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 81: Which of the following with respect to a body performing simple harmonic motion are in phase? Options:
  A) displacement and velocity of the body
  B) displacement and force on the body
  C) velocity and acceleration of the body
  D) force acting on the body and the acceleration
  Show Answer
  The correct answer is C .
• Question 82:

  Which of the following is not correct about the molecules of a substance in a gaseous state. They?

  Options:
  A) are in a constant state of motion
  B) have different speeds
  C) have a temperature which is measured by the average kinetic energy
  D) The collision between the gases is perfectly inelastic
  Show Answer
  The correct answer is D .
• Question 83: Which of the following statements is CORRECT? Options:
  A) charges generated on glass rubbed with silk are called negative
  B) charges in various media can be carried by protons detached from their atom
  C) the magnitude of any charge is a multiple of the charge of an electron
  D) the intensity of an electric field is a scalar quantity
  E) if 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V
  Show Answer
  The correct answer is C .
• Question 84:

  The motion of a body is simple harmonic if the?

  Options:
  A) acceleration is always directed towards a fixed point
  B) path of motion is a straight line
  C) acceleration is proportional to the square of the distance from a fixed point
  D) acceleration is constant and directed towards a fixed point
  Show Answer
  The correct answer is A .
• Question 85:

  

  The effect of closing the key K in the circuit shown above would be to

  Options:
  A) increase the current by 0.6A
  B) reduce the current by 0.6A
  C) increase the current by 0.4A
  D) keep the current unchanged
  Show Answer
  The correct answer is C .
• Question 86: Two liquids, P at a temperature of 20^oC and Q at a temperature of 80^oC have specific heat capacities of 1.0Jkg^-1oC^-1 and 1.5J kg^-1oC^-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is Options:
  A) 44^oC
  B) 50^oC
  C) 56^oC
  D) 60^oC
  E) 70^oC
  Show Answer
  The correct answer is C .
• Question 87:

  

  If current flows in the direction of the arrows in the solenoid above, the north pole is at

  Options:
  A) P
  B) Y
  C) X
  D) Q
  Show Answer
  The correct answer is D .
• Question 88:

  

  In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is

  Options:
  A) m1/m2
  B) m1g/m2
  C) m2/m1
  D) m2g/m1
  Show Answer
  The correct answer is C .
• Question 89: What happens when a gas expands at constant temperature? Options:
  A) its pressure decreases
  B) the total momentum of its molecules remains constant
  C) its pressure decreases and the total momentum of its moleculees remains constant
  D) its pressure decreses and the total kinetic energy of its molecule decreases
  Show Answer
  The correct answer is A .
• Question 90:

  

  The fig above represents the main sequence of energy conversion at Kainji dam. What is the efficiency of the system?

  Options:
  A) Q1/Q2
  B) E/Q1
  C) E/(Q1-Q2)
  D) E/(Q1-Q2)
  Show Answer
  The correct answer is B .