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 721: A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s^-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is Options:
  A) 8V
  B) 16V
  C) 20V
  D) 80V
  Show Answer
  The correct answer is D .
• Question 722: In a gas experiment, if the volume of the gas is plotted against the reciprocal of the pressure, the unit of the slope of the resulting curve is Options:
  A) force
  B) temperature
  C) power
  D) work
  Show Answer
  The correct answer is D .
• Question 723: From the generating station to each substation power is transmitted at a very high voltage so as to reduce Options:
  A) hysteresis loss
  B) eddy current loss
  C) magnetic flux leakage
  D) heating in the cells
  Show Answer
  The correct answer is B .
• Question 724: Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight. Options:
  A) i only
  B) ii only
  C) i and iii only
  D) ii and iii only
  Show Answer
  The correct answer is D .
• Question 725: A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine? Options:
  A) 60%
  B) 50%
  C) 40%
  D) 2%
  Show Answer
  The correct answer is B .
• Question 726: A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g mass is placed on the pan of the same spring balance, the extension is Options:
  A) 3.3cm
  B) 6.5cm
  C) 7.5cm
  D) 10.8cm
  E) 15.0cm
  Show Answer
  The correct answer is C .
• Question 727: In a Daniel cell, the depolarizer, positive and negative electrodes are respectively Options:
  A) copper sulphate, copper and zinc
  B) manganese dioxide, carbon and zinc
  C) sulphuric acid, lead oxide and lead
  D) potassium hydroxide, nickel and iron.
  Show Answer
  The correct answer is A .
• Question 728: The pair of physical quantities consisting of vectors only are Options:
  A) momentum and power
  B) velocity and distance
  C) displacement and torgue
  D) accelaration and speed
  Show Answer
  The correct answer is C .
• Question 729: A note is called an octave of another note when Options:
  A) its frequency is twice that of the first note
  B) its frequency is half of the first note
  C) the notes have the same fundamental frequency
  D) its periodic time is twice that of the first note
  Show Answer
  The correct answer is A .
• Question 730: What charge is stored in a 0.1F capacitor when a 10V supply is connected across it? Options:
  A) 1C
  B) 5C
  C) 4C
  D) 2C
  Show Answer
  The correct answer is A .