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 801:

  

  The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

  Options:
  A) At J, the wire becomes plastic
  B) J is the yield point
  C) L is the elastic limit
  D) At K, the wire breaks
  Show Answer
  The correct answer is B .
• Question 802:

  A string is sustaining a stationary wave when

  Options:
  A) the frequency of the wave is not proportional to the wavelength of the wave
  B) the amplitude of vibration is always zero
  C) two equal waves are travelling in opposite directions
  D) the waves are longitudinal
  E) the frequency is directly proportional to the length of the string
  Show Answer
  The correct answer is C .
• Question 803: What is the cost of running seven 40 W lamps and five 80 W la mps for 12 hours of the electrical energy cost N7.00kWk? Options:
  A) N80.00
  B) N45.36
  C) N65.00
  D) N57.12
  Show Answer
  The correct answer is D .
• Question 804: The specific latent heat of vaporization of a substance is always Options:
  A) less than its specific latent heat of fusion
  B) greater than its specific heat of fusion
  C) equal to its specific latent heat of fusion
  D) all of the above depending on the nature of the substance
  E) none of the above
  Show Answer
  The correct answer is B .
• Question 805: When an a.c. voltage is applied to a capacitor, no power is consumed because the current Options:
  A) leads the voltage by 90°
  B) lags behind the voltage by 90°
  C) and voltage are in phase
  D) and voltage are 180° out of phase
  Show Answer
  The correct answer is A .
• Question 806: A ray of light is incident at an angle of 30^o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray? Options:
  A) 60^o
  B) 39^o
  C) 28^o
  D) 0^o
  Show Answer
  The correct answer is D .
• Question 807: The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is Options:
  A) 0.5 $\mathrm{\Omega }$
  B) 1.0$\mathrm{\Omega }$
  C) 2.0$\mathrm{\Omega }$
  D) 4.0$\mathrm{\Omega }$
  Show Answer
  The correct answer is C .
• Question 808:

  A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

  Options:
  A) 1.25 x 10${}^4$W
  B) 2.50x 10${}^4$W
  C) 1.25 x 10${}^6$W
  D) 2.50 x 10${}^6$W
  Show Answer
  The correct answer is A .
• Question 809: A perfect emitter or absorber of radiant energy is a Options:
  A) conductor
  B) black body
  C) white body
  D) red body
  Show Answer
  The correct answer is B .
• Question 810: Which of these statements are correct for the pressures in liquids? i. pressure in a liquid at a point acts equally in all directions. ii. pressure increases with depth. iii. pressure at a depth depends on the shape of the container. iv. pressure at the same depth in different liquids are proportional to the density at different liquids. Options:
  A) i, ii, iii only
  B) i, ii, iv only
  C) i, iii, iv only
  D) ii, iii, iv only
  Show Answer
  The correct answer is B .