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 811: An electric iron is rated 1000W, 230V. What is the resistance of its elements? Options:
  A) 51.9Ω
  B) 52.9Ω
  C) 55.9Ω
  D) 57.6Ω
  Show Answer
  The correct answer is B .
• Question 812: The magnitude of the resultant of two mutually perpendicular forces, F₁ and F₂ is 13N, if the magnitude of F₁ is 5N, what is the magnitude of F₂? Options:
  A) 2.6N
  B) 6.0N
  C) 12.0N
  D) 18.0N
  Show Answer
  The correct answer is C .
• Question 813: The latent heat of fusion of ice is 80cal g^-1. How much heat is required to change 10g of ice at Q^oC into water at the same temperature? Options:
  A) 80 cal
  B) 10 cal
  C) 8 cal
  D) 800 cal
  E) 400 cal
  Show Answer
  The correct answer is D .
• Question 814: The purpose of a dielectric material in a parallel plate capacitor is to Options:
  A) increase its capacitance
  B) decrease its capacitance
  C) insulate the plate from each other
  D) increase the magnetic field between the plates
  Show Answer
  The correct answer is C .
• Question 815: A waterfall is 1.260m high. Calculate the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall. (Neglect heat losses to the surroundings, take g as 10m^-2 and specific heat capacity of water as 4200Jkg^-1K^-1) Options:
  A) 0.3^oC
  B) 3.0^oC
  C) 33.3^oC
  D) 42.0^oC
  E) 100.0^oC
  Show Answer
  The correct answer is B .
• Question 816: A parallel plate capacitor has a common plate area of 5 x 10^-8m² and plate separation of 2 x 10³m, Assuming free space, What is the capacitance? [$\epsilon$_o = 9.0 X 10^-12C²N^-1m^-2] Options:
  A) 2.25 x 10^-17F
  B) 4.50 x 10^-17F
  C) 2.25 x 10^-16F
  D) 4.50 x 10^-16F
  Show Answer
  The correct answer is C .
• Question 817: A radioisotope has a decay constant of 10^-7s^-1. The average life of the radioisotope is Options:
  A) 1.00 x 10⁷s
  B) 6.93 x 10⁸s
  C) 1.00 x 10^-7s
  D) 6.93 x 10⁷s
  Show Answer
  The correct answer is B .
• Question 818: The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth? Options:
  A) 1.92N
  B) 2.88N
  C) 6.72N
  D) 8.00N
  E) 12.00N
  Show Answer
  The correct answer is E .
• Question 819: The phenomenon where by the water droplets in the atmosphere combines with dust particles in the air to reduce visibility is Options:
  A) cloud
  B) mist
  C) hail
  D) fog
  Show Answer
  The correct answer is D .
• Question 820: A 3m³ volume of liquid W of density 200kgm³ is mixed with another liquid L of volume 7m³ and density 150kgm^-3. the density of mixture is? Options:
  A) 165kgm^-3
  B) 100kgm^-3
  C) 265kgm^-3
  D) 350kgm^-3
  Show Answer
  The correct answer is A .