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 121: The maximum permissible current through a galvanometer G of internal resistance 10$\mathrm{\Omega }$ is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G Options:
  A) 20,000 ohms in parallel
  B) 19,990 ohms in series
  C) 1990 ohms in series
  D) 100 ohms in series
  Show Answer
  The correct answer is C .
• Question 122:

  A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is

  Options:
  A) 400N
  B) 200N
  C) 100N
  D) 800N
  Show Answer
  The correct answer is D .
• Question 123: The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is Options:
  A) 3.0 x 10²Km^-1
  B) 3.0 x 10³Km^-1
  C) 5.0 x 10³Km^-1
  D) 3.0 x 10⁴Km^-1
  Show Answer
  The correct answer is B .
• Question 124:

  

  The correct position for a fuse in the diagram above is

  Options:
  A) between P and Q
  B) Q
  C) S
  D) P
  Show Answer
  The correct answer is D .
• Question 125: A pilot records the atmospheric pressure outside its plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and that of air = 0.00013) Options:
  A) 1200m
  B) 6300m
  C) 7500m
  D) 13800m
  Show Answer
  The correct answer is A .
• Question 126:

  The pinhole camera works on

  Options:
  A) the principle of the reversibility of light
  B) the principle of the rectilinear propagation of light
  C) Huygen’s principle
  D) the principle of total internal reflection of light
  Show Answer
  The correct answer is B .
• Question 127: The maximum power transfer occur in a cell when the external resistance is Options:
  A) Twice the internal resistance of the cell
  B) The same as the internal resistance of the cell
  C) Greater than the internal resistance of the cell
  D) Less than the internal resistance of the cell
  Show Answer
  The correct answer is B .
• Question 128: How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC? Options:
  A) 39 . 98 x 10^-1J
  B) 9.75 x 10²J
  C) 3.98 x 10³J
  D) 9.75 x 10³J
  Show Answer
  The correct answer is B .
• Question 129: A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at Options:
  A) 0^o
  B) 45^o
  C) 90^o
  D) 180^o
  Show Answer
  The correct answer is A .
• Question 130:

  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 .