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 1081: Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station? Options:
  A) Electrical $\to$ mechanical $\to$ potential
  B) potential $\to$mechanical $\to$electrical $\to$ light
  C) mechanical $\to$ sound $\to$ electrical $\to$ light
  D) kinetic $\to$ mechanical $\to$ electrical $\to$light
  Show Answer
  The correct answer is B .
• Question 1082: The threshold of frequency for photoelectric effect depends on the Options:
  A) intensity of incident light
  B) frquency of incident light
  C) material of the photocathode
  D) potential difference between the cathode and the anode
  Show Answer
  The correct answer is C .
• Question 1083:

  A cell of internal resistance 2 π supplies current to a 6 π resistor. The efficiency of the cell is

  Options:
  A) 12.0%
  B) 25.0%
  C) 33.3%
  D) 75.0%
  Show Answer
  The correct answer is C .
• Question 1084: A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is Options:
  A) 4.0 x 10²N
  B) 2.0 x 10³N
  C) 4.0 x 10³N
  D) 4.0 x 10⁴N
  Show Answer
  The correct answer is B .
• Question 1085: A load of 20N on a wire of cross-sectional area 8 x 10^-7m², produces an extension of 10m². calculate Young's modulus for the material of the wire if its length is 3m Options:
  A) 7.0 x 10¹¹Nm^-2
  B) 7.5 x 10¹¹Nm^-2
  C) 8.5 x 10¹¹Nm^-2
  D) 9.0 x 10¹¹Nm^-2
  Show Answer
  The correct answer is B .
• Question 1086:

  A car moving with a speed of 90kmh^-1 was brought uniformly to rest by the application of the brakes in 10s. How far did the car travel after the brakes were applied?

  Options:
  A) 125m
  B) 150m
  C) 250m
  D) 15km
  Show Answer
  The correct answer is A .
• Question 1087:

  What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

  Options:
  A) 80N
  B) 90N
  C) 100N
  D) 120N
  Show Answer
  The correct answer is C .
• Question 1088:

  The process whereby a liquid turns spontaneously into vapour is called

  Options:
  A) regelation
  B) evaporation
  C) boiling
  D) sublimation
  Show Answer
  The correct answer is B .
• Question 1089: Any line or section through an advancing wave in which all the particles are in the same phase is called the Options:
  A) wave lenght
  B) wave crest
  C) wave trough
  D) wave amplitude
  E) wave front
  Show Answer
  The correct answer is E .
• Question 1090: A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is Options:
  A) 0.14s
  B) 0.43s
  C) 2.32s
  D) 6.97s
  Show Answer
  The correct answer is C .