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 431: The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because Options:
  A) atmospheric pressure acts on the surface of the lake
  B) pressure increases with depth
  C) density remains constant with pressure
  D) the bubble experiences an upthrust
  Show Answer
  The correct answer is B .
• Question 432: What precaution should a manufacturer take to ensure that energy loss in a transformer is minimized? Options:
  A) the winding of the transformer should be made of high resistance wire
  B) the core should be made of thin sheets of metal
  C) no magnetic material should be used to make the core
  D) the flux linking the primary with the secondary coils should be minimum
  Show Answer
  The correct answer is B .
• Question 433: The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear, the slope of this graph is a measure of Options:
  A) initial displacement
  B) initial velocity
  C) acceleration
  D) half the acceleration
  E) half the initial velocity
  Show Answer
  The correct answer is C .
• Question 434: the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is Options:
  A) 3
  B) 1.5
  C) 1.32
  D) 1
  E) 0.67
  Show Answer
  The correct answer is E .
• Question 435: The energy contained in a wire when it extended by 0.02m by a force 500 N is Options:
  A) 5J
  B) 10J
  C) 10³J
  D) 10⁴
  Show Answer
  The correct answer is A .
• Question 436:

  The following are some units

  I. Ns

  II. Non

  III. Nm${}^{-2}$

  IV. J°K${}^{-1}$

  V. JKj${}^{-1}$

  What are the units of latent heat?

  Options:
  A) I
  B) II
  C) III
  D) V
  Show Answer
  The correct answer is D .
• Question 437: A trough 12.0cm deep is filled with water of refractive index $\frac{4}{3}$. By how much would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface? Options:
  A) 3.0cm
  B) 6.0cm
  C) 9.0cm
  D) 16.0cm
  Show Answer
  The correct answer is A .
• Question 438:

  Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

  Options:
  A) 230$\pi$
  B) 23$\pi$
  C) 70$\pi$
  D) 140$\pi$
  Show Answer
  The correct answer is A .
• Question 439:

  If the frequency of an emitted x-ray is 1.6 x 10¹⁶Hz, the accelerating potential is?

  [e = 1.6 x 10^-19C, h = 6.63 x 10^-34Js]

  Options:
  A) 6630.0V
  B) 663.0V
  C) 66.3V
  D) 6.6V
  Show Answer
  The correct answer is C .
• Question 440:

  Cathode rays are

  Options:
  A) High-energy electromagnetic waves
  B) protons
  C) neutrons
  D) streams of electrons
  Show Answer
  The correct answer is D .