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 1031: The main function of the commutator in a simple d.c. motor is to Options:
  A) enable the armature to rotate freely
  B) increase the flux linking the armature windings
  C) maintain a direct current in the armature
  D) provide uniform magnetic field around the armature
  E) reverse the direction of the current in the armature.
  Show Answer
  The correct answer is E .
• Question 1032:

  A certain radioactive source emits radiation that was found to be deflected by both magneticand electric fields. The radiation is?

  Options:
  A) beta rays
  B) gamma rays
  C) x-rays
  D) ultra-violet rays
  Show Answer
  The correct answer is A .
• Question 1033: Calculate the specific latent heat of vaporization of steam of 1.13 x 106J pf heat energy is required to convert 15kg of it to water. Options:
  A) 7.53 x 105 Jkg${}^{-1}$
  B) 7.53 x 10-2Jkg${}^{-1}$
  C) 7.53 x 104Jkg${}^{-1}$
  D) 7.53 x 10-3Jkg${}^{-1}$
  Show Answer
  The correct answer is C .
• Question 1034:

  Metal rods of length 20m each are laid end to end to form a bridge at 25^oC. What gap will be provided between consecutive rails for the bridge to withstand 75^oC?

  [Linear expansivity of the material = 2.0 x 10^-5K^-1]

  Options:
  A) 0.20m
  B) 0.22m
  C) 0.25m
  D) 0.02m
  Show Answer
  The correct answer is D .
• Question 1035: A plane inclined at angle $\theta$ has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by Options:
  A) tan$\theta$ = $\frac{1}{10}$
  B) cot$\theta$ = $\frac{1}{10}$
  C) cos$\theta$ = $\frac{1}{10}$
  D) sin$\theta$ = $\frac{1}{10}$
  Show Answer
  The correct answer is D .
• Question 1036: A blacksmith heated a metal whose cubic expansivity is 6.3 x 10^-6K^-1. The areal expansivity is Options:
  A) 2.0 x 10^-6K^-1
  B) 2.1 x 10^-6K^-1
  C) 4.2 x 10^-6K^-1
  D) 6.3 x 10^-6K^-1
  Show Answer
  The correct answer is C .
• Question 1037:

  An incident ray XY makes an angle of 15${}^{\circ }$ with a fixed line AY which is normal to surface of a plane mirror if the mirrow is turned as indicated by the arrow through ${40}^{\circ }$, what angle will the reflected ray make with AY?

  Options:
  A) ${25}^{\circ }$
  B) ${40}^{\circ }$
  C) ${15}^{\circ }$
  D) ${55}^{\circ }$
  E) ${95}^{\circ }$
  Show Answer
  The correct answer is D .
• Question 1038: Which of the following properties is/are common to all waves? i. Diffraction ii. Refraction iii. Interference Options:
  A) i only
  B) ii only
  C) ii and iii
  D) i, ii, and iii
  Show Answer
  The correct answer is D .
• Question 1039: A lens of focal length 12.0cm forms an upright image three times the size of a real object. The distance between the object and the images is Options:
  A) 8.0cm
  B) 16.0cm
  C) 24.0cm
  D) 32.0cm
  Show Answer
  The correct answer is D .
• Question 1040: The mass of a proton is approximately equal to that of Options:
  A) an $\alpha$-particle
  B) a $\beta$-particle
  C) $\gamma$-ray
  D) an electron
  E) a neutron
  Show Answer
  The correct answer is E .