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 81:

  If the stress on a wire is 10${}^7$NM${}^{-2}$ and the wire is stretched from its original length of 10.00m to 10.05m. The young'smodulus of the wire is?

  Options:
  A) 5.0 x 10${}^{-4}$Nm${}^{-2}$
  B) 5.0 x 10${}^{-5}$Nm${}^{-2}$
  C) 2.0 x 10${}^{-8}$Nm${}^{-2}$
  D) 2.0 x 10${}^9$Nm${}^{-2}$
  Show Answer
  The correct answer is D .
• Question 82: A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second? Options:
  A) 81.00kg
  B) 9.00kg
  C) 0.90kg
  D) 0.09kg
  Show Answer
  The correct answer is C .
• Question 83: 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 84:

  

  The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is

  Options:
  A) 4V
  B) 12V
  C) 2V
  D) 6V
  Show Answer
  The correct answer is C .
• Question 85: 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 86:

  

  The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W.

  Options:
  A) 13.3N
  B) 20.0N
  C) 40.0N
  D) 80.0N
  Show Answer
  The correct answer is C .
• Question 87: A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring? Options:
  A) 3750J
  B) 2500J
  C) 3.75J
  D) 2.50J
  Show Answer
  The correct answer is C .
• Question 88:

  If in a simple pendulum experiment the length of the inextensible string is increased by a factor offour, its period is increased by a factor of?

  Options:
  A) 4
  B) $\frac{\pi }{2}$
  C) $\frac{1}{4}$
  D) 2
  Show Answer
  The correct answer is D .
• Question 89:

  A sonometer wire is vibrating at frequency f_o. If the tension in the wire is doubted while the length and the mass per unit length are kept constant, the new frequency of vibration is

  Options:
  A) ^f_o/₂
  B) 2f_o
  C) ^f_o/_√2
  D) f_o√2
  Show Answer
  The correct answer is D .
• Question 90: A structural engineer stood on a top of a building releasing a light and heavy object to the ground which of the following statement is true?(Neglect Air Resistance) Options:
  A) Bothe light and heavy subject reach the ground at the same time
  B) he light object get to the ground first before the heavy object
  C) he heavy object to the ground first before the light object
  D) None get to the ground first
  Show Answer
  The correct answer is A .