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 641: A simple pendulum with a period of 2.0s has its length doubled. Its new period is Options:
  A) 1.00s
  B) 1.41s
  C) 0.3s
  D) 2.83s
  E) 4.00s
  Show Answer
  The correct answer is D .
• Question 642: The bond between silicon and germanium is Options:
  A) dative
  B) covalent bond
  C) trivalent
  D) ionic
  Show Answer
  The correct answer is B .
• Question 643:

  Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;

  Specific heat capacity of copper = 400JKg^-1K^-1

  Latent heat of fusion of ice = 3.3 x 10⁵JKg^-1

  Options:
  A) 8/33kg
  B) 33/80kg
  C) 80/33kg
  D) 33/8kg
  Show Answer
  The correct answer is A .
• Question 644: The total length of a spring when a mass of 20g is hung from its end is 14cm, while its total length is 16cm when a mass of 30g is hung from the same end. Calculate the unstretched length of the spring assuming Hooke's law is obeyed. Options:
  A) 9.33cm
  B) 10.00cm
  C) 10.66cm
  D) 12.00cm
  E) 15.00cm
  Show Answer
  The correct answer is B .
• Question 645: The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is Options:
  A) 1600N
  B) 400N
  C) 160N
  D) 40N
  Show Answer
  The correct answer is A .
• Question 646:

  When the breaks in a car are applied, the frictional force on the tyresis?

  Options:
  A) a disadvantage because it is in the direction of the motion of the car
  B) a disadvantage because it is in the opposite direction of the motion of the car
  C) an advantage because it is in the direction of the motion of the car
  D) an advantage because it is in the opposite direction of the motion of the car
  Show Answer
  The correct answer is D .
• Question 647: Total eclipse of the sun occurs when the Options:
  A) earth is between the moon and the sun
  B) sun is between the moon and the earth
  C) moon is between the sun and the earth
  D) ozone layer is threatened
  Show Answer
  The correct answer is C .
• Question 648:

  At what frequency would a capacitor of 2.5μF

  Used in radio circuit have a resistance of 250Ω

  Options:
  A) π/800 Hz
  B) 800/π Hz
  C) 200π Hz
  D) 2000π Hz
  Show Answer
  The correct answer is B .
• Question 649:

  A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?

  Options:
  A) 20
  B) 250
  C) 200
  D) 500
  Show Answer
  The correct answer is D .
• Question 650:

  

  The total capacitance of the circuit above is

  Options:
  A) 0.25mF
  B) 0.50mF
  C) 0.75mF
  D) 1.25mF
  E) 1.50mF
  Show Answer
  The correct answer is E .