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 561: The lower and upper fixed points of a mecury-in-glass thermometer are marked Y and 180mm respectively. On a particular the mecury meniscus in the thermometer rises to 45mm. If the corresponding reading on a scale is 10^o, calculate the value of Y. Options:
  A) 4mm
  B) 18mm
  C) 30mm
  D) 135mm
  E) 450mm
  Show Answer
  The correct answer is C .
• Question 562: in a pure semiconductor, the number of electrons in the conduction band is Options:
  A) less than the number of holes in the valence band
  B) equal to the number of holes in the valence band
  C) greater than the number of holes in the valence band
  D) twice the number of holes in the valence band
  Show Answer
  The correct answer is B .
• Question 563: If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed? Options:
  A) 10 cm
  B) 15 cm
  C) 20 cm
  D) 25 cm
  Show Answer
  The correct answer is B .
• Question 564: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 565: The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60^o is Options:
  A) 25W
  B) 50W
  C) 120W
  D) 125W
  Show Answer
  The correct answer is A .
• Question 566: The melting point of a substance is equivalent to its Options:
  A) Vapour Pressure
  B) Solidification Temperature
  C) Liquidification Temperature
  D) Solidification Pressures
  Show Answer
  The correct answer is B .
• Question 567: A concave lens of focal length 20cm form an image 1/2 the size of the object. The object distance is Options:
  A) 100cm
  B) $\frac{100}{q}$
  C) 60cm
  D) $\frac{60}{7}$
  E) None of the above
  Show Answer
  The correct answer is C .
• Question 568: When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The ratio of the specific heat capacity of P to Q is Options:
  A) 1 : 4
  B) 4 : 1
  C) 1 : 1
  D) 2 : 1
  Show Answer
  The correct answer is C .
• Question 569:

  

  The image above shows an inverted U-tube with the open end, O of one limb below the level, W of water in the tank, in order that water should begin to flow from the tank it is is necessary that

  Options:
  A) The U-tube is completely filled with water and that P should be higher that W
  B) P should be lower than O and W
  C) P should be lower than W and O should reach the botton of the table
  D) The U-tube is completely filled with water and that P should be lower that W
  Show Answer
  The correct answer is B .
• Question 570: A hot metal ball is suspended in the open air. As it cools it loses heat by Options:
  A) conduction only
  B) convection only
  C) radiation only
  D) conduction and convection
  E) convection and evaporation
  Show Answer
  The correct answer is B .