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 251: An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5. Options:
  A) 1.0cm
  B) 1.5cm
  C) 2.0cm
  D) 2.5cm
  Show Answer
  The correct answer is A .
• Question 252: If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is? Options:
  A) 25%
  B) 33%
  C) 75%
  D) 82%
  Show Answer
  The correct answer is C .
• Question 253: If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is Options:
  A) 10cm
  B) 15cm
  C) 16cm
  D) 19cm
  E) 20cm
  Show Answer
  The correct answer is B .
• Question 254: A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10^oC. If a temperature rise of 30^oC is obtained after 10min, the heat capacity of the material is Options:
  A) 6.0 x 10⁴J^oC^-1
  B) 4.0 x 10⁴J^oC^-1
  C) 1.2 x 10⁴J^oC^-1
  D) 8.0 x 10⁴J^oC^-1
  Show Answer
  The correct answer is B .
• Question 255: The density of a solid is defined as the Options:
  A) mass of the solid compared to the mass of an equal volume of water
  B) amount of water displaced when a unit mass of thesolid is immersed in it
  C) weight per unit volume of the solid
  D) volume per unit mass of the solid
  E) mass per unit volume of the solid
  Show Answer
  The correct answer is E .
• Question 256: A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is Options:
  A) Bqv
  B) Bq$\frac{v}{m}$
  C) Bqvm
  D) mv$\frac{B}{q}$
  E) $\frac{mv}{Bq}$
  Show Answer
  The correct answer is C .
• Question 257: The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is Options:
  A) longer than 700nm
  B) shorter than 700nm but longer then 400nm
  C) 550nm
  D) shorter than 400nm
  E) infinite
  Show Answer
  The correct answer is D .
• Question 258:

  A rectangular solid black has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density 100kg/m${}^3$, calculate the pressure it exerts on the surface.

  Options:
  A) 200 N/m${}^2$
  B) 100 N/m${}^2$
  C) 400 N/m${}^2$
  D) 300 N/m${}^2$
  Show Answer
  The correct answer is A .
• Question 259:

  If the fraction of the atoms of a radioactive material left after 120years is $\frac{1}{64}$, what is the half-life of the material?  $\frac{1}{64}$

  Options:
  A) 20 years
  B) 10 years
  C) 2 years
  D) 24 years
  Show Answer
  The correct answer is A .
• Question 260: Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will Options:
  A) have any one force being the equilibrant of the other two
  B) make a body move randomly
  C) make a body oscillate
  D) move a body along a straight line
  E) rotate a body about its axis
  Show Answer
  The correct answer is A .