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 431: The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant? Options:
  A) 0.3
  B) 6.0
  C) 3.0
  D) 2.0
  Show Answer
  The correct answer is C .
• Question 432: If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object? Options:
  A) 90 m
  B) 30 m
  C) 45 m
  D) 60 m
  Show Answer
  The correct answer is C .
• Question 433: If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object Options:
  A) Is quadrupled
  B) Is halved
  C) Remains the same
  D) Is double
  Show Answer
  The correct answer is D .
• Question 434: If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then Options:
  A) H $\alpha$ $\frac{1}{I}$
  B) H $\alpha$ $\frac{1}{I^2}$
  C) H $\alpha$ $\sqrt{1}$
  D) H $\alpha$ I²
  E) none of the above
  Show Answer
  The correct answer is D .
• Question 435: A rocket burns fuel at the rate of 10kgs^-1 and ejects it with velocity of 5 x 10³ms^-1. The thrust exerted by the gas on the rock is Options:
  A) 2.5 x 10⁷N
  B) 5.0 x 10⁴N
  C) 5.0 x 10²N
  D) 2.0 x 10^-3N
  Show Answer
  The correct answer is B .
• Question 436: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1] Options:
  A) 840J
  B) 3360J
  C) 3420J
  D) 4200J
  E) 7560J
  Show Answer
  The correct answer is E .
• Question 437: A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio. Options:
  A) 0.53
  B) 0.83
  C) 1.20
  D) 1.50
  E) 1.88
  Show Answer
  The correct answer is E .
• Question 438: A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally? Options:
  A) 30cm
  B) 10cm
  C) 20cm
  D) 25m
  Show Answer
  The correct answer is C .
• Question 439: Calculate the specific latent heat of vaporization of steam of 1.13 x 106J pf heat energy is required to convert 15kg of it to water. Options:
  A) 7.53 x 105 Jkg${}^{-1}$
  B) 7.53 x 10-2Jkg${}^{-1}$
  C) 7.53 x 104Jkg${}^{-1}$
  D) 7.53 x 10-3Jkg${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 440: If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is Options:
  A) 2.2.5 x 10 ⁵js^-1
  B) 2.5 x 10⁴js^-1
  C) 3.3 x 10³js^-1
  D) 3.3 x 10²js^-1
  Show Answer
  The correct answer is C .