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 921: If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT? Options:
  A) 4:01
  B) 1:04
  C) 5:01
  D) 2:01
  Show Answer
  The correct answer is A .
• Question 922: The energy in the nucleus of atoms produce heat which can be used to generate Options:
  A) Kinetic energy
  B) Mechanical energy
  C) Electrical energy
  D) Potential energy
  Show Answer
  The correct answer is A .
• Question 923: A series RLC circuit is said to resonate, when Options:
  A) capacitive reactance is zero
  B) conductance is maximum
  C) current is minimum
  D) impedance is minimum
  E) inductive reactance is zero
  Show Answer
  The correct answer is D .
• Question 924: The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms^-1, the depth of the ocean is Options:
  A) 1,750m
  B) 3,500m
  C) 1,400m
  D) 2,800m
  E) 2,100m
  Show Answer
  The correct answer is A .
• Question 925:
  

  In an experiment in which molten naphthaleneis allowed to cool, the cooling curve i n the figure was obtained. The temperature 80${}^o$C is known as the

  Options:
  A) cooling temperature
  B) boiling point
  C) melting point
  D) vaporization point
  Show Answer
  The correct answer is C .
• Question 926: If the temperature of a resistance wire is gradually increased, its resistance will Options:
  A) decrease gradually
  B) first increase and then decrease
  C) first increase and then remain the same
  D) increase gradually
  E) remain the same
  Show Answer
  The correct answer is C .
• Question 927: Which of the following phenomena CANNOT be explained by the molecular theory of matter? Options:
  A) Expansion
  B) Conduction
  C) Convection
  D) Radiation
  E) Evaporation
  Show Answer
  The correct answer is D .
• Question 928: 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 929: A gas at a volume of V₀ in a container at pressure P₀ is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant? Options:
  A) P₀/5
  B) 4P₀/5
  C) P₀
  D) 5P₀
  Show Answer
  The correct answer is D .
• Question 930: A sheet of white paper viewed through blue glass appears blue because Options:
  A) blue is a primary colour
  B) the glass absorbs all colours except the blue colour
  C) the glass reflects blue colour
  D) the paper reflects blue colour only
  E) white light is easily absorbed by the glass
  Show Answer
  The correct answer is B .