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 151:

  

  The fig above represents the main sequence of energy conversion at Kainji dam. What is the efficiency of the system?

  Options:
  A) Q1/Q2
  B) E/Q1
  C) E/(Q1-Q2)
  D) E/(Q1-Q2)
  Show Answer
  The correct answer is B .
• Question 152:

  A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms${}^{-1}$, how far is he from the cliff?

  Options:
  A) 680m
  B) 170m
  C) 34m
  D) 85m
  Show Answer
  The correct answer is D .
• Question 153:

  If in a simple pendulum experiment the length of the inextensible string is increased by a factor offour, its period is increased by a factor of?

  Options:
  A) 4
  B) $\frac{\pi }{2}$
  C) $\frac{1}{4}$
  D) 2
  Show Answer
  The correct answer is D .
• Question 154: The number of neutrons contained in the nucleus ${}_{92}^{238}U$ is Options:
  A) 92
  B) 146
  C) 238
  D) 330
  Show Answer
  The correct answer is B .
• Question 155: A gas would serve as an electrical conductor under Options:
  A) reduced pressure and high current
  B) increased magnetic field
  C) reduced pressure and reduced potential
  D) exposure to visible light
  Show Answer
  The correct answer is A .
• Question 156:

  

  The figure above shows displacement-time graphs for three different motions. which of the following statements is correct

  Options:
  A) graph 2 corresponds to the highest velocity
  B) graph 1 corresponds to zero gravity
  C) graph 3 corresponds to a particle moving in the negative x direction
  D) graph 2 corresponds to a particle moving in the positive x direction
  Show Answer
  The correct answer is D .
• Question 157:

  

  In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P₁ and P₂ dissipated by R₁ and R₂

  Options:
  A) ^R₂/_R1
  B) ^R₁/_R2
  C) ^R₁+R₂/_R1
  D) ^R₁+R₂/_R2
  Show Answer
  The correct answer is A .
• Question 158: When ${}_{82}^{210}Pb$ decays to ${}_{80}^{206}Pb$, it emits Options:
  A) two alpha and two beta particles
  B) an alpha particle
  C) one beta particle
  D) one alpha and one beta particle
  Show Answer
  The correct answer is B .
• Question 159: An organic pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340ms^-1 Options:
  A) 106Hz
  B) 213Hz
  C) 318Hz
  D) 425Hz
  Show Answer
  The correct answer is A .
• Question 160:

  Rainbow formation is as a result of the combination of which of the following phenomena?
  (i) Reflection
  (ii) Dispersion
  (iii) Total internal reflection
  (iv) Refraction

  Options:
  A) (ii) and (iv) only
  B) (i), (iii) and (iv) only
  C) (ii), (iii) and (iv) only
  D) (i), (ii) and (iv) only
  Show Answer
  The correct answer is C .