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 951: A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4. Options:
  A) 343.32N
  B) 233.33N
  C) 333.33N
  D) 334.33N
  Show Answer
  The correct answer is C .
• Question 952: The pressure of a gas when cooled at constant volume will decrease because the molecules Options:
  A) collide less frequently with the walls of the container
  B) have the same average kinetic energy
  C) break up into smaller molecules
  D) decrease in number
  Show Answer
  The correct answer is A .
• Question 953:

  T(oC)	0	5	10	15	20	40	60
  S.V.P (mmHg)	4.58	6.51	8.94	12.67	17.50	55.10	149.00

  The table above shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20^oC is 10mmHg, what is the relative humidity?

  Options:
  A) 170.0%
  B) 57.0%
  C) 17.5%
  D) 10.0%
  Show Answer
  The correct answer is B .
• Question 954:

  I. The number of neutrons released exceeds the number that caused the fission.

  II. There is loss of mass.

  III. Energy is produced.

  IV. Smaller nuclei merge to form larger nuclei

  Which of the statement above are correct about nuclear fission?

  Options:
  A) II,III and IV only
  B) I, II and IV only
  C) I,II and III only
  D) I, III and IV only
  Show Answer
  The correct answer is C .
• Question 955:

  

  In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be

  Options:
  A) south and north
  B) north and south
  C) north and north
  D) south and south
  Show Answer
  The correct answer is C .
• Question 956: A body whose mass is 2kg and has a volume of 500cm just floats when completely immersed in a liquid. Calculate the density of the liquid Options:
  A) 4.0 x 10²kgm^-3
  B) 4.0 x 10³kgm^-3
  C) 1.0 x 10³kgm^-3
  D) 1.0 x 10⁶kgm^-3
  Show Answer
  The correct answer is B .
• Question 957:

  The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .
• Question 958:

  

  Find the effective resistance in the diagram above

  Options:
  A) 6 Ω
  B) 12 Ω
  C) 18 Ω
  D) 24 Ω
  Show Answer
  The correct answer is D .
• Question 959: Total internal reflection occurs when light moves from Options:
  A) a dense medium to a less dense medium
  B) air to water
  C) water to glass
  D) a less dense to a dense medium
  Show Answer
  The correct answer is A .
• Question 960:

  A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

  Options:
  A) 100${}^o$C
  B) 248${}^o$C
  C) 250${}^o$C
  D) 350${}^o$C
  Show Answer
  The correct answer is C .