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 1661: The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by Options:
  A) convection
  B) conduction
  C) radiation
  D) evaporation
  Show Answer
  The correct answer is A .
• Question 1662: Induced emfs are best explained using Options:
  A) Ohm's law
  B) Faraday's law
  C) Colomb's law
  D) Lenz's law
  Show Answer
  The correct answer is D .
• Question 1663: 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 .
• Question 1664: a tap supplies water at 26^oC while another supplies water at 82^oC. If a man wishes to bathe with water at 40^oC the ratio of hot mass of hot water to that of cold water required is Options:
  A) 1:3
  B) 3:1
  C) 3:7
  D) 7:3
  E) 15:8
  Show Answer
  The correct answer is A .
• Question 1665:
  

  A block of mass 0.5 kg is suspended at the 40 cm mark of a light metre rule AB that is pivoted at point E, the 90 cm mark, and is kept at equilibrium by a string attached at point D, the 60 cm mark, as shown in the figure above. Find the tension T in the string.

  [Take g = $10ms-2$ ]

  Options:
  A) 16.67N
  B) 15.67N
  C) 14.67N
  D) 18.67N
  Show Answer
  The correct answer is A .
• Question 1666: The normal temperature of human body is record at what ranges? Options:
  A) 27°C to 43°C
  B) 30°C to 40°
  C) 98.4°C only
  D) Between 35°C to 37°C
  Show Answer
  The correct answer is D .
• Question 1667: The equation P^xV^yT^z = constant Options:
  A) x = 0, y = 0, z = 1
  B) x = 1, y = 0, z = 0
  C) x = 1, y = 1, z = 0
  D) x = 1, y = 1, z = 1
  E) x = 1, y = 1, z = -1
  Show Answer
  The correct answer is E .
• Question 1668: On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current Options:
  A) i only
  B) ii only
  C) iii only
  D) ii and iii only
  E) i,ii and iii
  Show Answer
  The correct answer is B .
• Question 1669: A bullet fired vertically from upward from a gun held 2.0 m above the ground reaches its maximum height in 4.0s. calculate its initial velocity.
  [g = 10ms^-2] Options:
  A) 10 ms^-1
  B) 8 ms^-1
  C) 40 ms^-1
  D) 20 ms^-1
  Show Answer
  The correct answer is C .
• Question 1670: A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2] Options:
  A) 1000 N
  B) 700 N
  C) 110 N
  D) 10 N
  Show Answer
  The correct answer is D .