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 31: A 0 - 10mA galvanometer with a coil resistance of 30$\mathrm{\Omega }$ can be converted to a 0 - 10A ammeter by using Options:
  A) 0.03$\mathrm{\Omega }$ series resistor
  B) 0.03$\mathrm{\Omega }$ shunt resistor
  C) 9.99$\mathrm{\Omega }$ shunt resistor
  D) 9.99$\mathrm{\Omega }$ series resistor
  Show Answer
  The correct answer is B .
• Question 32: Which of the following represents the correct precision if the length of a piece of wire is measured with a meter rule? Options:
  A) 35mm
  B) 35.0mm
  C) 35.00mm
  D) 35.01mm
  Show Answer
  The correct answer is A .
• Question 33: The force of attraction between two point masses is 10^-4N when the distance between them is 0.18m. If the distance is reduced to 0.06m, calculate the force. Options:
  A) 1.1 x 10^-5N
  B) 3.3 x 10^-5N
  C) 3.0 x 10^-4N
  D) 9.0 x 10^-4N
  Show Answer
  The correct answer is D .
• Question 34:

  

  In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?

  Options:
  A) red, green and blue
  B) Green, red and blue
  C) Yellow , blue and red
  D) Blue , yellow and red
  Show Answer
  The correct answer is A .
• Question 35: A body is projected from the earth's surface with the intention of letting it escape from the earth's gravitational field. What is the minimum escape velocity of the body? [Earth's radius = 6.4 x 10³km, g = 10ms^-2] Options:
  A) 14 kms^-1
  B) 13 kms^-1
  C) 12 kms^-1
  D) 11 kms^-1
  Show Answer
  The correct answer is D .
• Question 36: Transverse waves can be distinguished from longitudinal waves using the characteristic of Options:
  A) diffraction
  B) refraction
  C) polarization
  D) reflection
  Show Answer
  The correct answer is C .
• Question 37: If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is Options:
  A) 1 : 6
  B) 1 : 3
  C) 2 : 1
  D) 6 : 1
  Show Answer
  The correct answer is D .
• Question 38: A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2] Options:
  A) 1000 N
  B) 700 N
  C) 110 N
  D) 10 N
  Show Answer
  The correct answer is D .
• Question 39: 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 40: If relative density of a metal is 19, what will be the mass of 20cm³ of the metal when immersed in water? Options:
  A) 380g
  B) 400g
  C) 360g
  D) 39g
  E) 180g
  Show Answer
  The correct answer is A .