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 71:
  

  Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg

  [Take g = 9.8 ms-2]

  Options:
  A) $T_1$ = 2864 N, $T_2$= 3612 N
  B) $T_1$= 3612 N, $T_2$ = 2864 N
  C) $T_1$= 3502 N, $T_2$= 2760 N
  D) $T_1$ = 2760 N, $T_2$ = 3502 N
  Show Answer
  The correct answer is C .
• Question 72: The ratio of the coefficient of linear expansion of two metals ^∝₁/_∝2 is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, ^e₁/_e2 is 1:2, the ratio of the original lengths ^l₁/_l2 is Options:
  A) ⁸/₃
  B) ³/₂
  C) ²/₃
  D) ³/₈
  Show Answer
  The correct answer is C .
• Question 73: The radiator of a motor car is cooled by Options:
  A) radiation
  B) conduction
  C) convection
  D) radiation and conduction
  Show Answer
  The correct answer is C .
• Question 74:

  The inner diameter of a test tube can be measured accurately using a?

  Options:
  A) micrometer screw gauge
  B) pair of dividers
  C) meter rule
  D) pair of vernier calipers
  Show Answer
  The correct answer is D .
• Question 75: A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is Options:
  A) 9.6J
  B) 2.4J
  C) 12.0J
  D) 7.2J
  Show Answer
  The correct answer is B .
• Question 76: A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is Options:
  A) 1 . 25 x 10⁴ W
  B) 2 . 50 x 10⁴ W
  C) 1 . 25 x 10⁶W
  D) 2 . 50 x 10⁶ W
  Show Answer
  The correct answer is B .
• Question 77:

  According to kinetic molecular model, in gases

  Options:
  A) The molecules are very fast apart and occupy all the space made available.
  B) The particles occur in clusters with molecules slightly farther apart.
  C) The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern.
  D) The particles vibrate about fixed positions and are held together by the strong inter-molecular bond between them.
  Show Answer
  The correct answer is A .
• Question 78: A magnet is similar to a bipolar charged system in that Options:
  A) it consists of two opposite poles - the north and south poles
  B) the earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole
  C) the force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges
  D) A and B only
  E) A and C only
  Show Answer
  The correct answer is E .
• Question 79: The pressure on the gas of constant gas thermometer at the ice point is 325mm of mercury and at the steam point is 875mm of mercury. Find the temperature when the pressure of the gas is 190mm of mercury Options:
  A) 30k
  B) 243k
  C) 300k
  D) 3003k
  Show Answer
  The correct answer is B .
• Question 80:

  Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

  Options:
  A) heat ----> Light----> Sound ----> Kinetic
  B) Kinetic ----> Light ----> Heat ----> Electricity
  C) heat ----> Kinetic ----> Electricity ----> Heat and Light
  D) electricity ----> Kinetic ----> Heat ----> Light
  Show Answer
  The correct answer is C .