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 2431: The core of an efficient transformer should consist of laminated pieces of metal in order to Options:
  A) increase the heat produced by increasing the eddy current
  B) increase the heat produced by reducing the eddy current
  C) reduce the heat produced by increasing the eddy current
  D) reduce the heat produced by reducing the eddy current
  Show Answer
  The correct answer is D .
• Question 2432: The electrochemical equivalent of a metal is 0.126 x 10^-6 kgC^-1. The mass of the metal that a current of 5A will deposit from a suitable bath in 1 hour is Options:
  A) 0.0378 x 10 ^-3kg
  B) 0.227 x 10 ^-3kg
  C) 0.378 x 10 ^-3kg
  D) 0.595 x 10 ^-3kg
  E) 2.268 x 10 ^-3kg
  Show Answer
  The correct answer is E .
• Question 2433:

  A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?

  Options:
  A) 47 g
  B) 52.8 g
  C) 37.6 g
  D) 56.6 g
  Show Answer
  The correct answer is D .
• Question 2434: An inclined plane which makes an angle of 30^o with the horizontal has a velocity ratio of Options:
  A) 2
  B) 1
  C) 0.866
  D) 0.50
  Show Answer
  The correct answer is A .
• Question 2435: A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level? Options:
  A) $\frac{1}{6}$
  B) $\frac{1}{5}$
  C) $\frac{1}{3}$
  D) $\frac{4}{5}$
  E) $\frac{5}{6}$
  Show Answer
  The correct answer is E .
• Question 2436: How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC? Options:
  A) 39 . 98 x 10^-1J
  B) 9.75 x 10²J
  C) 3.98 x 10³J
  D) 9.75 x 10³J
  Show Answer
  The correct answer is B .
• Question 2437: In the diagram above, X and Y have resistances 6 and 4 ohms respectively, if the power dissipation in X is 10W then power dissipation in Y is Options:
  A) 2.4W
  B) 4
  C) 6.0W
  D) 6.7W
  E) 15.0W
  Show Answer
  The correct answer is D .
• Question 2438: Calculate the amount of heat required to convert 2kg of ice at 2^oC to water at 0^oC. [specific heat capacity of ice = 2090Jkg^-1oC^-1, specific latent heat of fusion of ice = 333kJkg^-1] Options:
  A) 666J
  B) 8360J
  C) 666 000J
  D) 674 360J
  Show Answer
  The correct answer is D .
• Question 2439: The specific latent heat of fusion of lead is the amount of heat required to Options:
  A) melt lead at its melting point
  B) heat a unit mass of lead through 1^oC
  C) change the state of a unit mass of lead at its melting point
  D) change the state of a unit mass of lead at its boiling point
  Show Answer
  The correct answer is C .
• Question 2440: An object is weighted at different locations on the earth. What will be the right observation? Options:
  A) Both the mass and weight are constant
  B) Both the mass and weight vary
  C) the mass is constant while the weight varies
  D) the weight is constant while the mass varies
  Show Answer
  The correct answer is C .