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 71:

  Which of the following statements regarding the application of electrical conduction via gases is/are correct?
  Electrical conduction in gas is applied in:
  (i) The identification of gases
  (ii) Lighting/fluorescent tubes
  (iii) Photocells
  (iv) Cathode ray oscilloscope/T.V. tubes

  Options:
  A) (i), (iii) and (iv) only
  B) (i), (ii) and (iv) only
  C) (ii), (iii) and (iv) only
  D) (i), (ii) and (iii) only
  Show Answer
  The correct answer is B .
• Question 72: An arrow of mass 0.1kg moving with a horizontal velocity of 15ms^-1 is shot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Their common velocity after impact is Options:
  A) 15.0 ms^-1
  B) 7.5 ms^-1
  C) 3.8 ms^-1
  D) 3.0 ms^-1
  Show Answer
  The correct answer is D .
• Question 73:

  A safety precaution designed to prolong the life of a lead acid accumulator is

  Options:
  A) By topping up the cells with concentrated acid
  B) The use of naked flame when charging the battery
  C) Keeping the specific gravity of the electrolyte within specified range
  D) By connecting wires to the terminals directly when testing the level of charging
  Show Answer
  The correct answer is C .
• Question 74: A particle of weight 120N is placed on a plane inclined at 30⁰ to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane? Options:
  A) 50N
  B) 100N
  C) 175N
  D) 210N
  Show Answer
  The correct answer is B .
• Question 75:

  Aluminium is sometimes used as the leaf of an electroscope because it

  Options:
  A) is a light material
  B) is a good conductor
  C) is a good insulator
  D) can be converted into thin sheets
  Show Answer
  The correct answer is D .
• Question 76:

  

  A particle is injected perpendicularly into an electric field, it travels along a curved path as depicted in the image above,the particle is

  Options:
  A) gamma ray
  B) electron
  C) neutron
  D) proton
  Show Answer
  The correct answer is B .
• Question 77: A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours? Options:
  A) 1/32
  B) 1/16
  C) 1/8
  D) 1/4
  E) 1/2
  Show Answer
  The correct answer is B .
• Question 78: What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42? Options:
  A) 21^o
  B) 22^o
  C) 23^o
  D) 24^o
  Show Answer
  The correct answer is D .
• Question 79:

  The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20º and 80ºC respectively is?

  Options:
  A) 3.0 x 10${}^2$km${}^{-1}$
  B) 3.0 x 10${}^3$km${}^{-1}$
  C) 5.0 x 10${}^3$km${}^{-1}$
  D) 3.0 x 10${}^4$km${}^{-1}$
  Show Answer
  The correct answer is B .
• Question 80: Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface. Options:
  A) ii only
  B) ii and iii only
  C) i and iii only
  D) i, ii, and iii only
  Show Answer
  The correct answer is C .