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 781: THe velocity of sound in air at 16^oC is 340ms^-1. What will it be when the pressure is doubled and its temperature raised to 127^oC? Options:
  A) 400 ms^-1
  B) 4,000 ms^-1
  C) 8,000 ms^-1
  D) 160,000 ms^-1
  Show Answer
  The correct answer is A .
• Question 782: Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is Options:
  A) conical
  B) cubical
  C) cylindrical
  D) parabolic
  E) spherical
  Show Answer
  The correct answer is C .
• Question 783: Two resistors R₁ and R₂ are connected in parallel, R₂ being greater than R₁. The combined resistance is Options:
  A) less than R₁
  B) greater than R₂
  C) the sum of R₁ and R₂
  D) the difference of R₂ and R₁
  E) greater thanR₁ but less than R₂
  Show Answer
  The correct answer is C .
• Question 784: 491 K is equivalent to Options:
  A) 273 °C
  B) 218 °C
  C) 373 °C
  D) 491 °C
  E) 764 °C
  Show Answer
  The correct answer is B .
• Question 785:

  A concave mirror of radius of curvature 40 cm forms a real image twice as large as the object.

  The object distance is

  Options:
  A) 10 cm
  B) 30 cm
  C) 40 cm
  D) 60 cm
  Show Answer
  The correct answer is B .
• Question 786:

  

  The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

  Options:
  A) 14.0 N
  B) 10.0 N
  C) 12.0 N
  D) 13.0 N
  Show Answer
  The correct answer is B .
• Question 787: 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 788: A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? Options:
  A) 528m
  B) 66m
  C) 136m
  D) 264m
  Show Answer
  The correct answer is C .
• Question 789: For which of the following sets are the units fundamental? Options:
  A) Area, length and volume
  B) Impulse, mass and time
  C) Length, time and mass
  D) Velocity, distance and time
  E) Volume, mass and density
  Show Answer
  The correct answer is C .
• Question 790: When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is Options:
  A) 1200W
  B) 600W
  C) 120W
  D) 30W
  Show Answer
  The correct answer is A .