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 341:

  

  The effect of closing the key K in the circuit shown above would be to

  Options:
  A) increase the current by 0.6A
  B) reduce the current by 0.6A
  C) increase the current by 0.4A
  D) keep the current unchanged
  Show Answer
  The correct answer is C .
• Question 342:

  0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg${}^1$ Cº. Calculate the specific latent heat of fusion of ice.

  Options:
  A) 9.0kjkg${}^{-1}$
  B) 84.0kjkg${}^{-1}$
  C) 134.0kjkg${}^{-1}$
  D) 168.0kjkg${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 343:

  A man will exert the greatest pressurewhen he?

  Options:
  A) lies flat on his back
  B) lies on his belly
  C) stands on both feet
  D) stands on the toes of one foot
  Show Answer
  The correct answer is D .
• Question 344: The unit of quantity of electricity is called Options:
  A) the ampere
  B) the volts
  C) the coulomb
  D) the ammeter
  E) electromotive force
  Show Answer
  The correct answer is C .
• Question 345: Which statement is NOT correct about molecules? Options:
  A) The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.
  B) Molecules are made up of atoms
  C) The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas
  D) Molecules of gases are in regular motion
  E) Molecules of a solid vibrate about their mean positions.
  Show Answer
  The correct answer is D .
• Question 346: A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is Options:
  A) 12.0%
  B) 25.0%
  C) 33.3%
  D) 75.0%
  Show Answer
  The correct answer is D .
• Question 347:

  A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

  Options:
  A) boron and antimony
  B) aluminium and antimony
  C) aluminium and indium
  D) arsenic and antimony
  Show Answer
  The correct answer is D .
• Question 348: If 1.2 x 10⁶J of heat energy is given off in 1 sec from a vessel maintained at a temperature gradient of 30Km^-1, the surface area of the vessel is Options:
  A) 1.0 x 10²m²
  B) 9. 0 x 10²m²
  C) 1.0 x 10³m²
  D) 9.0 x 10⁴m²
  Show Answer
  The correct answer is A .
• Question 349: A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction Options:
  A) $2\times {10}^{-4}J$
  B) $2\times {10}^{-3}J$
  C) $2\times {10}^{1}J$
  D) $2\times {10}^{2}J$
  Show Answer
  The correct answer is B .
• Question 350: One of the properties of the earth's magnetic field is that the Options:
  A) north pole lies in the northern hemisphere
  B) geographic and magnetic meridians coincide
  C) earth's magnetic flux is entirely horizontal at a place where the magnetic dip is zero
  D) earth's magnetic flux is entirely vertical at a place where the magnetic dip is zero
  Show Answer
  The correct answer is C .