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 621: Which of the following statements is TRUE of photoelectric effect? Options:
  A) it cannot occur in liquids
  B) the energy of the emitted electrons is independent of the work function of the surface
  C) the energy of the emitted electron depends on the wavelength of the incident light
  D) the greater the intensity of the incuident light, the greater the incident of the emitted electron
  Show Answer
  The correct answer is A .
• Question 622: The atmospheric pressure due to water is 1.3 x 10⁶Nm^-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm^-3, g = 10ms^-2] Options:
  A) 1.3 x 10⁷Nm^-2
  B) 1.4 x 10⁶Nm^-2
  C) 1.4 x 10⁵Nm^-2
  D) 1.0 x 10 ⁵Nm^-2
  Show Answer
  The correct answer is B .
• Question 623:

  A source of sound produces waves in air of wavelength1.65m. If the speed of soundin air is 330ms${}^{-1}$, the period of vibration in air is?

  Options:
  A) 200
  B) 0.005
  C) 0.5
  D) 0.02
  Show Answer
  The correct answer is B .
• Question 624:

  A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?

  Options:
  A) 4.0 x 10²W
  B) 5.0 x 10²W
  C) 4.0 x 10³W
  D) 5.0 x 10³W
  Show Answer
  The correct answer is D .
• Question 625: What is the velocity of sound at 100 ^oC if the velocity of sound at 0 ^oC is 340ms ^-1? Options:
  A) 497m^-1
  B) 440m^-1
  C) 397m^-1
  D) 240m^-1
  Show Answer
  The correct answer is B .
• Question 626: PHCN measures its electrical energy in Options:
  A) W
  B) KWh
  C) Wh
  D) J
  Show Answer
  The correct answer is B .
• Question 627: Which of the following can be used to reduce local action in a Laclanche cell? Options:
  A) A carbon rod as the positive pole
  B) Pure zinc as the negative pole
  C) Potassium permanganate solution in contact with the positive pole
  D) common salt solution
  Show Answer
  The correct answer is C .
• Question 628:

  

  In the figure above, XY is of length 1m, The value of R at balance point Z is

  Options:
  A) 3.0Ω
  B) 13.3Ω
  C) 15.0Ω
  D) 30.0Ω
  Show Answer
  The correct answer is D .
• Question 629: Two cells each of e.m.f. 1.5V and an internal resistance 2$\mathrm{\Omega }$ are connected in parallel. Calculate the current flowing when the cells are connected to a 1$\mathrm{\Omega }$ resistor Options:
  A) 0.75$\mathrm{\Omega }$
  B) 1.5$\mathrm{\Omega }$
  C) 0.5$\mathrm{\Omega }$
  D) 1.0$\mathrm{\Omega }$
  E) 0.6$\mathrm{\Omega }$
  Show Answer
  The correct answer is A .
• Question 630:

  

  In the figure above, what is the angle of reflection of the ray of light at mirror M?

  Options:
  A) ${90}^{\circ }$
  B) ${60}^{\circ }$
  C) ${45}^{\circ }$
  D) ${30}^{\circ }$
  Show Answer
  The correct answer is B .