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 161:

  Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkg${}^1$k${}^{-1}$, latent heat of fusion of ice = 3.3 x 10${}^5$Jkg${}^{-1}$)

  Options:
  A) $\frac{8}{33}$kg
  B) $\frac{3.3}{80}$kg
  C) $\frac{80}{33}$kg
  D) $\frac{3.3}{8}$kg
  Show Answer
  The correct answer is A .
• Question 162: The length of a side of a metallic cube at 20^oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10^-5k^-1, find the volume of the cube at 120^oC . Options:
  A) 126.50cm³
  B) 126.25cm³
  C) 126.00cm³
  D) 125.00cm³
  Show Answer
  The correct answer is A .
• Question 163:

  The velocity y of a particle in a time t is given by the equation

  Y = 10 + 2t²

  Find the instantaneous acceleration after 5 seconds

  Options:
  A) 60 ms^-2
  B) 20 ms^-2
  C) 15 ms^-2
  D) 10 ms^-2
  Show Answer
  The correct answer is B .
• Question 164: An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if Options:
  A) the final image is at the near-point
  B) the image formed by the objective is before the focus of the eye piece
  C) the angular magnification is the ratio of the focal length of the eye-piece lens to that of the objective
  D) the foci dl the objective and the eye-piece coincide between the lenses
  E) the distance between the objective lens and the eye-piece is equal to the difference between their focal lengths.
  Show Answer
  The correct answer is D .
• Question 165: Two capacitors R₁ = 4$\mathrm{\Omega }$ and R₂ = 5$\mathrm{\Omega }$ are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is Options:
  A) 4 : 5
  B) 5 : 4
  C) 16 : 25
  D) 25 : 16
  Show Answer
  The correct answer is B .
• Question 166: The property of the eye known as its power of accommodation is controlled by the Options:
  A) pupil
  B) virteous humour
  C) iris
  D) ciliary muscles
  Show Answer
  The correct answer is D .
• Question 167: A planet has mass m₁ and is at a distance r, from the sun. A second planet has mass m₂ = 10m₁ and at a distance of r₂ = 2r₁ from the sun. Determine the ratio of the gravitational force experienced by the planets. Options:
  A) 1 : 5
  B) 2 : 5
  C) 3 : 5
  D) 4 : 5
  Show Answer
  The correct answer is B .
• Question 168: From the generating station to each substation power is transmitted at a very high voltage so as to reduce Options:
  A) hysteresis loss
  B) eddy current loss
  C) magnetic flux leakage
  D) heating in the cells
  Show Answer
  The correct answer is B .
• Question 169:

  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 B .
• Question 170:

  A string is sustaining a stationary wave when

  Options:
  A) the frequency of the wave is not proportional to the wavelength of the wave
  B) the amplitude of vibration is always zero
  C) two equal waves are travelling in opposite directions
  D) the waves are longitudinal
  E) the frequency is directly proportional to the length of the string
  Show Answer
  The correct answer is C .