings with brushes
  E) the brushes with slip-ring commutators.
  Show Answer
  The correct answer is A .