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 1871:

  A body falls freely under gravity (g = 9.8ms^-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

  Options:
  A) 784ms^-1
  B) 80ms^-1
  C) 78.4ms^-1
  D) 39.2ms^-1
  E) 27.7ms^-1
  Show Answer
  The correct answer is E .
• Question 1872: Heat is supplied uniformly at the rate of 100W to 1.0 x 10^-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5^oC, then the specific heat capacity of the liquid is Options:
  A) 2.0 x 10²Jkg^-1k^-1
  B) 2.0 x 10²Jkg^-1
  C) 4.0 x 10⁴Jkg^-1k^-1
  D) 4.0 x 10⁴kg^-1
  E) 8.4 x 10³Jkg^-1k^-1
  Show Answer
  The correct answer is C .
• Question 1873: If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called Options:
  A) Doppler effect
  B) Resonance
  C) Ultra sound
  D) Diffraction of sound
  E) Rarefaction
  Show Answer
  The correct answer is A .
• Question 1874:
  

  The property of wave shown in the diagram above is?

  Options:
  A) Diffraction
  B) Refraction
  C) Polarisation
  D) Interference
  Show Answer
  The correct answer is A .
• Question 1875: Which of the following is a percussion instrument? Options:
  A) Flute
  B) Organ
  C) Bell
  D) Piano
  E) Sonometer
  Show Answer
  The correct answer is C .
• Question 1876: An a.c. generator can be converted into a d.c. generator by replacing Options:
  A) the slip rings with split-ring commutators
  B) the slip rings with armatures
  C) the split-rings with slip rings
  D) the split-rings with brushes
  E) the brushes with slip-ring commutators.
  Show Answer
  The correct answer is A .
• Question 1877: In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to Options:
  A) volt, ampere and hertz
  B) ohms, volt and hertz
  C) watt, ohms and radian
  D) ohms, hertz and joule
  Show Answer
  The correct answer is B .
• Question 1878: Which of the following properties makes metals ideal for cooking utensils? Options:
  A) high coefficient of expansion
  B) good conduction of heat
  C) low specific heat capacity
  D) poor radiation of heat
  Show Answer
  The correct answer is B .
• Question 1879: blowing air over a liquid aids evaporation by Options:
  A) increasing its surface area
  B) decreasing its vapour pressure
  C) increasing its temperature
  D) decreasing its density
  Show Answer
  The correct answer is A .
• Question 1880: A bar of initial length /₀ is heated through a temperature change $\mathrm{\Delta }$t to a new length I. The linear expansivity, a, of the bar is Options:
  A) $\frac{/-{/}_o}{/\mathrm{\Delta }t}$
  B) $\frac{/-{/}_o}{{/}_o\mathrm{\Delta }t}$
  C) /_o(1 + $\mathrm{\Delta }$ t)
  D) $\frac{/-{/}_o}{/(1+\mathrm{\Delta }t)}$
  Show Answer
  The correct answer is B .