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 231: A radioactive source emits X–rays of very short wavelength (10 ^-13m ) what is the frequently of these rays? Options:
  A) 2 × 10¹⁸HZ
  B) 3 × 10 ¹⁹HZ
  C) 3 × 10²¹HZ
  D) 3 × 10^-19HZ
  Show Answer
  The correct answer is C .
• Question 232: If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes Options:
  A) inductance
  B) eddy currents
  C) elecro-magnetism
  D) dipole moment
  Show Answer
  The correct answer is B .
• Question 233: In a purely inductive circuit, the current Options:
  A) lags behind the voltage in phase by 90^o
  B) leads the voltage in phase by 90^o
  C) is in the same phase with the voltage
  D) leads the voltage by 180^o
  Show Answer
  The correct answer is A .
• Question 234: If the pressure of the vapour on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed? Options:
  A) room temperature
  B) boiling point
  C) freezing point
  D) standard temperature
  Show Answer
  The correct answer is B .
• Question 235: A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the Options:
  A) 80%
  B) 75%
  C) 50%
  D) 33%
  Show Answer
  The correct answer is B .
• Question 236: A stone is thrown with a speed of 10ms at an angle of 30° to the horizontal, Calculate its time of flight, (g = 10ms²) Options:
  A) 0.5s
  B) 1.0s
  C) 1.7s
  D) 2.0s
  E) 3.4s
  Show Answer
  The correct answer is B .
• Question 237: When a current of 1 .0A flows in an electrolyte for 3.0h, a mass of 1 .0g is deposited. What mass will be deposited in 10.0h if a current of 3.0A flows through the electrolyte? Options:
  A) 30.0g
  B) 24.0g
  C) 10.0g
  D) 6.0g
  E) 0.4g
  Show Answer
  The correct answer is B .
• Question 238: The colours seen on soap bubbles are due to Options:
  A) Diffraction
  B) Refraction
  C) Dispersion
  D) Interference
  Show Answer
  The correct answer is D .
• Question 239: A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary? Options:
  A) 232
  B) 450
  C) 550
  D) 2750
  E) 11000
  Show Answer
  The correct answer is D .
• Question 240: If negative charges are induced on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will Options:
  A) close up
  B) become positively charged
  C) become negatively charged
  D) open further
  Show Answer
  The correct answer is A .