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 221:

  

  The figure above shows a block of mass m sliding down a rough inclined plane QP at angle $\theta$ . The forces acting on the block along QP are

  Options:
  A) mg sinθ and the normal reaction
  B) mg sinθ and the force of friction
  C) mg sinθ and the normal reaction
  D) mg cosθ and the normal reaction
  Show Answer
  The correct answer is B .
• Question 222:

  

  In the series a.c circuit shown above, the p.d across the inductor is 8V_r.m.s and that across the resistor is 6V_r.m.s. The effective voltage is

  Options:
  A) 2V
  B) 10V
  C) 14V
  D) 48V
  Show Answer
  The correct answer is B .
• Question 223: An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is Options:
  A) 7.2kg
  B) 33.2kg
  C) 43.2kg
  D) 53.2kg
  Show Answer
  The correct answer is D .
• Question 224: When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a? Options:
  A) Simple microscope
  B) refecting lens
  C) compound microscope
  D) projector
  Show Answer
  The correct answer is A .
• Question 225: 1,000 identical drops of oil of density 500kgm^-3 have a total mass of 5 x 10^-4kg. One of the drops forms a thin film of area 0.5m² on water. The thickness of the film is Options:
  A) 2 x 10^-8m
  B) 2 x 10^-9m
  C) 2 x 10^-7m
  D) 3 x 10^-9m
  E) 2.8 x 10^-8m
  Show Answer
  The correct answer is B .
• Question 226: A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60^o with the vertical. The work done is Options:
  A) 0.500 J
  B) 0.250 J
  C) 0.050 J
  D) 0.025 J
  Show Answer
  The correct answer is D .
• Question 227: The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. calculate the frequency of the photon.
  [e = 1.6 x 10^-19c; h = 6.6 x 10^-13js] Options:
  A) 1.3 x 10^-15 Hz
  B) 3.1 x 10⁵² Hz
  C) 3.2 x 10^-53 Hz
  D) 8.0 x 10¹⁴ Hz
  Show Answer
  The correct answer is D .
• Question 228: When an atom loses or gains a charge, it becomes an Options:
  A) ion
  B) an electron
  C) a neutron
  D) a proton
  E) a deuteron
  Show Answer
  The correct answer is A .
• Question 229: which of the following is NOT correct? i. the pitch of a sound note depends on the frequency of vibrations. ii. the intensity of a sound note is proportional to the amplitude of vibrations. iii. beats are produced by two sources of sound because one wave is travelling faster than the other. iv. when two sources of sound of frequencies 500Hz and 502Hz are sounded together, a beat frequency of 2Hz is observed. v. the first harmonic of a tone have double the frequency of the fundamental note. Options:
  A) i and ii
  B) ii and iii
  C) i and iii
  D) iii and iv
  E) iv and v
  Show Answer
  The correct answer is A .
• Question 230:

  A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

  Options:
  A) in front of his palm
  B) behind his palm
  C) beside his palm
  D) into his palm
  Show Answer
  The correct answer is D .