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 1231: A bar of initial length /₀ is heated through a temperature change $\mathrm{\Delta }$t to a new length I. The linear expansivity, a, of the bar is Options:
  A) $\frac{/-{/}_o}{/\mathrm{\Delta }t}$
  B) $\frac{/-{/}_o}{{/}_o\mathrm{\Delta }t}$
  C) /_o(1 + $\mathrm{\Delta }$ t)
  D) $\frac{/-{/}_o}{/(1+\mathrm{\Delta }t)}$
  Show Answer
  The correct answer is B .
• Question 1232: A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is Options:
  A) $\frac{N}{8}$
  B) $\frac{3N}{8}$
  C) $\frac{5N}{8}$
  D) $\frac{7N}{8}$
  Show Answer
  The correct answer is A .
• Question 1233: When the length I of a piece of wire under constant tension is varied, the relationship of the frequency of the vibration f$\alpha$/ is Options:
  A) f$\alpha$/
  B) f$\alpha \frac{1}{I^2}$
  C) f $\alpha \sqrt{I}$
  D) f$\alpha \frac{1}{1}$
  Show Answer
  The correct answer is D .
• Question 1234: A series RLC circuit is said to resonate, when Options:
  A) capacitive reactance is zero
  B) conductance is maximum
  C) current is minimum
  D) impedance is minimum
  E) inductive reactance is zero
  Show Answer
  The correct answer is D .
• Question 1235: An immersion heater is rated 1500W. How long does it take the heater to raise the temperature of 1 kg of water by 30°C? (Assume heat lost to the surrounding is negligible, Specific heat capacity of water 4200Jkg^-1K^-1) Options:
  A) 84s
  B) 112s
  C) 130s
  D) 168s
  E) 280s
  Show Answer
  The correct answer is A .
• Question 1236:

  Consider the wave equation y = 5mm sin [1cm${}^{-1}$x - 60s${}^{-1}$t]. The wave number is?

  Options:
  A) 0.1 cm${}^{-1}$
  B) 10cm${}^{-1}$
  C) 1.0cm${}^{-1}$
  D) 2cm${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 1237: The effect of a particle in a fluid attaining its terminal velocity is that the Options:
  A) acceleration is maximum
  B) weight is equal to the retarding force
  C) buoyancy force is equal to the to the viscous retardind force
  D) buoyancy force is more than the weight of the fluid displaced
  Show Answer
  The correct answer is B .
• Question 1238: A radioactive isotope has a decay constant of 10^-5s⁴. Calculate half life Options:
  A) 6.93 x 10⁵s
  B) 6.93 x 10⁵s
  C) 6.93 x10⁴s
  D) 6.93 x 10⁴s
  Show Answer
  The correct answer is C .
• Question 1239:

  

  A uniform bean HK of length 10m and weighing 200N is supported at both ends as shown above. A man weighing 1000N stands at a point P on the beam. If the reactions at point H an K respectively are 800N and 400N, Then the distance HP is

  Options:
  A) 4m
  B) 3.5m
  C) 3m
  D) $6\frac{2}{3}$m
  E) 7m
  Show Answer
  The correct answer is C .
• Question 1240:

  Which of the following is consistent with Charles' law?

  I. 

  II. 

  III. 

  IV. 

  Options:
  A) I
  B) II
  C) III
  D) IV
  Show Answer
  The correct answer is A .