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 1681:
  

  Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg

  [Take g = 9.8 ms-2]

  Options:
  A) $T_1$ = 2864 N, $T_2$= 3612 N
  B) $T_1$= 3612 N, $T_2$ = 2864 N
  C) $T_1$= 3502 N, $T_2$= 2760 N
  D) $T_1$ = 2760 N, $T_2$ = 3502 N
  Show Answer
  The correct answer is C .
• Question 1682: Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively? Options:
  A) $\frac{V}{r}$ - 1
  B) $\frac{2V}{r}$ - 1
  C) $\frac{U}{r}$ - 1
  D) $\frac{2U}{r}$ - 1
  Show Answer
  The correct answer is D .
• Question 1683: An electron of charge 1.6 x 10^-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10^-17J, the potential difference between the plate is Options:
  A) 30V
  B) 40V
  C) 300V
  D) 400V
  Show Answer
  The correct answer is C .
• Question 1684:

  

  In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is $\alpha$ and angle of refraction in air is $\beta$ which of following statements is true???

  Options:
  A) $\alpha =\beta$
  B) the efractive index of glass is $\frac{sin\theta }{sin\alpha }$
  C) The ray suffers total internal reflection if $\beta$ is greater than the critical angle
  D) the refractive index of glass is $\frac{sin\alpha }{sin\beta }$
  Show Answer
  The correct answer is D .
• Question 1685: A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water Options:
  A) i only
  B) ii only
  C) iii only
  D) i and ii
  E) i and iii
  Show Answer
  The correct answer is E .
• Question 1686:

  I. Melting
  II. Boiling
  III. Refraction
  IV. Conduction

  Which combination of the above is evident of the molecular nature of matter?

  Options:
  A) II , III and IV only
  B) I ,II and IV only
  C) I , III and IV only
  D) I , II and III only
  Show Answer
  The correct answer is B .
• Question 1687: Cathode rays are Options:
  A) high-energy electromagnetic waves
  B) protons
  C) streams of electrons
  D) neutrons
  E) radio waves
  Show Answer
  The correct answer is C .
• Question 1688:

  An air bubble of radius 4.5 cm initially at a depth of 12 m below the water surface rises to the surface. If the atmospheric pressure is equal to 10.34 m of water, the radius of the bubble just before it reaches the water surface is

  Options:
  A) 6.43 cm
  B) 8.24 cm
  C) 4.26 cm
  D) 5.82 cm
  Show Answer
  The correct answer is D .
• Question 1689: which of the following materials is a conductor? Options:
  A) Glass
  B) Wax
  C) Sodium
  D) Plastic
  Show Answer
  The correct answer is C .
• Question 1690: the pressure of 3 moles of an ideal gas at a temperature of 27°C having a volume of 10^-3m³ is Options:
  A) 2.49 x 10⁵-2
  B) 7.47 x 10⁵-2
  C) 2.49 x 10⁶-2
  D) 7.47 x 10⁶-2
  Show Answer
  The correct answer is D .