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 1371: A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms^-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is(take g = 10ms^-2) Options:
  A) 5 J
  B) 10 J
  C) 15 J
  D) 20 J
  Show Answer
  The correct answer is C .
• Question 1372: A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value Options:
  A) 100Ω
  B) 200Ω
  C) 300Ω
  D) 500Ω
  Show Answer
  The correct answer is B .
• Question 1373:

  The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .
• Question 1374: An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
  [specific heat capacity of water = 4.2 x 10³ jkg^-1 k^-1] Options:
  A) 1.05 x 10³s
  B) 1.05 x 10⁵s
  C) 1.05 x 10²s
  D) 1.05 x 10⁴s
  Show Answer
  The correct answer is A .
• Question 1375:

  Which process is responsible for production of energy in stars?

  Options:
  A) Nuclear reaction
  B) Nuclear fission
  C) Nuclear fusion
  D) Radioactive decay
  Show Answer
  The correct answer is C .
• Question 1376: 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 1377: The velocity of a sound wave at 27^oC is 360ms^-1. Its velocity at 127^oC is Options:
  A) 120√3 ms^-1
  B) 240 ms^-1
  C) 240√3 ms^-1
  D) 720√3 ms^-1
  Show Answer
  The correct answer is C .
• Question 1378:

  Cathode rays are

  Options:
  A) High-energy electromagnetic waves
  B) protons
  C) neutrons
  D) streams of electrons
  Show Answer
  The correct answer is D .
• Question 1379: 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 1380: The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days? Options:
  A) $\frac{1}{16}$
  B) $\frac{1}{4}$
  C) $\frac{1}{2}$
  D) $\frac{15}{16}$
  Show Answer
  The correct answer is D .