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 461: A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is Options:
  A) y = 0.15 sin 200π(x - 5.5t)
  B) y = 0.15 sin π(0.01x - 5.5t)
  C) y = 0.15 sin 5.5π(x - 200t)
  D) y = 0.15 sin π(550x - 0.01t)
  Show Answer
  The correct answer is A .
• Question 462: Dispersion occurs when white light passes through a glass prism because of the Options:
  A) different hidden colours in the glass
  B) different speeds of the colour in the glass
  C) defects in the glass
  D) high density of the glass
  Show Answer
  The correct answer is B .
• Question 463:

  A 35 kΩ is connected in series with a resistance of 40 kΩ. What resistance R must be connected in parallel with the combination so that the equivalent resistance is equal to 25 kΩ?

  Options:
  A) 40 kΩ
  B) 37.5 kΩ
  C) 45.5 kΩ
  D) 30 kΩ
  Show Answer
  The correct answer is B .
• Question 464: The length of a side of a metallic cube at 20^oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10^-5k^-1, find the volume of the cube at 120^oC . Options:
  A) 126.50cm³
  B) 126.25cm³
  C) 126.00cm³
  D) 125.00cm³
  Show Answer
  The correct answer is A .
• Question 465: Power supply is transmitted at a very high voltage and low current in order to Options:
  A) make pass through the trasformers
  B) increase the power supply
  C) make it travel fast
  D) prevent overheating of the coil
  Show Answer
  The correct answer is D .
• Question 466:

  

  In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?

  Options:
  A) red, green and blue
  B) Green, red and blue
  C) Yellow , blue and red
  D) Blue , yellow and red
  Show Answer
  The correct answer is A .
• Question 467:
  

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

  Options:
  A) increase the current by 0.4A
  B) reduce the current by 0.4A
  C) increase the current by 0.6A
  D) reduce the current by 0.6A
  Show Answer
  The correct answer is A .
• Question 468: A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is Options:
  A) 4%
  B) 5%
  C) 40%
  D) 50%
  E) 80%
  Show Answer
  The correct answer is E .
• Question 469: The speed of light in air is 3 x 10⁸ms^-1. What is the speed in glass with a refractive index of 1.50? Options:
  A) 1.5 x 10⁸ms^-1
  B) 3.0 x 10⁸ms^-1
  C) 2.0 x 10⁸ms^-1
  D) 6.0 x 10⁸ms^-1
  Show Answer
  The correct answer is C .
• Question 470: An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1] Options:
  A) 420S
  B) 336S
  C) 168S
  D) 48S
  Show Answer
  The correct answer is B .