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 101: A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is Options:
  A) $\frac{N}{8}$
  B) $\frac{3N}{8}$
  C) $\frac{5N}{8}$
  D) $\frac{7N}{8}$
  Show Answer
  The correct answer is A .
• Question 102: A force of 15N stretches a spring to a total length of 30cm. An additional force of 10N stretches the spring 5cm further. Find the natural length of the spring Options:
  A) 25.0cm
  B) 22.5cm
  C) 20.0cm
  D) 15.0cm
  Show Answer
  The correct answer is B .
• Question 103: One of the most important applications of bi-metallic strip is found in the construction of Options:
  A) a thermostat
  B) an altimeter
  C) a thermocouple
  D) a hydrometer
  Show Answer
  The correct answer is A .
• Question 104: In a projection lantern of focal length f, the object distance u, is such that Options:
  A) u > 2f > f
  B) u < f < 2f
  C) u = f < 2f
  D) f < u < 2f
  Show Answer
  The correct answer is D .
• Question 105: At 35°C and 5 atmospheres pressure the density of a gas is 0. 600g per liter. What is the density at 7 atmospheric pressure and 350°C. Options:
  A) 0.27g / liters
  B) 0.25g / liters
  C) 17g / liters
  D) 0.15g / liters
  Show Answer
  The correct answer is C .
• Question 106:

  The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?

  Options:
  A) concave mirror of focal length 5cm
  B) concave mirror of focal length 10cm
  C) convex mirror of focal length 5cm
  D) convex mirror of focal length 10cm
  Show Answer
  The correct answer is C .
• Question 107: A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms^-1 to 40ms^-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms^-1] Options:
  A) 15N
  B) 20N
  C) 35N
  D) 45N
  Show Answer
  The correct answer is C .
• Question 108: At a fixed point below a liquid surface, the pressure downwards is P₁ and pressure upwards is P₂. It can be deduced that Options:
  A) P₁ > P₂
  B) P₁ ≥ P₂
  C) P₁< P₂
  D) P₁ = P₂
  Show Answer
  The correct answer is A .
• Question 109:

  According to kinetic molecular model in gases,

  Options:
  A) the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern
  B) the particles vibrate about fixed positions and are held together by the strong intermolecular bonds between them
  C) the molecules are very far apart and occupy all the spaces made available to them
  D) the particles occur in clusters with molecules slightly further apart
  Show Answer
  The correct answer is C .
• Question 110: If a metal wire 4m long and cross-sectional area 0.8 mm² has a resistance of 60, find the resistivity of the wire Options:
  A) 5.3x10^-7
  B) 3.0x10^-5
  C) 1.2x10^-6
  D) 3.2x10^-6
  Show Answer
  The correct answer is C .