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 511: What is the least possible error in using a rule graduated in centimeters? Options:
  A) 0.1cm
  B) 0.5cm
  C) 1.0cm
  D) 2.0cm
  Show Answer
  The correct answer is A .
• Question 512:

  

  In the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X

  Options:
  A) 15 cm³
  B) 25 cm³
  C) 35 cm³
  D) 45 cm³
  Show Answer
  The correct answer is B .
• Question 513: Which of the following elements is the best absorber of X-rays? Options:
  A) hydrogen
  B) oxygen
  C) calcium
  D) copper
  E) lead
  Show Answer
  The correct answer is E .
• Question 514: In A.C circuit theory, the root means square (r.m.s) current, I_rms and the peak (maximum)current I_o are related by Options:
  A) I_o = $\frac{I_{r}ms}{\sqrt{2}}$
  B) I_rms = $\frac{I_o}{\sqrt{2}}$
  C) I_rms = $\frac{\frac{I}{I_o}}{\sqrt{2}}$
  D) I_rms = $\frac{I_{r}ms}{\sqrt{2}}$
  Show Answer
  The correct answer is B .
• Question 515: Ripples on water and light waves are similar because both Options:
  A) have the same frequency
  B) can be refracted and diffracted
  C) are longitudinal waves
  D) have the same velocity
  Show Answer
  The correct answer is C .
• Question 516: A magnet is similar to a bipolar charged system in that Options:
  A) it consists of two opposite poles - the north and south poles
  B) the earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole
  C) the force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges
  D) A and B only
  E) A and C only
  Show Answer
  The correct answer is E .
• Question 517: If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT? Options:
  A) 4:01
  B) 1:04
  C) 5:01
  D) 2:01
  Show Answer
  The correct answer is A .
• Question 518: Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface. Options:
  A) ii only
  B) ii and iii only
  C) i and iii only
  D) i, ii, and iii only
  Show Answer
  The correct answer is C .
• Question 519: The wavelength of a wave traveling with a velocity of 420 ms^-1 is 42 m. what is its period? Options:
  A) 1.2 s
  B) 1.0 s
  C) 0.5 s
  D) 0.1 s
  Show Answer
  The correct answer is D .
• Question 520:

  When a brick is taken from the earth's surface to the moon, its mass

  Options:
  A) Remains constant
  B) Becomes zero
  C) Reduces
  D) increases
  Show Answer
  The correct answer is A .