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 981: The equation P^xV^yT^z = constant in charles' law when Options:
  A) x = 1, y = -1, z = 1
  B) x = 0, y = 1, z = -1
  C) x = 1, y = 0, z = -1
  D) x = 0, y = 1, z = 1
  Show Answer
  The correct answer is B .
• Question 982: A dynamo primarily combines Options:
  A) mechanical energy into electrical energy
  B) electrical energy into kinetic energy
  C) potential energy into kinetic energy
  D) kinetic energy into potential energy
  Show Answer
  The correct answer is A .
• Question 983: An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater. Options:
  A) 0.25 W
  B) 4.00 W
  C) 38.40W
  D) 60.00W
  Show Answer
  The correct answer is D .
• Question 984: The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave Options:
  A) 0.5 ms^-1
  B) 1.0 ms^-1
  C) 2.0ms^-1
  D) 3.0ms^-1
  E) 4.0ms^-1
  Show Answer
  The correct answer is C .
• Question 985: The velocity ratio of an inclined plane where angle of inclination in θ is Options:
  A) Sinθ
  B) Cosθ
  C) Tanθ
  D) $\frac{1}{\sin \theta }$
  Show Answer
  The correct answer is D .
• Question 986: Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg^-1 . Specific heat capacity of water 4.2Jg^-1 K^-1] Options:
  A) 840J
  B) 3360J
  C) 3420J
  D) 4200J
  E) 7560J
  Show Answer
  The correct answer is E .
• Question 987: What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V? Options:
  A) 2.0 × 10^-4J
  B) 8.0 ×10^-4J
  C) 4.0 × 10^-3J
  D) 8.0 × 10^-3J
  E) 1.6 × 10^-2J
  Show Answer
  The correct answer is D .
• Question 988: The process through which free electrons leave the surface of hot metal is known as? Options:
  A) photon emission
  B) photo emission
  C) thermionic emission
  D) electron emission
  Show Answer
  The correct answer is C .
• Question 989: When a sound wave passes from air into water its Options:
  A) speed and frequency increases but its wavelength remains the same
  B) speed and wavelength increases but its frequency remains the same
  C) speed decreases
  D) speed remains the same but its frequency and wavelength change
  E) speed increases but its frequency and wavelength decreases
  Show Answer
  The correct answer is C .
• Question 990: To produce an enlarged and erect image with a concave mirror,the object must be positioned Options:
  A) at the principal focus
  B) beyond the centre of curvature
  C) between the principal focus and the centre of the curvature
  D) between the principal focus and the pole
  Show Answer
  The correct answer is D .