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 371:

  A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

  Options:
  A) 4.0 x 10²W
  B) 5.0 x 10²W
  C) 4.0 x 10³W
  D) 5.0 x 10³W
  Show Answer
  The correct answer is D .
• Question 372: 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 373:

  

  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 374: If a metal wire 4m long and cross-sectional area 0.8 mm² has a resistance of 60, find the resistivity of the wire Options:
  A) 5.3x10^-7
  B) 3.0x10^-5
  C) 1.2x10^-6
  D) 3.2x10^-6
  Show Answer
  The correct answer is C .
• Question 375: A wire of length 100cm and cross-sectional area 2.0 × 10^-3cm² has a resistance of 0.10 ω. Calculate its electrical conductively. Options:
  A) 2.0 × 10-6 ω^-1cm^-1
  B) 5.0 × 10-5 ω^-1cm^-1
  C) 2.0 × 106 ω^-1cm^-1
  D) 5.0 × 106 ω^-1cm^-1
  E) 5.0 × 107 ω^-1cm^-1
  Show Answer
  The correct answer is B .
• Question 376:

  In an AC circuit, resonance occurs when the impedance of the circuit is:

  Options:
  A) Zero
  B) Maximum
  C) Equal to the capacitive reactance of the circuit
  D) Minimum
  Show Answer
  The correct answer is D .
• Question 377:

  

  The figure above shows a uniform wood of weight 200N and length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. Calculate the tension in the cord if the wood is horizontal.

  Options:
  A) 10N
  B) 20N
  C) 100N
  D) 200N
  Show Answer
  The correct answer is D .
• Question 378: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 379: A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object? Options:
  A) 2.0cm
  B) 3.3cm
  C) 5.0cm
  D) 10.0cm
  E) 15.0cm
  Show Answer
  The correct answer is E .
• Question 380:

  Arrange the following in the order of their increasing frequency.I. Visible light

  II. Gamma rays

  III. Radio waves

  IV. Infra-red radiation

  V. Ultra-violet radiation

  Options:
  A) I, II, III, IV, V
  B) II, III, IV, V, I
  C) III, IV, V, I, II
  D) IV, III, I. V, II
  E) III, IV, I,V, II
  Show Answer
  The correct answer is E .