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 171: If a source of sound 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) Diffraction of sound
  E) Rarefaction
  Show Answer
  The correct answer is A .
• Question 172: The threshold of frequency for photoelectric effect depends on the Options:
  A) intensity of incident light
  B) frquency of incident light
  C) material of the photocathode
  D) potential difference between the cathode and the anode
  Show Answer
  The correct answer is C .
• Question 173: When an ebolite rod is rubbed with fur, it has Options:
  A) no charge at all
  B) a negative charge
  C) a positive charge
  D) negative and positive charges
  Show Answer
  The correct answer is B .
• Question 174: Find the frequencies of the first three harmonics of a piano string of length 1.5m, if the velocity of the wave on the string is 120ms^-1 Options:
  A) 40Hz, 80Hz, 120Hz
  B) 80Hz, 160Hz, 240Hz
  C) 180Hz, 360Hz, 540Hz
  D) 369Hz, 180Hz, 90Hz
  Show Answer
  The correct answer is A .
• Question 175: If the inclination at Ibadan is 7^oS, this means that Options:
  A) the angle between the geographic meridian and the magnetic meridian at Ibadan is 7^o
  B) the earth's magnetic intensity at Ibadan makes angle 7^o with the horizontal direction
  C) a magnetic needle will be inclined at 7^o to the vertical at Ibadan
  D) the north pole of a magnetic needle dips downward at Ibadan
  Show Answer
  The correct answer is B .
• Question 176: When an atom loses or gains a charge, it becomes an Options:
  A) ion
  B) an electron
  C) a neutron
  D) a proton
  E) a deuteron
  Show Answer
  The correct answer is A .
• Question 177: It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus? Options:
  A) an electron
  B) a $\beta$-particle
  C) an $\alpha$-particle
  D) a proton
  E) an atom
  Show Answer
  The correct answer is D .
• Question 178:

  In which of the following device in the expansion of solid is a disadvantages?

  I. Simple pendulum

  II. Fire alarms

  III. Thermostat

  IV. Bimetallic thermometer

  Options:
  A) III only
  B) II & III only
  C) I only
  D) II, III & IV only
  Show Answer
  The correct answer is C .
• Question 179:

  

  In the above circuit, The fuse wire melts when

  Options:
  A) K is Opened
  B) K is closed
  C) the 14 ohm resistor is doubled with k closed
  D) the 6 ohm resistor is doubled with k closed
  Show Answer
  The correct answer is B .
• Question 180: A radioisotope has a decay constant of 10^-7s^-1. The average life of the radioisotope is Options:
  A) 1.00 x 10⁷s
  B) 6.93 x 10⁸s
  C) 1.00 x 10^-7s
  D) 6.93 x 10⁷s
  Show Answer
  The correct answer is B .