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 force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is Options:
  A) centrifugal
  B) rotational
  C) reaction
  D) centripetal
  E) tractional
  Show Answer
  The correct answer is D .
• Question 562: Which of the following statements is correct about light and sound waves? Both Options:
  A) are longitudinal waves
  B) are transverse waves
  C) have the same velocity in air
  D) need a medium for propagation
  E) transmit energy
  Show Answer
  The correct answer is E .
• Question 563: A radioactive substance has a half-life of 3 minutes. After 9 minutes, the count rate was observed to be 200. What was the count rate at zero time? Options:
  A) 200
  B) 1200
  C) 1600
  D) 2400
  E) 4800
  Show Answer
  The correct answer is C .
• Question 564: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .
• Question 565:

  400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 300°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)

  Options:
  A) 10°C
  B) 15°C
  C) 20°C
  D) 30°C
  E) 40°C
  Show Answer
  The correct answer is A .
• Question 566: Which of the following factors has no effect on the e.m.f. of a primary cell? Options:
  A) temperature
  B) size of the cell
  C) nature of the plate
  D) nature of the electrolyte
  Show Answer
  The correct answer is B .
• Question 567:

  I. Wavelength

  II. Medium of propagation

  III. Wave velocity

  IV. Frequency

  V. Energy

  Which of the above are used for characterizing waves?

  Options:
  A) I, II and V
  B) I and IV
  C) I, III and IV
  D) III, IV and V
  Show Answer
  The correct answer is C .
• Question 568: An observer with normal eyes views an object with magnifying glass of focal length 5 cm. the angular magnification is?
  [least distance of distinct vision D = 25 cm] Options:
  A) -6
  B) -5
  C) 5
  D) 6
  Show Answer
  The correct answer is A .
• Question 569: Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing Options:
  A) a larger number of turns in the coil
  B) a thinner suspension with a small torsional control
  C) a special alloy permanent magnet which gives a high magnetic flux
  D) all of the above
  E) a light source with a greater intensity
  Show Answer
  The correct answer is D .
• Question 570: Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct Options:
  A) The two kettles will cool down at the same rate
  B) the polished kettle cools down more quickly by conduction
  C) the kettle covered with soot cools down more quickly because it is a good radiator
  D) the kettle covered with soot cools down more quickly by the process of heat convection
  Show Answer
  The correct answer is C .