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 841:

  

  The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water

  Options:
  A) 67cm
  B) 73cm
  C) 949cm
  D) 952cm
  E) 955cm
  Show Answer
  The correct answer is E .
• Question 842: 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 843:

  Musical instruments playing the same note can be distinguished from one another owing to the difference in their

  Options:
  A) quality
  B) pitch
  C) intensity
  D) loudness
  Show Answer
  The correct answer is A .
• Question 844:

  Ripple in a power supply unit is caused by

  Options:
  A) using an alternating current source
  B) forward voltage drop
  C) heavy load
  D) using a zener diode
  Show Answer
  The correct answer is D .
• Question 845: The physical properties of sound waves can best be described by Options:
  A) reflection and diffraction
  B) polarization and reflection
  C) polarization and diffraction
  D) polarization and refraction
  Show Answer
  The correct answer is A .
• Question 846: When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is Options:
  A) $\frac{2}{1}$R
  B) $\frac{1}{2}$R
  C) $\frac{3}{2}$R
  D) 5R
  Show Answer
  The correct answer is B .
• Question 847:

  If a source of solid is moving, a stationary listener will hear a sound of different frequency. This is called?

  Options:
  A) doppler effect
  B) resonance
  C) ultra sound
  D) rarefaction
  Show Answer
  The correct answer is A .
• Question 848: A 0.05kg bullet travelling at 500ms^-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet? Options:
  A) 25N
  B) 50N
  C) 250N
  D) 500N
  E) 25 000N
  Show Answer
  The correct answer is E .
• Question 849: A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms^-1 to 40ms^-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms^-1] Options:
  A) 15N
  B) 20N
  C) 35N
  D) 45N
  Show Answer
  The correct answer is C .
• Question 850:
  

  A 200 kg load is raised using a 110 m long lever as shown in the diagram above. The load is 10m from the pivot P. If the efficiency of the the lever is 80%, find the effort E required to lift the load.

  [Take g = 10ms-2]

  Options:
  A) 250
  B) 300
  C) 450
  D) 200
  Show Answer
  The correct answer is A .