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 1821: The photocell works on the principle of the Options:
  A) voltaic cell
  B) emision of electrons by incident radiation
  C) emision of protons by incident electrons
  D) photographic plate
  Show Answer
  The correct answer is B .
• Question 1822: An object of mass 100g projected vertically upwards from the ground level has a velocity of 20ms^-1 at a height of 10m. calculate its initial kinetic energy at the ground level.[g = 10ms^-2, neglect air resistance] Options:
  A) 10 J
  B) 20 J
  C) 30 J
  D) 50 J
  Show Answer
  The correct answer is C .
• Question 1823: A drop of petrol makes a finger colder than a drop of water would because? Options:
  A) petrol takes its latent heat of veporization from the finger
  B) petrol takes its latent heat of fusion from the finger
  C) water is more viscious than petrol
  D) water has higher surface tension dan petrol
  Show Answer
  The correct answer is A .
• Question 1824: The major difference between a pure semiconductor and a pure metal is that Options:
  A) metals are harder than semiconductor
  B) while resistance of metals decrease with temperature , the reverse is the case for semiconductor
  C) the resistance of metals increases with temperature, while for semiconductors, it is the reverse
  D) metals have forbidden gaps while semiconductors have not
  Show Answer
  The correct answer is C .
• Question 1825: Primary colours of light are Options:
  A) Red, blue and green
  B) Cyan, magneta and yellow
  C) Black, blue and green
  D) None of these colours
  Show Answer
  The correct answer is A .
• Question 1826: 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 1827: At what respective values of X, Y and Z would the unit of force, the newton, be dimensionally equivalent to M^xL^yT^z? Options:
  A) -1, 1, 2
  B) 1, 1, -2
  C) 1, -1, 2
  D) -1, 1, -2
  Show Answer
  The correct answer is B .
• Question 1828: A body of mass 36kg falls through a viscous liquid which offers a drag force of 260N on the body. The upthrust on the body at terminal velocity is?
  [g = 10ms²] Options:
  A) 100N
  B) 620N
  C) 50N
  D) 310N
  Show Answer
  The correct answer is A .
• Question 1829:

  A mass of 5kg is suspended from the ceiling of a lift with a light inextensible string. As the lift moves upwards with an acceleration of 2ms^-2, the tension in the string is [g = 10ms^-2]

  Options:
  A) 25N
  B) 40N
  C) 50N
  D) 60N
  E) 70N
  Show Answer
  The correct answer is D .
• Question 1830: a lead bullet of mass 0.05kg is fired with a velocity of 200ms^-1 into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is Options:
  A) 50 J
  B) 100 J
  C) 150 J
  D) 200 J
  Show Answer
  The correct answer is A .