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 2201: A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value Options:
  A) 100Ω
  B) 200Ω
  C) 300Ω
  D) 500Ω
  Show Answer
  The correct answer is B .
• Question 2202:

  I. A liquid boils when its saturated vapor pressure is equal to the external pressure
  II. Dissolved substances in pure water lead to an increase in the boiling point.
  III. When the external pressure is increased, the boiling point increases.
  IV. Dissolved substances in pure water decreases the boiling point

  Which of the above combinations are peculiarities of the boiling point of a liquid?

  Options:
  A) I, II and III only
  B) I, II, III, and IV
  C) I, II, and IV
  D) II, III, and IV
  Show Answer
  The correct answer is A .
• Question 2203: A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine Options:
  A) 80.0%
  B) 76.6%
  C) 66.7%
  D) 60.7%
  Show Answer
  The correct answer is C .
• Question 2204: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .
• Question 2205: Which of the following statements are correct about an object in equilibrium under parallel forces? i. the total clockwise moments of the forces about any point equals the total anti-clockwise moments about the same point. ii. the total forces in one direction equals the total forces in the opposite direction. iii. the resolved components along the x-axis equals the resolved components along the y-axis. Options:
  A) i and ii only
  B) i and iii only
  C) ii and iii
  D) i, ii, and iii only
  Show Answer
  The correct answer is A .
• Question 2206: an electric cell with nominal voltage E has a resistance of 3Ω connected across it. If the voltage falls to 0.6E, the internal resistance of the cell is Options:
  A) 1Ω
  B) 2Ω
  C) 3Ω
  D) 4Ω
  Show Answer
  The correct answer is C .
• Question 2207: Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane? Options:
  A) Random and rotational
  B) Rotational and oscillatory
  C) Rotational only
  D) Translations only
  E) Translational and rotational
  Show Answer
  The correct answer is E .
• Question 2208:

  A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.

  The value of R is

  Options:
  A) 3 Ω
  B) 2 Ω
  C) 1 Ω
  D) 6 Ω
  Show Answer
  The correct answer is A .
• Question 2209: Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is Options:
  A) conical
  B) cubical
  C) cylindrical
  D) parabolic
  E) spherical
  Show Answer
  The correct answer is C .
• Question 2210:

  

  A Uniform beam PQ of mass 20kg and length 5m is balanced as shown above, a man of weight 800N stands at M such that QM = 2m. The reaction at P and Q respectively are(take g = 10ms^-2)

  Options:
  A) 300N and 500N
  B) 420N and 580N
  C) 220N and 380N
  D) 580N and 420N
  E) 382N and 220N
  Show Answer
  The correct answer is B .