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 1381: An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is Options:
  A) 80.0W
  B) 40.0W
  C) 10.0W
  D) 0.1W
  Show Answer
  The correct answer is A .
• Question 1382: A beam of light is incident from air to water at an angle of 30^oC. Find the angle of refraction if the refractive index of water is $\frac{4}{3}$ Options:
  A) 15^oC
  B) 18^oC
  C) 22^oC
  D) 24^oC
  Show Answer
  The correct answer is C .
• Question 1383: When temperature of a liquid increases, its surface tension Options:
  A) Decreases
  B) Increases
  C) Remain Constant
  D) Increases then decreases
  Show Answer
  The correct answer is A .
• Question 1384: The vacuum in a thermos flask helps to reduce heat transfer by? Options:
  A) convection and radiation
  B) convection and conduction
  C) conduction and radiation
  D) radiation only
  Show Answer
  The correct answer is B .
• Question 1385: The hatch door of a submarine has an area of 0.5m². The specific gravity of sea water is 1.03. Assume that g = 10ms^-1,and neglect the atmospheric pressure. The force exerted by the sea water on the hatch door at a depth of 200m is Options:
  A) 1.03 x 10⁵N
  B) 1.03 x 10⁴Nm^-2
  C) 1.06 x 10⁵Nm^-2
  D) 2.06 x 10⁶N
  E) 1.03 x 10³N
  Show Answer
  The correct answer is E .
• Question 1386:

  I. Coherence

  II. Same frequency

  III. Same wavelength

  IV. Same IntensityWhich of the conditions above are necessary to produce interference fringes?

  Options:
  A) I and III
  B) I, II and IV
  C) I, II and III
  D) II and III
  Show Answer
  The correct answer is C .
• Question 1387:

  

  The figure above shows a uniform wood of weight 200N and length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. Calculate the tension in the cord if the wood is horizontal.

  Options:
  A) 10N
  B) 20N
  C) 100N
  D) 200N
  Show Answer
  The correct answer is D .
• Question 1388:

  A tuning fork having a frequency of 312 Hz emits a wave which has a wavelength of 1.10 m. Calculate the velocity of sound

  Options:
  A) 312.0 ms${}^{-1}$
  B) 110.0 ms${}^{-1}$
  C) 343.2 ms${}^{-1}$
  D) 686.4 ms${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 1389:

  

  In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

  Options:
  A) 40N
  B) 80N
  C) 120N
  D) 200N
  Show Answer
  The correct answer is B .
• Question 1390:

  The limiting frictional force between two surface depends on

  I. the normal reaction between the surfaces

  II. the area of surface in contact

  III. the relative velocity between the surfaces

  IV. the nature of the surface

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