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 41:

  A pool of water appears to be 1.00m deep when viewed vertically from above. What is the actual depth of the pool?

  [Refractive index of water = 1.33]

  Options:
  A) 13.300m
  B) 0.750m
  C) 1.013m
  D) 1.330m
  Show Answer
  The correct answer is D .
• Question 42: 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 43: At what respective value of a, b, and c would the unit of work, the joule, be dimensionally similar to M^a L^b T^c? Options:
  A) 1, – 2, 1
  B) 1, 2, – 2
  C) 1, 1, –2
  D) 2, 2, 1
  Show Answer
  The correct answer is B .
• Question 44: The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for Options:
  A) improving the sharpness
  B) creating an inverted image
  C) magnification of the image
  D) erection of the image
  Show Answer
  The correct answer is D .
• Question 45: The current in a reverse-biased junction is due to? Options:
  A) minority carriers
  B) electrons
  C) majority carriers
  D) holes
  Show Answer
  The correct answer is A .
• Question 46: The fundamental frequency of vibration of a sonometer wire may be halved by Options:
  A) doubling the length of the wire
  B) doubling the mass of the wire
  C) reducing the tension by half
  D) reducing the absolute temperature by half
  Show Answer
  The correct answer is A .
• Question 47: A thin aluminum plate has a surface area of 1500m at 20^oC. What will be its surface area when it is cooled to -20^oC? (Take the linear expansivity of aluminum to be 2.5 x 10^-5k^-1). Options:
  A) 1.503m²
  B) 1.500m²
  C) 1.498m²
  D) 1.497m²
  E) 1.490m²
  Show Answer
  The correct answer is C .
• Question 48: Which of the following will convert a milliammeter to a voltmeter? Options:
  A) low series resistance
  B) low parallel resistance
  C) high series resistance
  D) high parallel resistance
  E) parallel resistance equal to milliammeter resistance
  Show Answer
  The correct answer is C .
• Question 49: Three resistors, with substances 250$\mathrm{\Omega }$, 500$\mathrm{\Omega }$ and 1k$\mathrm{\Omega }$ are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250$\mathrm{\Omega }$ resistor. Options:
  A) 0.20V
  B) 0.86V
  C) 1.71V
  D) 3.43V
  Show Answer
  The correct answer is B .
• Question 50: Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced. Options:
  A) 1 : 4
  B) 2 : 1
  C) 2 : 3
  D) 2 : 5
  Show Answer
  The correct answer is C .