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 21:

  A source of sound produces waves in air of wavelength1.65m. If the speed of soundin air is 330ms${}^{-1}$, the period of vibration in air is?

  Options:
  A) 200
  B) 0.005
  C) 0.5
  D) 0.02
  Show Answer
  The correct answer is B .
• Question 22: In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N? Options:
  A) 20N
  B) 25N
  C) 50N
  D) 80N
  Show Answer
  The correct answer is B .
• Question 23:

  At what frequency would a capacitor of 2.5μF

  Used in radio circuit have a resistance of 250Ω

  Options:
  A) π/800 Hz
  B) 800/π Hz
  C) 200π Hz
  D) 2000π Hz
  Show Answer
  The correct answer is B .
• Question 24: The pressure of one mole of an ideal gas of volume 10^-2 m³ at a temperature of 27°c is
  [molar gas constant = 8.3 J mol^-1 k^-1] Options:
  A) 2.49 x 10⁴ Nm^-2
  B) 2.24 x 10⁴ Nm^-2
  C) 2.49 x 10⁵ Nm^-1
  D) 2.24 x 10⁵ Nm^-1
  Show Answer
  The correct answer is C .
• Question 25: How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC? Options:
  A) 39 . 98 x 10^-1J
  B) 9.75 x 10²J
  C) 3.98 x 10³J
  D) 9.75 x 10³J
  Show Answer
  The correct answer is B .
• Question 26: If a water pump at Kainji Dam is capable of lifting 1000kg of water through a vertical height of 10m in 10s, the power of the pump is [g = 10ms^-2] Options:
  A) 1.0kW
  B) 10.0kW
  C) 12.5kW
  D) 15.0kW
  E) 20.0kW
  Show Answer
  The correct answer is B .
• Question 27: Of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork? Options:
  A) 260Hz
  B) 252Hz
  C) 248Hz
  D) 264Hz
  E) 258Hz
  Show Answer
  The correct answer is A .
• Question 28: An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1] Options:
  A) 420S
  B) 336S
  C) 168S
  D) 48S
  Show Answer
  The correct answer is B .
• Question 29: What is the least possible error encountered when taking measurement with a meter rule? Options:
  A) 0.1mm
  B) 1.0mm
  C) 0.5mm
  D) 0.2mm
  Show Answer
  The correct answer is C .
• Question 30:

  If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?

  Options:
  A) 24 years
  B) 20 years
  C) 10 years
  D) 2 years
  Show Answer
  The correct answer is B .