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 441:

  During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because

  Options:
  A) all the heat is used to break the bonds holding the molecules of the solid together
  B) the heat capacity has become very large as the substance melts
  C) the heat energy is quickly conducted away
  D) the heat gained is equal to the heat lost by the substance
  Show Answer
  The correct answer is A .
• Question 442:

  I. Jet propelled aircraft

  II. Rocket propulsion

  III. The recoil of a gun

  IV. A person walking

  Which of the above is based on Newton's third law of motion

  Options:
  A) I and II only
  B) I, II, III, and IV only
  C) I and III only
  D) I, II and III only
  Show Answer
  The correct answer is D .
• Question 443: The mass of a specific gravity bottle is 15.2g when it is empty. it is 24.8g when filled with kerosene and 27.2g when filled with distilled water. Calculate the relative density of kerosene Options:
  A) 1.25
  B) 1.10
  C) 0.90
  D) 0.80
  Show Answer
  The correct answer is D .
• Question 444:
  

  For a pear-shaped conductor shown above, the concentration of charge on the outside is highest at?

  Options:
  A) X
  B) Z
  C) Y
  D) K
  Show Answer
  The correct answer is A .
• Question 445:

  The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 180Hz?

  Options:
  A) 4
  B) 3
  C) 2
  D) 1
  Show Answer
  The correct answer is B .
• Question 446: A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is Options:
  A) 60.0ms^-1
  B) 6.0ms^-1
  C) 1.5ms^-1
  D) 0.6ms^-1
  Show Answer
  The correct answer is D .
• Question 447: A calorimeter of thermal capacity 80J contains 20g of water at 25^oC. Water at 100^oC is added so that the final temperature of the set-ups is 50^oC. The amount of water added is (Heat capacity of water = 4.18J/g/^oC) Options:
  A) 20g
  B) 25g
  C) 45g
  D) 50g
  E) 100g
  Show Answer
  The correct answer is A .
• Question 448: Which of the following can be used to reduce local action in a Laclanche cell? Options:
  A) A carbon rod as the positive pole
  B) Pure zinc as the negative pole
  C) Potassium permanganate solution in contact with the positive pole
  D) common salt solution
  Show Answer
  The correct answer is C .
• Question 449:

  The following are parts of the eye

  I. Retina

  II. Pupil

  III. Iris

  The correct equivalent in the camera in the same order are

  Options:
  A) Diaphragm, Aperture, film
  B) Aperture, Diaphragm, Film
  C) Film, Diaphragm, Aperture
  D) Film, Aperture, Diaphragm
  Show Answer
  The correct answer is D .
• Question 450:

  A source of sound produces waves in air of wavelength1.65m. If the speed of soundin air is 330ms${}^{-1}$, the period of vibration in air is?

  Options:
  A) 200
  B) 0.005
  C) 0.5
  D) 0.02
  Show Answer
  The correct answer is B .