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 351: 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 352: Shadows and eclipse result from the Options:
  A) Reflection of light
  B) Rectilinear propagation of light
  C) Diffraction of light
  D) Refraction of light
  Show Answer
  The correct answer is B .
• Question 353: Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of Options:
  A) $\alpha$, X, and $\beta$
  B) $\alpha$, $\beta$ and $\gamma$-rays
  C) X, $\alpha$, $\gamma$-ray
  D) $\alpha$, $\beta$ and X-rays
  Show Answer
  The correct answer is B .
• Question 354: In A.C circuit theory, the root means square (r.m.s) current, I_rms and the peak (maximum)current I_o are related by Options:
  A) I_o = $\frac{I_{r}ms}{\sqrt{2}}$
  B) I_rms = $\frac{I_o}{\sqrt{2}}$
  C) I_rms = $\frac{\frac{I}{I_o}}{\sqrt{2}}$
  D) I_rms = $\frac{I_{r}ms}{\sqrt{2}}$
  Show Answer
  The correct answer is B .
• Question 355: What happens to a water pool on a day when the humidity of the air is very low? Options:
  A) Temperature decreases
  B) Slow evaporation
  C) Temperature increases
  D) Rapid evaporation
  Show Answer
  The correct answer is D .
• Question 356:

  A piece of substance of specific heatcapacity 450Jkg${}^{-1}$k${}^1$ falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms${}^{-2}$]

  Options:
  A) $\frac{2}{9}$ºC
  B) $\frac{4}{9}$ºC
  C) $\frac{9}{2}$ºC
  D) $\frac{9}{4}$ºC
  Show Answer
  The correct answer is B .
• Question 357: Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative Options:
  A) i only
  B) i and ii only
  C) ii and iii only
  D) i, ii, iii and iv only
  E) all five
  Show Answer
  The correct answer is E .
• Question 358: The velocity of a sound wave at 27^oC is 360ms^-1. Its velocity at 127^oC is Options:
  A) 120√3 ms^-1
  B) 240 ms^-1
  C) 240√3 ms^-1
  D) 720√3 ms^-1
  Show Answer
  The correct answer is C .
• Question 359: Which of the following statements are true in the structure of atoms? Options:
  A) the atoms of the differnt element differ only in the number of protons and electrons
  B) the num,ber of protons equals the number of electrons
  C) atoms are constructed according to the plan of our solar system
  D) all of the above
  E) A and C only
  Show Answer
  The correct answer is B .
• Question 360:

  

  In the figure above W1 = 200g, and W2 =450g . Calculate the extension of the spring per unit load? [g = 10ms^-2]

  Options:
  A) 6.0 x 10^-5mN^-1
  B) 2.5 x 10^-4mN^-1
  C) 6.0 x 10 ^-3mN^-1
  D) 2.5 x 10 ^-2mN^-1
  Show Answer
  The correct answer is C .