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 1541: When the volume of a given mass of gas is halved and its temperature doubled, the pressure Options:
  A) remains constant
  B) increases by a factor of 4
  C) increases by a factor of 3
  D) decreases by a factor of 4
  Show Answer
  The correct answer is B .
• Question 1542: The action of blotting paper on ink is due to Options:
  A) diffusion
  B) osmosis
  C) capillarity
  D) surface tension
  Show Answer
  The correct answer is C .
• Question 1543:

  The pitch of an acoustic device can be increased by

  Options:
  A) decreasing the loudness
  B) increasing the intensity
  C) increasing the frequency
  D) decreasing the intensity
  Show Answer
  The correct answer is C .
• Question 1544:

  If the frequency of an emitted x-ray is 1.6 x 10${}^{16}$Hz, the accelerating potential is?

  [e = 1.6 x 10${}^{-19}$J, h = 6.63 x 10-${}^{34}$Js]

  Options:
  A) 6630.0V
  B) 663.0V
  C) 66.3V
  D) 6.6V
  Show Answer
  The correct answer is C .
• Question 1545:

  A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

  Options:
  A) 1.25 x 10${}^4$W
  B) 2.50x 10${}^4$W
  C) 1.25 x 10${}^6$W
  D) 2.50 x 10${}^6$W
  Show Answer
  The correct answer is A .
• Question 1546: Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0^oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that $\frac{Vx}{Vy}$ = 2 and $\frac{\theta x}{\theta y}$ = $\frac{1}{2}$ the ratio of the heat flow into the flask is Options:
  A) $\frac{1}{4}$
  B) $\frac{1}{2}$
  C) 4
  D) 1
  E) 2
  Show Answer
  The correct answer is D .
• Question 1547: Eight alpha decays and six beta decays are necessary before an atom of 2 ${}_{92}^{238}U$ achieves stability. The final product in the chain has an atomic number of Options:
  A) 70
  B) 78
  C) 82
  D) 90
  Show Answer
  The correct answer is C .
• Question 1548: A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is Options:
  A) 90%
  B) 80%
  C) 85%
  D) 87%
  Show Answer
  The correct answer is B .
• Question 1549:

  A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms${}^{-1}$. The recoil speed of the machine gun is

  Options:
  A) 0.5 ms${}^{-1}$
  B) 1.5 ms${}^{-1}$
  C) 1 ms${}^{-1}$
  D) 2ms${}^{-}1$
  Show Answer
  The correct answer is C .
• Question 1550: Efficiency of a transformer is equal to Options:
  A) Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
  B) Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
  C) Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
  D) Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
  Show Answer
  The correct answer is D .