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 191:
  

  Three forces with magnitudes 16 N, 12 N and 21 N are shown in the diagram below. Determine the magnitude of their resultant force and angle with the x-axis

  Options:
  A) 7.63N,61°
  B) 8.71N,61°
  C) 7.63N,29°
  D) 8.71N,29°
  Show Answer
  The correct answer is B .
• Question 192: An object is placed in front of two plane mirrors inclined at an angle of 0^o. If the total number of images formed is 7, Find the value of $\theta$ Options:
  A) 30^o
  B) 45^o
  C) 51^o
  D) 90^o
  Show Answer
  The correct answer is B .
• Question 193:

  If the frequency of an emitted x-ray is 1.6 x 10¹⁶Hz, the accelerating potential is?

  [e = 1.6 x 10^-19C, h = 6.63 x 10^-34Js]

  Options:
  A) 6630.0V
  B) 663.0V
  C) 66.3V
  D) 6.6V
  Show Answer
  The correct answer is C .
• Question 194:

  The number of holes in an intrinsic semiconductor

  Options:
  A) is not equal to the number of free electrons
  B) is greater than the number of free electrons
  C) is equal to the number of free electrons
  D) is less than the number of free electrons
  Show Answer
  The correct answer is C .
• Question 195:

  Which of the following is NOT an example of elementary modern physics?

  Options:
  A) Classical mechanics
  B) Quantum mechanics
  C) Special relativity
  D) Nuclear physics
  Show Answer
  The correct answer is A .
• Question 196: A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is Options:
  A) 200C
  B) 50C
  C) 12C
  D) 0.002C
  Show Answer
  The correct answer is C .
• Question 197: A light wave of frequency 5 x 10¹⁴Hz moves through water which has a refractive index of $\frac{4}{3}$. Calculate the wavelength in water if the velocity of light in air is 3 x 10⁸ms^-1 Options:
  A) 4.5 x 10^-7m
  B) 6.0 x 10^-7m
  C) 1.7 x 10⁶m
  D) 2.2 x 10⁶m
  Show Answer
  The correct answer is A .
• Question 198:

  The vapour pressure?

  Options:
  A) increases non-linearly with measuring temperature
  B) increases linearly with increasing temperature
  C) decreases linearly with increasing temperature
  D) decreases non-linearly ith measuring temperature
  Show Answer
  The correct answer is A .
• Question 199: Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel. Options:
  A) i only
  B) ii and iii only
  C) i and ii only
  D) i, ii, and iii.
  Show Answer
  The correct answer is C .
• Question 200:

  Which of the following statements is not true?

  Options:
  A) The mechanical advantage of a smooth inclined plane depends on the ratio of the length to the height of the plane.
  B) The efficiency of an inclined plane decreases as the slope increases.
  C) The effort required to push a given load up an inclined plane increases as the slope increases.
  D) As the slope of an inclined plane increases, the velocity ratio decreases.
  Show Answer
  The correct answer is A .