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 91:

  If in a simple pendulum experiment the length of the inextensible string is increased by a factor offour, its period is increased by a factor of?

  Options:
  A) 4
  B) $\frac{\pi }{2}$
  C) $\frac{1}{4}$
  D) 2
  Show Answer
  The correct answer is D .
• Question 92: A cube of side 10cm and mass 0.5kg floats in a liquid with only $\frac{1}{5}$ of its height above the liquid surface. What is the relative density of the liquid? Options:
  A) 0.125cm^-1
  B) 0.250gcm^-1
  C) 0.625cm^-1
  D) 2.500cm^-1
  Show Answer
  The correct answer is C .
• Question 93: An example of a scalar quantity is Options:
  A) velocity
  B) weight
  C) electric charge
  D) acceleration due to gravity
  E) momentum
  Show Answer
  The correct answer is C .
• Question 94: 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 95: A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is? Options:
  A) (15)/16
  B) (1)/16
  C) (3)/4
  D) (1)/4
  Show Answer
  The correct answer is A .
• Question 96:

  Which expression gives magnetic flux?

  Options:
  A) qVB sin$\theta$
  B) $\frac{\mu \varphi I}{2\pi r}$
  C) BA cos $\theta$
  D) -N $\frac{d\varphi }{dt}$
  Show Answer
  The correct answer is C .
• Question 97:

  A 500W heater is used to heat 0.6kg of water from 25^oC to 100^oC in t₂ seconds. If another 1000W heater is used to heat 0.2kg of water from 10^oC to 100^oC in t, seconds, find $\frac{t_1}{t_2}$

  Options:
  A) 50
  B) 5
  C) 5/4
  D) 1/5
  Show Answer
  The correct answer is D .
• Question 98: 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 99: Light of velocity 3 x 10⁸ms^-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 10⁸ms^-1 in the material, what is n? Options:
  A) 2.33
  B) 2.25
  C) 1.33
  D) 1.25
  Show Answer
  The correct answer is D .
• Question 100: Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30^o with the resultant, determine its magnitude. Options:
  A) 8.66N
  B) 50.0N
  C) 57.7N
  D) 86.6N
  Show Answer
  The correct answer is D .