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 651: The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the Options:
  A) Temperature of the refrigerator low and constant
  B) keep current supplied to the refrigerator below 5A
  C) Voltage supply constant
  D) Current supplies to the refrigeration
  Show Answer
  The correct answer is B .
• Question 652: A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is Options:
  A) 90%
  B) 80%
  C) 85%
  D) 87%
  Show Answer
  The correct answer is B .
• Question 653: An object is projected with a velocity of 80ms^-1 at an angle of 30^o to the horizontal.The maximum height reached is Options:
  A) 20m
  B) 80m
  C) 160m
  D) 320m
  Show Answer
  The correct answer is B .
• Question 654: A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12^oC is achieved, the specific heat capacity of the metal is Options:
  A) 400 J kg^-1K^-1
  B) 500 J kg^-1K^-1
  C) 390 J kg^-1K^-1
  D) 130 J kg^-1K^-1
  Show Answer
  The correct answer is B .
• Question 655:

  

  The net capacitance in the circuit above is

  Options:
  A) 80µF
  B) 6.0µF
  C) 4.0µF
  D) 2.0µF
  Show Answer
  The correct answer is D .
• Question 656: Of the following derived units, the one that is not a unit of power is Options:
  A) joule/second
  B) ampere volt
  C) ampere²/volt
  D) ohm²/volt
  E) volts²
  Show Answer
  The correct answer is C .
• Question 657: Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm. Options:
  A) 18.57NC${}^{-1}$
  B) 53.06NC${}^{-1}$
  C) 2.28NC${}^{-1}$
  D) 0.80NC${}^{-1}$
  Show Answer
  The correct answer is A .
• Question 658:

  I. The frictional force is independent of the area of the surfaces in conduct
  II. The frictional force depends on the nature of the surfaces in contact
  III. The frictional force depends on the speed of sliding
  IV. The frictional force is directly proportional to the normal reaction.

  Which combination of the above is true of sliding friction?

  Options:
  A) I, III and IV
  B) I, II and IV
  C) I, II and III
  D) II, III and IV
  Show Answer
  The correct answer is B .
• Question 659: An arrow of mass 0.1kg moving with a horizontal velocity of 15ms^-1 is shot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Their common velocity after impact is Options:
  A) 15.0 ms^-1
  B) 7.5 ms^-1
  C) 3.8 ms^-1
  D) 3.0 ms^-1
  Show Answer
  The correct answer is D .
• Question 660:

  A metal rod has a length of 100cm at 200${}^{o}C$. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 $\times$ 10${}^{-5}{C}^{-1}$

  Options:
  A) 200${}^o$C
  B) 300${}^o$C
  C) 100${}^o$C
  D) -100${}^o$C
  Show Answer
  The correct answer is D .