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 121: Which statement is NOT correct about molecules? Options:
  A) The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.
  B) Molecules are made up of atoms
  C) The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas
  D) Molecules of gases are in regular motion
  E) Molecules of a solid vibrate about their mean positions.
  Show Answer
  The correct answer is D .
• Question 122: One of the features of the fission process is that Options:
  A) its products are not radioactive
  B) it leads to chain reaction
  C) neutrons are not released
  D) the sum of the masses of the reactants equals the sum of masses of the products
  Show Answer
  The correct answer is B .
• Question 123: A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object? Options:
  A) 12cm
  B) 24cm
  C) 48cm
  D) 108cm
  Show Answer
  The correct answer is B .
• Question 124:

  

  In the diagram above, the neutral point is at

  Options:
  A) R
  B) X
  C) S
  D) P
  Show Answer
  The correct answer is B .
• Question 125: The velocity of sound in air will be doubled if it's absolute temperature is Options:
  A) Quadrupled
  B) Constant
  C) Halved
  D) Doulbed
  Show Answer
  The correct answer is A .
• Question 126: A series RLC circuit is said to resonate, when Options:
  A) capacitive reactance is zero
  B) conductance is maximum
  C) current is minimum
  D) impedance is minimum
  E) inductive reactance is zero
  Show Answer
  The correct answer is D .
• Question 127: In a resonance tube experiment, a tube fixed length is closed at one end and several tuning forks of increasing frequency used to obtain resonance at the open end. If the tuning fork with the lowest frequency which gave resonance had a frequency f₁ and the next tuning fork to give resonance had a frequency f₂, find the ratio $\frac{f^2}{f^2}$. Options:
  A) 8
  B) 3
  C) 2
  D) $\frac{1}{2}$
  E) $\frac{1}{3}$
  Show Answer
  The correct answer is B .
• Question 128: In a projection lantern of focal length f, the object distance u, is such that Options:
  A) u > 2f > f
  B) u < f < 2f
  C) u = f < 2f
  D) f < u < 2f
  Show Answer
  The correct answer is D .
• Question 129: Three electric cells each of e.m.f 1.5V and internal resistance of 1.0$\mathrm{\Omega }$ are connected in parallel across an external resistance of $\frac{2}{3}$$\mathrm{\Omega }$. Calculate the value of the current in the resistor Options:
  A) 0.5 A
  B) 0.9A
  C) 1.5A
  D) 4.5A
  Show Answer
  The correct answer is C .
• Question 130: 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 .