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 1461:

  An air bubble of radius 4.5 cm initially at a depth of 12 m below the water surface rises to the surface. If the atmospheric pressure is equal to 10.34 m of water, the radius of the bubble just before it reaches the water surface is

  Options:
  A) 6.43 cm
  B) 8.24 cm
  C) 4.26 cm
  D) 5.82 cm
  Show Answer
  The correct answer is D .
• Question 1462: 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 1463: 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 .
• Question 1464: Which of the following does NOT cause a reduction of the surface tension of water? Options:
  A) soap solution
  B) detergent
  C) alcohol
  D) camphor
  E) grease
  Show Answer
  The correct answer is E .
• Question 1465: Total eclipse of the sun occurs when the Options:
  A) earth is between the moon and the sun
  B) sun is between the moon and the earth
  C) moon is between the sun and the earth
  D) ozone layer is threatened
  Show Answer
  The correct answer is C .
• Question 1466: A progressive wave is represented by $y=10\text{Sin}(1000\pi t-\frac{\pi x}{34})$ . two layers of the wave separated by 153cm have a phase difference of Options:
  A) 270⁰
  B) 45⁰
  C) 90⁰
  D) 180⁰
  E) No Correct Option
  Show Answer
  The correct answer is E .
• Question 1467:

  Which of the following types of electromagnetic waves is used in night vision goggles?

  Options:
  A) Microwaves
  B) Ultraviolet waves
  C) Infrared waves
  D) Radio waves
  Show Answer
  The correct answer is C .
• Question 1468: A platinum resistance thermometer wire has a resistance of 5 ohms at 0^oC and 5.5 ohms at 100^oC. Calculate the temperature of the wire when the resistance is 5.2 ohms Options:
  A) 80^oC
  B) 60^oC
  C) 40^oC
  D) 10^oC
  Show Answer
  The correct answer is C .
• Question 1469:

  

  The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by

  Options:
  A) moving Q nearer to O
  B) moving P nearer to O
  C) addding a weight Q to Q
  D) moving P further away from O
  Show Answer
  The correct answer is B .
• Question 1470: A series RLC circuit is said to resonate, when Options:
  A) capacitive reactance is zero
  B) conductance is maximum
  C) current is minimum
  D) impedance is minimum
  E) inductive reactance is zero
  Show Answer
  The correct answer is D .