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 2741: A room is heated by means of a charcoal fire, An occupant of the room standing away from the fire is warmed mainly by Options:
  A) convection
  B) radiation
  C) conduction
  D) reflection
  Show Answer
  The correct answer is B .
• Question 2742: An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell? Options:
  A) 5 volts
  B) 3.5 volts
  C) 2.5 volts
  D) 1 volts
  E) 10 volts
  Show Answer
  The correct answer is B .
• Question 2743: Which of the following instruments has a pure tone? Options:
  A) guitar
  B) vibrating strings
  C) tuning fork
  D) siren
  Show Answer
  The correct answer is C .
• Question 2744: When some ice cubes are added to a glass of warm water, the glass is cooled by a process of Options:
  A) conduction only
  B) convection only
  C) conduction and convection
  D) conduction and radiation
  E) radiation only
  Show Answer
  The correct answer is C .
• Question 2745: Which of the following is a property of steel? Options:
  A) it cannot retain its magnetism longer than iron
  B) it can be used for making temporary magnets
  C) it can be used for making permanent magnets
  D) it can easily be magnetized and demagnetized
  Show Answer
  The correct answer is C .
• Question 2746:

  The velocities of light in air and glass are 3.0 x 10${}^8$ms${}^{-1}$ and 2.0 x 10${}^8$ms${}^{-1}$ respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

  Options:
  A) 0.33
  B) 0.50
  C) 0.67
  D) 0.75
  Show Answer
  The correct answer is D .
• Question 2747: In the diagram above, X and Y have resistances 6 and 4 ohms respectively, if the power dissipation in X is 10W then power dissipation in Y is Options:
  A) 2.4W
  B) 4
  C) 6.0W
  D) 6.7W
  E) 15.0W
  Show Answer
  The correct answer is D .
• Question 2748: What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage? Options:
  A) e = M.A/V.R × 100 %
  B) M.A = E.V.R
  C) V.R = 1 ÷ sin θ M.A
  D) M.A = 1/E × 100%
  Show Answer
  The correct answer is A .
• Question 2749: A transformer has a primary coil with 500 turns and a secondary coil with 2500 turns. When the voltage input to the primary coil is 120V, the output is Options:
  A) 6000V
  B) 600V
  C) 240V
  D) 60V
  E) 24V
  Show Answer
  The correct answer is B .
• Question 2750: The expansion of solids can be considered a disadvantage in the Options:
  A) balance wheel of a watch
  B) fitting of wheels on rims
  C) fire alarm
  D) thermostat
  Show Answer
  The correct answer is B .