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 151: An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generatoris 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated? Options:
  A) 11:1
  B) 1:11
  C) 12:11
  D) 11:12
  Show Answer
  The correct answer is C .
• Question 152:

  An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 $P_a$, what is the absolute pressure in $P_a$ in the tank if the height of the mercury in the open tube is 25 cm higher. density of mercury = $13600kg/m^3,g=9.8m/s^2$

  Options:
  A) 108,986 Pa
  B) 165,238 Pa
  C) 122,364 Pa
  D) 134,645 Pa
  Show Answer
  The correct answer is D .
• Question 153: What is the least possible error encountered when taking measurement with a meter rule? Options:
  A) 0.1mm
  B) 1.0mm
  C) 0.5mm
  D) 0.2mm
  Show Answer
  The correct answer is C .
• Question 154: The charge carriers in gasses are Options:
  A) ions only
  B) electrons and ions
  C) electrons and holes
  D) electrons only
  Show Answer
  The correct answer is A .
• Question 155: The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is Options:
  A) longer than 700nm
  B) shorter than 700nm but longer then 400nm
  C) 550nm
  D) shorter than 400nm
  E) infinite
  Show Answer
  The correct answer is D .
• Question 156: The following are some units i. Ns ii. Mm iii. Nm^-2 iv. J^oK^-1. What are the units of latent heat? Options:
  A) i
  B) ii
  C) iii
  D) iv
  Show Answer
  The correct answer is D .
• Question 157: A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done? Options:
  A) 80 J
  B) 500 J
  C) 300 J
  D) 120 J
  Show Answer
  The correct answer is B .
• Question 158:

  

  In the diagram above, which of the angles ${\theta }_1$ , ${\theta }_2$ , ${\theta }_3$ and ${\theta }_4$ is the angle of deviation of the ray of light passing through the glass prism XYZ?

  Options:
  A) ${\theta }_3$
  B) ${\theta }_2$
  C) ${\theta }_1$
  D) ${\theta }_4$
  Show Answer
  The correct answer is C .
• Question 159: A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is Options:
  A) 0.5 msec^-1
  B) 1.5 msec^-1
  C) 1 msec^-1
  D) 2 msec^-1
  E) 4 msec^-1
  Show Answer
  The correct answer is C .
• Question 160: A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was Options:
  A) 10⁵J
  B) 2.5 x 10³J
  C) 2 x 10³J
  D) 5 x 10³J
  E) 5 x 10^5J`
  Show Answer
  The correct answer is A .