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 1591: The efficiency of a machine is always less than 100% because the Options:
  A) work output is always greater than the work input
  B) load lifted is always greater than the effort applied
  C) effort applied is always greater than the load lifted
  D) velocity ratio is always greater than the mechanical advantage
  Show Answer
  The correct answer is D .
• Question 1592: Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane? Options:
  A) Random and rotational
  B) Rotational and oscillatory
  C) Rotational only
  D) Translations only
  E) Translational and rotational
  Show Answer
  The correct answer is E .
• Question 1593: A body whose mass is 2kg and has a volume of 500cm just floats when completely immersed in a liquid. Calculate the density of the liquid Options:
  A) 4.0 x 10²kgm^-3
  B) 4.0 x 10³kgm^-3
  C) 1.0 x 10³kgm^-3
  D) 1.0 x 10⁶kgm^-3
  Show Answer
  The correct answer is B .
• Question 1594: A radioactive isotope has a half-life of 8 days. What fraction of the atoms will remain after 72 days? Options:
  A) 9.766 × 10^-4
  B) 1.736 ×10^-3
  C) 1.953 ×10^-3
  D) 3.472 × 10^-3
  E) 3.906 x 10^-3
  Show Answer
  The correct answer is C .
• Question 1595: The quantity (timbre) of sound depends on Options:
  A) amplitude
  B) frequency
  C) harmonics
  D) velocity
  E) wavelength
  Show Answer
  The correct answer is C .
• Question 1596: The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz? Options:
  A) 4
  B) 3
  C) 2
  D) 1
  Show Answer
  The correct answer is B .
• Question 1597: A simple pendulum, 0.6m long, has a period of 1.5s. What is the period of a similar pendulum of 0.4m length in the same location? Options:
  A) $1.5\frac{\sqrt{2}}{3}$s
  B) $1.5\frac{\sqrt{3}}{2}$s
  C) 2.25s
  D) 1.00s
  E) 2.00s
  Show Answer
  The correct answer is A .
• Question 1598: 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 1599: A thin aluminum plate has a surface area of 1500m at 20^oC. What will be its surface area when it is cooled to -20^oC? (Take the linear expansivity of aluminum to be 2.5 x 10^-5k^-1). Options:
  A) 1.503m²
  B) 1.500m²
  C) 1.498m²
  D) 1.497m²
  E) 1.490m²
  Show Answer
  The correct answer is C .
• Question 1600: What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42? Options:
  A) 21^o
  B) 22^o
  C) 23^o
  D) 24^o
  Show Answer
  The correct answer is D .