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 271:

  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 272: Calculate the light of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high Options:
  A) 10 cm
  B) 16 cm
  C) 5 cm
  D) 14 cm
  Show Answer
  The correct answer is D .
• Question 273:

  A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

  Options:
  A) white light Is an electromagnetic wave
  B) the prism has all the colours of the white light
  C) different colours of white light travel with different speeds in glass
  D) white light has undergone total Internal reflection in the prism
  Show Answer
  The correct answer is C .
• Question 274: In a resonance tube experiment, the effective length of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting and effect, the velocity of sound in air is Options:
  A) 96ms^-1
  B) 255ms^-1
  C) 340ms^-1
  D) 384ms^-1
  Show Answer
  The correct answer is D .
• Question 275: A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is Options:
  A) 5.0 x 10⁶
  B) 1.0 x 10⁶
  C) 2.5 x 10⁶
  D) 2.5 x 10⁵
  E) 5.0 x 10⁵
  Show Answer
  The correct answer is E .
• Question 276:

  The potential energy in an elastic string of force constant k, which has an extension X is?

  Options:
  A) kX
  B) KX${}^2$
  C) ½KX${}^2$
  D) ½K
  Show Answer
  The correct answer is C .
• Question 277: A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10^-6K^-1? Options:
  A) 2.0036m
  B) 2.0018cm
  C) 2.1800
  D) 2.0360m
  Show Answer
  The correct answer is A .
• Question 278: A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are Options:
  A) beta rays
  B) gamma rays
  C) x-rays
  D) unltr-violet rays
  Show Answer
  The correct answer is A .
• Question 279: A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket? Options:
  A) 500,000N
  B) 500N
  C) 50N
  D) 5,000N
  E) 50,000N
  Show Answer
  The correct answer is C .
• Question 280: A pool of water appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.33, what is the actual depth of the pool? Options:
  A) 0.750m
  B) 1.013m
  C) 1.330m
  D) 13.3000m
  Show Answer
  The correct answer is C .