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 281: The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is Options:
  A) 9.0 x 10^-3J
  B) 9.0 x 10^-2J
  C) 1.4 x 10^-2J
  D) 1.8 x 10^-3J
  Show Answer
  The correct answer is B .
• Question 282: The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because Options:
  A) the wavelength of sound becomes greater in the bottle
  B) sound cannot pass through the bottle
  C) sound needs a material medium
  D) sound can pass through a vacuum
  Show Answer
  The correct answer is C .
• Question 283: A motor vehicle is brought to rest from a speed of 15ms^-1 in 20 seconds. Calculate the retardation. Options:
  A) 0.75ms^-1
  B) 1.33ms^-2
  C) 5.00ms^-2
  D) 7.50ms^-2
  Show Answer
  The correct answer is A .
• Question 284:

  A sonometer wire is vibrating at frequency f_o. If the tension in the wire is doubted while the length and the mass per unit length are kept constant, the new frequency of vibration is

  Options:
  A) ^f_o/₂
  B) 2f_o
  C) ^f_o/_√2
  D) f_o√2
  Show Answer
  The correct answer is D .
• Question 285:

  The potential energy in an elastic string of force constant k, which has an extension X is?

  Options:
  A) kX
  B) KX${}^2$
  C) ½KX${}^2$
  D) ½K
  Show Answer
  The correct answer is C .
• Question 286:

  I. Mass

  II. Density

  III. Temperature

  IV. Nature of substance

  Which of the above affect diffusion?

  Options:
  A) I and II only
  B) I,II and IV only
  C) II, III and IV only
  D) I, II, III and IV
  Show Answer
  The correct answer is B .
• Question 287:

  A lead bullet of mass 0.05kg is fired with a velocity of 200ms${}^{-1}$ into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?

  Options:
  A) 50J
  B) 100J
  C) 150J
  D) 200J
  Show Answer
  The correct answer is A .
• Question 288:

  A certain radioactive source emits radiation that was found to be deflected by both magneticand electric fields. The radiation is?

  Options:
  A) beta rays
  B) gamma rays
  C) x-rays
  D) ultra-violet rays
  Show Answer
  The correct answer is A .
• Question 289: To convert an alternating current dynamo into a direct current dynamo, the Options:
  A) number of turns in the coil is increased
  B) strength of the field magnet is increased
  C) slip rings are replaced with a split ring commutator
  D) coil is wound on a soft iron armature
  Show Answer
  The correct answer is C .
• Question 290: The small droplet of water that forms on the grass in the early hours of the morning is Options:
  A) hail
  B) dew
  C) fog
  D) mist
  Show Answer
  The correct answer is B .