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 1011: A calorimeter of thermal capacity 80J contains 20g of water at 25^oC. Water at 100^oC is added so that the final temperature of the set-ups is 50^oC. The amount of water added is (Heat capacity of water = 4.18J/g/^oC) Options:
  A) 20g
  B) 25g
  C) 45g
  D) 50g
  E) 100g
  Show Answer
  The correct answer is A .
• Question 1012: 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 1013: The refractive index of liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10⁸ms^-1, the velocity of light in the liquid is Options:
  A) 1.5 x 10⁸m^-1
  B) 2.0 x 10⁸m^-1
  C) 3.0 x 10⁸m^-1
  D) 4.5 x 10⁸m^-1
  E) 9.0 x 10⁸m^-1
  Show Answer
  The correct answer is B .
• Question 1014:

  A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

  Options:
  A) 3 rev s^-1
  B) 40 rev s^-1
  C) 360 rev s^-1
  D) 2400 rev s^-1
  Show Answer
  The correct answer is B .
• Question 1015: When a transformer has more secondary windings than primary windings, it Options:
  A) has a smaller secondary current
  B) has a greater power output
  C) is a step-down transformer
  D) increases the total energy output
  Show Answer
  The correct answer is C .
• Question 1016: The main function of the commutator in a simple d.c. motor is to Options:
  A) enable the armature to rotate freely
  B) increase the flux linking the armature windings
  C) maintain a direct current in the armature
  D) provide uniform magnetic field around the armature
  E) reverse the direction of the current in the armature.
  Show Answer
  The correct answer is E .
• Question 1017: A man stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weight Options:
  A) greater than the weight of the man
  B) the same as the weight of the man
  C) of zero
  D) less than the weight of the man
  E) greater than the weight of the man by 1kg
  Show Answer
  The correct answer is B .
• Question 1018:

  The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

  Options:
  A) 400
  B) 300
  C) 200
  D) 150
  Show Answer
  The correct answer is C .
• Question 1019: A transistor function mainly as a Options:
  A) switch and amplifier
  B) rectifier and an amplifier
  C) charge storer and an amplifier
  D) charge storer and a switch
  Show Answer
  The correct answer is A .
• Question 1020: An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is? Options:
  A) 20 cm
  B) 15 cm
  C) 10 cm
  D) 5 cm
  Show Answer
  The correct answer is D .