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 1221: 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 1222: In a discharge tube, most of the gas is pumped out so that electricity is conducted at Options:
  A) low voltage
  B) steady voltage
  C) high pressure
  D) low pressure
  Show Answer
  The correct answer is D .
• Question 1223: in a pure semiconductor, the number of electrons in the conduction band is Options:
  A) less than the number of holes in the valence band
  B) equal to the number of holes in the valence band
  C) greater than the number of holes in the valence band
  D) twice the number of holes in the valence band
  Show Answer
  The correct answer is B .
• Question 1224:

  A 2H inductor has negligible resistance and is connected to a $\frac{50}{\pi }$ Hz A.C supply. The reactance of the inductor is?

  Options:
  A) 200$\mathrm{\Omega }$
  B) 50$\mathrm{\Omega }$
  C) $\frac{100}{\pi }$
  D) $\frac{25}{\pi \mathrm{\Omega }}$
  Show Answer
  The correct answer is A .
• Question 1225: One of the properties of gamma rays is that they are? Options:
  A) neutral
  B) massive
  C) positively charged
  D) negatively charged
  Show Answer
  The correct answer is A .
• Question 1226: When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the Options:
  A) lost energy
  B) work function
  C) binding energy
  D) stability energy
  Show Answer
  The correct answer is C .
• Question 1227: The primary aim in high tension transmission is to Options:
  A) minimize electrical energy losses due to heat production
  B) increase the rate of energy transfer by using high voltage
  C) increase the current in the wire
  D) generate electricity at high current and low voltage
  Show Answer
  The correct answer is A .
• Question 1228: A progressive wave is represented by $y=10\text{Sin}(1000\pi t-\frac{\pi x}{34})$ . two layers of the wave separated by 153cm have a phase difference of Options:
  A) 270⁰
  B) 45⁰
  C) 90⁰
  D) 180⁰
  E) No Correct Option
  Show Answer
  The correct answer is E .
• Question 1229: A man stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weight Options:
  A) greater than the weight of the man
  B) the same as the weight of the man
  C) of zero
  D) less than the weight of the man
  E) greater than the weight of the man by 1kg
  Show Answer
  The correct answer is B .
• Question 1230: In which of the following arrangements is the wavelength in an increasing order? Options:
  A) Gamma rays, infra-red rays, x-rays, radiowaves
  B) Gamma rays, x-rays, infra-red ray, radiowaves
  C) Radiowaves, x-rays, gamma ray, infra-red rays
  D) Infra-red rays, radiowaves, x-rays, gamma rays
  Show Answer
  The correct answer is B .