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 841:
  

  Consider the three forces acting at O and in equilibrium as shown in the figure. Which of the following equations is/are CORRECT?

  I.P${}_1$ cos${\theta }_1$ = p${}_1$ cos ${\theta }_2$

  II. P${}_3$ = P${}_1$ cos ${\theta }_4$ + P${}_{2}co{s}_2$

  III. P${}_1\sin {\theta }_1=P_2\sin {\theta }_2$

  Options:
  A) I only
  B) II only
  C) III only
  D) I, II and III only
  Show Answer
  The correct answer is C .
• Question 842: In copper plating, a current of 0.5A is allowed for cathode area of 100cm². If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/^oC, density of copper = 10^-4g/cm³ ) Options:
  A) 10^-2mm
  B) 10^-3mm
  C) 10^-4mm
  D) 10^-5mm
  E) 10^-6mm
  Show Answer
  The correct answer is E .
• Question 843: Which of the following pairs of musical instruments produce sound due to the vibration of air column? Options:
  A) Bell and piano
  B) Guitar and flute
  C) Trumpet and drum
  D) Trumpet and flute
  E) Violin and organ
  Show Answer
  The correct answer is D .
• Question 844: Which of the following statements is CORRECT? i. the mass number is equal to the total number of protons and electrons in an atom. ii. the atomic number is equal to the number of protons in an atom. iii. the number of electrons in an atom is equal to the total number of protons and neutrons in the nucleus. Options:
  A) i only
  B) ii only
  C) iii only
  D) i and ii only
  E) ii and iii only
  Show Answer
  The correct answer is B .
• Question 845:

  

  The net capacitance of the circuit shown above is

  Options:
  A) 8.0µF
  B) 6.0µF
  C) 4.0µF
  D) 2.0µF
  Show Answer
  The correct answer is D .
• Question 846: Which of the following properties makes metals ideal for cooking utensils? Options:
  A) high coefficient of expansion
  B) good conduction of heat
  C) low specific heat capacity
  D) poor radiation of heat
  Show Answer
  The correct answer is B .
• Question 847: Efficiency of a transformer is equal to Options:
  A) Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
  B) Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
  C) Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
  D) Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
  Show Answer
  The correct answer is D .
• Question 848: A dynamo primarily converts Options:
  A) Mechanical energy into electrical energy
  B) Electrical energy into kinetic energy
  C) Potential energy into kinetic energy
  D) Kinetic energy into potential energy
  Show Answer
  The correct answer is A .
• Question 849:

  In an elastic collisionI. Energy is conserved

  II. Energy is decreased

  III. Energy is increased

  IV. Linear momentum conversed

  Options:
  A) I only
  B) II and IV only
  C) II only
  D) III only
  Show Answer
  The correct answer is B .
• Question 850: Which of the following is a vector? Options:
  A) Electric charge
  B) Electric field
  C) Electrical potential difference
  D) Electrical capacitance
  Show Answer
  The correct answer is B .