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 1381:

  

  In the diagram given the hanging mass m₂ is adjusted until m₁ is on the verge of sliding. The coefficient of static

  Options:
  A) $\frac{m_1}{m_2}$
  B) $\frac{m_{1}g}{m_2}$
  C) $\frac{m_2}{m_1}$
  D) $\frac{m_{2}g}{m_1}$
  Show Answer
  The correct answer is C .
• Question 1382: A 40-W instrument has a resistance of 90$\mathrm{\Omega }$. On what voltage should it be operated normally? Options:
  A) 60V
  B) 150V
  C) 225V
  D) 3600V
  Show Answer
  The correct answer is A .
• Question 1383: The strength of an electromagnet increase with Options:
  A) Increase in the number of turn of the coil
  B) Decrease in current with the coil
  C) Increase in the distance between the pole
  D) Increase in current without the coil
  Show Answer
  The correct answer is A .
• Question 1384: A platinum resistance thermometer wire has a resistance of 5 ohms at 0^oC and 5.5 ohms at 100^oC. Calculate the temperature of the wire when the resistance is 5.2 ohms Options:
  A) 80^oC
  B) 60^oC
  C) 40^oC
  D) 10^oC
  Show Answer
  The correct answer is C .
• Question 1385: A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct? Options:
  A) The cap will be positively charged and the will be negatively charged
  B) The cap will be negatively charged and the leaf will be positively changed
  C) The cap and the leaf will be positively charged
  D) The cap and the leaf will be negatively charged
  E) none
  Show Answer
  The correct answer is D .
• Question 1386: An element and its isotope only differ in the number of Options:
  A) protons
  B) electrons
  C) ions
  D) neutrons
  Show Answer
  The correct answer is D .
• Question 1387:

  Which of the following has the lowest internal resistance when new?

  Options:
  A) Leclanche cell
  B) Daniell cell
  C) Torch battery
  D) Accumulator
  Show Answer
  The correct answer is D .
• Question 1388: An air bubble of volume 4cm³ is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10cm of water? Options:
  A) 2cm³
  B) 4cm³
  C) 6cm³
  D) 8cm³
  E) 12cm³
  Show Answer
  The correct answer is E .
• Question 1389: The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz? Options:
  A) 7500m
  B) 300m
  C) 75m
  D) 15m
  Show Answer
  The correct answer is B .
• Question 1390: In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the Options:
  A) load and the extension
  B) load and the radius of the wire
  C) radius of the wire and the extension
  D) extension and the original length of the wire
  Show Answer
  The correct answer is B .