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 951: Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple? Options:
  A) 1000 Nm
  B) 500 Nm
  C) 10 Nm
  D) 5 Nm
  E) 1.6 Nm
  Show Answer
  The correct answer is C .
• Question 952: A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body? Options:
  A) 240N
  B) 32N
  C) 20N
  D) 12N
  E) 8N
  Show Answer
  The correct answer is D .
• Question 953: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 954: Eight alpha decays and six beta decays are necessary before an atom of 2 ${}_{92}^{238}U$ achieves stability. The final product in the chain has an atomic number of Options:
  A) 70
  B) 78
  C) 82
  D) 90
  Show Answer
  The correct answer is C .
• Question 955: A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is Options:
  A) 5.0 x 10⁶
  B) 1.0 x 10⁶
  C) 2.5 x 10⁶
  D) 2.5 x 10⁵
  E) 5.0 x 10⁵
  Show Answer
  The correct answer is E .
• Question 956: A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is? Options:
  A) 850 JK^-1
  B) 750 JK^-1
  C) 650 JK^-1
  D) 500 JK^-1
  Show Answer
  The correct answer is B .
• Question 957: 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 .
• Question 958: If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s²) Options:
  A) 27m/s²
  B) 2m/s²
  C) 4m/s²
  D) 7m/s²
  Show Answer
  The correct answer is A .
• Question 959:

  Which of the following statements regarding the application of electrical conduction via gases is/are correct?
  Electrical conduction in gas is applied in:
  (i) The identification of gases
  (ii) Lighting/fluorescent tubes
  (iii) Photocells
  (iv) Cathode ray oscilloscope/T.V. tubes

  Options:
  A) (i), (iii) and (iv) only
  B) (i), (ii) and (iv) only
  C) (ii), (iii) and (iv) only
  D) (i), (ii) and (iii) only
  Show Answer
  The correct answer is B .
• Question 960:

  A projectile is fired from the ground level with a velocity of 300ms^-1 at an angle of a 30^o to the horizontal.

  Calculate the time taken to reach the maximum height?

  [g = 10ms^-2]

  Options:
  A) 30s
  B) 20s
  C) 25s
  D) 15s
  Show Answer
  The correct answer is D .