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 671:

  The height at which the atmosphere cases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

  (ρm = 13.6g/cm${}^3$ ρ = 0.00013g/cm${}^3$ )

  Options:
  A) 380mmHg
  B) 570mmHg
  C) 190mmHg
  D) 480mmHg
  Show Answer
  The correct answer is B .
• Question 672: Which of the following statements about the concept of solid friction is NOT true? Options:
  A) It always acts in the direction of motion
  B) It causes wear and tear in car tyres
  C) It depends on the nature of the surfaces in contact
  D) It is independent of the area of the surfaces in contact.
  E) It reduces the efficiency of the machine
  Show Answer
  The correct answer is A .
• Question 673: Which of the following pairs of musical instruments produce sound due to the vibration of air column? Options:
  A) Bell and piano
  B) Guitar and flute
  C) Trumpet and drum
  D) Trumpet and flute
  E) Violin and organ
  Show Answer
  The correct answer is D .
• Question 674:

  400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 300°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)

  Options:
  A) 10°C
  B) 15°C
  C) 20°C
  D) 30°C
  E) 40°C
  Show Answer
  The correct answer is A .
• Question 675: When a pure semiconductor is heated, its resistance Options:
  A) increases
  B) decreases
  C) remains the same
  D) increases and then decreases
  Show Answer
  The correct answer is B .
• Question 676:

  

  In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P₁ and P₂ dissipated by R₁ and R₂

  Options:
  A) ^R₂/_R1
  B) ^R₁/_R2
  C) ^R₁+R₂/_R1
  D) ^R₁+R₂/_R2
  Show Answer
  The correct answer is A .
• Question 677:

  The force exerted on a charged body in an electric field depends on I. the charge on the body

  II. the electric field intensity

  III. the square of the mass of the body

  Options:
  A) I only
  B) II only
  C) I and II only
  D) I and III only
  E) II and III only
  Show Answer
  The correct answer is C .
• Question 678: When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The ratio of the specific heat capacity of P to Q is Options:
  A) 1 : 4
  B) 4 : 1
  C) 1 : 1
  D) 2 : 1
  Show Answer
  The correct answer is C .
• Question 679: Which of the following pairs of musical instruments produce sound due to the vibration of air column? Options:
  A) Bell and piano
  B) Guitar and flute
  C) Trumpet and drum
  D) Trumpet and flute
  E) Violin and organ
  Show Answer
  The correct answer is D .
• Question 680:

  

  In the figure above, XY is of length 1m, The value of R at balance point Z is

  Options:
  A) 3.0Ω
  B) 13.3Ω
  C) 15.0Ω
  D) 30.0Ω
  Show Answer
  The correct answer is D .