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 821: If the inclination at Ibadan is 7^oS, this means that Options:
  A) the angle between the geographic meridian and the magnetic meridian at Ibadan is 7^o
  B) the earth's magnetic intensity at Ibadan makes angle 7^o with the horizontal direction
  C) a magnetic needle will be inclined at 7^o to the vertical at Ibadan
  D) the north pole of a magnetic needle dips downward at Ibadan
  Show Answer
  The correct answer is B .
• Question 822: the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is Options:
  A) 3
  B) 1.5
  C) 1.32
  D) 1
  E) 0.67
  Show Answer
  The correct answer is E .
• Question 823:

  

  In the figure above, the work done by the force of 100N inclined at an angle of 60^o to the object dragged horizontally to a distance of 8m is

  Options:
  A) 800J
  B) 600J
  C) 100J
  D) 400J
  Show Answer
  The correct answer is D .
• Question 824:
  

  Three forces with magnitudes 16 N, 12 N and 21 N are shown in the diagram below. Determine the magnitude of their resultant force and angle with the x-axis

  Options:
  A) 7.63N,61°
  B) 8.71N,61°
  C) 7.63N,29°
  D) 8.71N,29°
  Show Answer
  The correct answer is B .
• Question 825:

  Particles of mass 10${}^{-2}$kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad${}^{-1}$. If the radius of the blade is 0.2m, the centripetalforce is?

  Options:
  A) 2N
  B) 20N
  C) 200N
  D) 400N
  Show Answer
  The correct answer is B .
• Question 826:

  

  PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move

  Options:
  A) Upwards
  B) Downwards
  C) TOwards The North Pole
  D) Towards The South Pole
  Show Answer
  The correct answer is A .
• Question 827: The relationship between the period T and the length T of a smile pendulum is T = 2$\pi$ $(\frac{I}{g}{)}^{\frac{1}{2}}$. From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I² iii. T² vs. I iv. T vs $\sqrt{I}$ v. logT vs logI. Which of the following graphs, are linear? Options:
  A) all
  B) only i and ii
  C) only iii and iv
  D) iii,iv and v
  E) none of them
  Show Answer
  The correct answer is D .
• Question 828: Which of the following statements about electrolysis is NOT correct? Options:
  A) The substances in solution in the electrolyte become ionized
  B) Ions are electrically charged and are attracted towards electrodes when a potential difference is applied
  C) Ions may be discharged at the electrodes, forming bubbles or deposits
  D) The mass deposited depends upon the length of time for which current flows
  E) The mass of gas set free or metal deposited is proportional to the square of the current
  Show Answer
  The correct answer is E .
• Question 829:

  A binary operation $\otimes$ defined on the set of integers is such that m $\otimes$ n = m + n + mn for all integers m and n. Find the inverse of -5 under this operation, if the identity element is 0

  Options:
  A) $\frac{-5}{4}$
  B) $\frac{-5}{6}$
  C) o
  D) 5
  Show Answer
  The correct answer is A .
• Question 830:

  

  In the figure above, a lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms^-2]

  Options:
  A) 9N
  B) 18N
  C) 20N
  D) 200N
  Show Answer
  The correct answer is D .