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 21: The ratio of electrostatic force F_E to gravitational force F_G between two protons each of charge e and mass m, at a distance d is Options:
  A) e/4πԐoGm
  B) e²/Gm²
  C) Gm²/4πԐoe²
  D) e²/4πԐoeGm²
  Show Answer
  The correct answer is D .
• Question 22: A lamp is rated 240V, 60W. The resistance of the filament is Options:
  A) 960$\mathrm{\Omega }$
  B) 16$\mathrm{\Omega }$
  C) 15$\mathrm{\Omega }$
  D) 4$\mathrm{\Omega }$
  Show Answer
  The correct answer is A .
• Question 23:

  A progressive wave equation is represented by y = a sin(150 πt - πx/4). if the phase difference of a progressive wave is 45°, the value of x in the equation is

  Options:
  A) 3 cm
  B) 4 cm
  C) 1 cm
  D) 2 cm
  Show Answer
  The correct answer is C .
• Question 24: A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is Options:
  A) 9.6J
  B) 2.4J
  C) 12.0J
  D) 7.2J
  Show Answer
  The correct answer is B .
• Question 25:

  Natural radioactivity consists of emission?

  Options:
  A) $\alpha$-particles and $\beta$-rays
  B) $\alpha$-particles and X-rays
  C) $\gamma$-ray and X-rays
  D) $\alpha$-particles and $\beta$-rays and $\gamma$-rays
  Show Answer
  The correct answer is D .
• Question 26: A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is Options:
  A) 0.14s
  B) 0.43s
  C) 2.32s
  D) 6.97s
  Show Answer
  The correct answer is C .
• Question 27: The d.c generator has essentially the same components as the a.c generator except the presence of? Options:
  A) slip-ring
  B) carbon brushes
  C) split ring
  D) armature
  Show Answer
  The correct answer is C .
• Question 28:

  A binary operation $\otimes$ defined on the set of integers is such that m $\otimes$ n = m + n + mn for all integers m and n. Find the inverse of -5 under this operation, if the identity element is 0

  Options:
  A) $\frac{-5}{4}$
  B) $\frac{-5}{6}$
  C) o
  D) 5
  Show Answer
  The correct answer is A .
• Question 29: The latent heat of fusion of ice is 80cal g^-1. How much heat is required to change 10g of ice at Q^oC into water at the same temperature? Options:
  A) 80 cal
  B) 10 cal
  C) 8 cal
  D) 800 cal
  E) 400 cal
  Show Answer
  The correct answer is D .
• Question 30: A thermometer with an arbitrary scale S, of equal division registers -30^oS at the ice point and +90^oS at the steam point. Calculate the Celsius temperature corresponding to 60^oS Options:
  A) 25.0^oC
  B) 50.0^oC
  C) 66.7^oC
  D) 75.0^oC
  Show Answer
  The correct answer is D .