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 681: Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp? Options:
  A) heat $\to$ light $\to$ sound $\to$ kinetic
  B) kinetic $\to$ light $\to$ heat $\to$ electricity
  C) heat $\to$ kinetic$\to$ electricity $\to$ heat $\to$ light
  D) electricity $\to$ kinetic $\to$ heat v light
  E) heat $\to$ sound $\to$ kninetic v electricity
  Show Answer
  The correct answer is C .
• Question 682: In a discharge tube, most of the gas is pumped out so that electricity is conducted at Options:
  A) low voltage
  B) steady voltage
  C) high pressure
  D) low pressure
  Show Answer
  The correct answer is D .
• Question 683: An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms^-2) Options:
  A) 3.0s
  B) 4.5s
  C) 6.0s
  D) 7.5s
  E) 9.0s
  Show Answer
  The correct answer is A .
• Question 684: A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object? Options:
  A) 12cm
  B) 24cm
  C) 48cm
  D) 108cm
  Show Answer
  The correct answer is B .
• Question 685: The driver in a motor car, of which the total mass is 800kg and which is traveling at 20ms^-1, suddenly observes a stationary dog in his path 50m ahead. If the car brakes can exert a force of 2000N, what will most likely happen? Options:
  A) the car will be able to stop immediately the driver notices the dog
  B) the car will stop 3pm after hitting the dog
  C) the car will stop 20m in front of the dog
  D) the driver will quickly reverse the car
  E) the car will stop 5m beyound the dog
  Show Answer
  The correct answer is C .
• Question 686:

  

  In the diagram given the hanging mass m₂ is adjusted until m₁ is on the verge of sliding. The coefficient of static

  Options:
  A) $\frac{m_1}{m_2}$
  B) $\frac{m_{1}g}{m_2}$
  C) $\frac{m_2}{m_1}$
  D) $\frac{m_{2}g}{m_1}$
  Show Answer
  The correct answer is C .
• Question 687: Which of the following is true of sounds? Options:
  A) sound travels faster in air at 20^oC than at 30^oC
  B) the frequency of a given sound wave changes when it crosses the boundary seperating two media
  C) the wavelength of a given sound wave in air decreases as the temperature increases
  D) sound waves cannot be reflected
  Show Answer
  The correct answer is C .
• Question 688: If an object is placed in front of two mirrors inclined at 90^o, how many images will be formed? Options:
  A) five
  B) four
  C) three
  D) two
  Show Answer
  The correct answer is C .
• Question 689:

  

  The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

  Options:
  A) S-S poles
  B) S-N poles
  C) N-S poles
  D) N-N poles
  Show Answer
  The correct answer is A .
• Question 690: A length of wire has a frequency of 255Hz when stretched by a force of b225N. If the fore increased to 324N, what is the new frequency of vibration Options:
  A) 306 Hz
  B) 512 Hz
  C) 488 Hz
  D) 356 Hz
  Show Answer
  The correct answer is A .