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 401: An atom radiates 1.5 × 10^-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0^-34Js ; Speed of light in vacuum = 3.0 × 108ms^-1) Options:
  A) 1.32 × 10^-6m
  B) 2.97 × 10^-6m
  C) 3.30 × 10^-6m
  D) 6.82 × 10^-6m
  E) 8.01 × 10m^-6
  Show Answer
  The correct answer is A .
• Question 402: Which of the following apparatus will require the smallest fuse rating for its protection? Options:
  A) 60W, 240V
  B) 60W, 40V
  C) 40W, 12V
  D) 40W, 5V
  Show Answer
  The correct answer is A .
• Question 403: A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is Options:
  A) 0.5 msec^-1
  B) 1.5 msec^-1
  C) 1 msec^-1
  D) 2 msec^-1
  E) 4 msec^-1
  Show Answer
  The correct answer is C .
• Question 404: The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 10⁸ms^-1, then the frequency of the ultraviolet radiation is Options:
  A) 1.3 x 10¹⁵Hz
  B) 7.5 x 10⁵Hz
  C) 1.2 x 10¹¹Hz
  D) 7.5 x 10¹⁴Hz
  Show Answer
  The correct answer is B .
• Question 405: If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts? Options:
  A) the level of water goes up
  B) the water in the glass outflows
  C) the level of water remains unchanged
  D) the level of water drops
  Show Answer
  The correct answer is D .
• Question 406: What happens when a, certain quantity of pure ice is completely changed to water at 0^oC? Options:
  A) latent heat is absorbed, the mass remains constant, and the volume decreases
  B) latent heat is given out, the mass remains constant and the volume decreases
  C) latent heat is given out, the mass increases and the volume remains constant
  D) latent heat is absorbed, the mass decreases and the volume increases
  Show Answer
  The correct answer is B .
• Question 407: A coin is placed at the bottom of a cube of glass tern thick. If the refractive index of the glass is $\mu$, how high does the coin appear to be raised to an observer looking perpendicularly into the glass? Options:
  A) $\frac{1}{t-\mu }$
  B) $\frac{t(\mu -I)}{\mu }$
  C) t (1 + $\frac{1}{\mu }$)
  D) -$\mu$
  E) $\mu$t
  Show Answer
  The correct answer is B .
• Question 408: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 409: A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be Options:
  A) real, inverted and diminished
  B) virtual, inverted and enlarged
  C) real, erect and enlarged
  D) virtual, erect and enlarged
  Show Answer
  The correct answer is D .
• Question 410: In the calibration of an ammeter using faraday's laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is Options:
  A) 0.03A
  B) 0.04A
  C) 0.05A
  D) 0.06A
  Show Answer
  The correct answer is C .