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 2381: The length of a side of a metallic cube at 20^oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10^-5k^-1, find the volume of the cube at 120^oC . Options:
  A) 126.50cm³
  B) 126.25cm³
  C) 126.00cm³
  D) 125.00cm³
  Show Answer
  The correct answer is A .
• Question 2382:

  In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

  Options:
  A) 30V
  B) 70V
  C) 50V
  D) 40V
  Show Answer
  The correct answer is D .
• Question 2383: Electricity is supplied to a school along a cable of total resistance 0.5$\mathrm{\Omega }$ with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is Options:
  A) 3.6 x 10³J
  B) 5.0 x 10³J
  C) 3.0 x 10⁵J
  D) 1.8 x 10⁷J
  Show Answer
  The correct answer is D .
• Question 2384: A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum Options:
  A) 4.0 m
  B) 3.0 m
  C) 2.0 m
  D) 1.5 m
  Show Answer
  The correct answer is C .
• Question 2385: For a short sighted person, light rays from a point on a very distant object is focused Options:
  A) in front of the retina
  B) on the retina by a converging lens
  C) behind the retina by a diverging lens
  D) in front of the retina, a distance 2F from the lens
  Show Answer
  The correct answer is A .
• Question 2386:

  A metal rod has a length of 100cm at 200${}^{o}C$. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 $\times$ 10${}^{-5}{C}^{-1}$

  Options:
  A) 200${}^o$C
  B) 300${}^o$C
  C) 100${}^o$C
  D) -100${}^o$C
  Show Answer
  The correct answer is D .
• Question 2387: 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 2388:

  A train has an initial velocity of 44m/s and an acceleration of -4m/s${}^2$. Calculate its velocity after 10 seconds

  Options:
  A) 10m/s
  B) 6m/s
  C) 8m/s
  D) 4m/s
  Show Answer
  The correct answer is D .
• Question 2389: A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2] Options:
  A) 1000 N
  B) 700 N
  C) 110 N
  D) 10 N
  Show Answer
  The correct answer is D .
• Question 2390: Which of the following factors has no effect on the e.m.f. of a primary cell? Options:
  A) temperature
  B) size of the cell
  C) nature of the plate
  D) nature of the electrolyte
  Show Answer
  The correct answer is B .