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 21:

  A semiconductor is formed by?

  Options:
  A) co-ordinate bonds
  B) electrovalent bonds
  C) a substance free of bonds
  D) covalent bonds
  Show Answer
  The correct answer is D .
• Question 22:

  Which of the following pairs ispart of the electromagnetic spectrum?

  I. Radio waves

  II. sound waves

  III. Gamma rays

  IV. water waves

  Options:
  A) I and II
  B) III and IV
  C) I and III
  D) II and IV
  Show Answer
  The correct answer is C .
• Question 23: When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is Options:
  A) $\frac{R}{4}$
  B) $\frac{R}{3}$
  C) $\frac{R}{2}$
  D) 2$\frac{R}{3}$
  E) R
  Show Answer
  The correct answer is A .
• Question 24: Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is Options:
  A) 4A
  B) 36A
  C) 12A
  D) 24A
  E) 10A
  Show Answer
  The correct answer is C .
• Question 25: Musical instruments playing the same note can be distinguished from one another owing to the differences in their Options:
  A) quality
  B) pitch
  C) intensity
  D) loudness
  Show Answer
  The correct answer is A .
• Question 26: An electron makes a transition from a certain energy level E_k to the ground state E₀. If the frequency of emission is 8.0 x 10¹⁴Hz The energy emitted is Options:
  A) 8.25 x 10^-19J
  B) 5.28 x 10^-19J
  C) 5.28 x 10¹⁹J
  D) 8.25 x 10¹⁹J
  Show Answer
  The correct answer is B .
• Question 27: What part of the camera corresponds to the iris of the eye? Options:
  A) diaphragm
  B) film
  C) focusing ring
  D) lens
  E) shutter
  Show Answer
  The correct answer is A .
• Question 28: If a tube of small radius opened at both ends is placed in a liquid, the liquid will Options:
  A) remain at the same level irrespective of whether the liquid wet the glass or not
  B) fall below the liquid level if the liquid wets the glass
  C) falls below the liquid level if the liquid does not wet the glass
  D) rise above the liquid level if the liquid does not wet the glass
  Show Answer
  The correct answer is C .
• Question 29:

  The height at which the atmosphere cases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

  (ρm = 13.6g/cm${}^3$ ρ = 0.00013g/cm${}^3$ )

  Options:
  A) 380mmHg
  B) 570mmHg
  C) 190mmHg
  D) 480mmHg
  Show Answer
  The correct answer is B .
• Question 30:

  The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

  Options:
  A) 6.5 cm
  B) 7.5 cm
  C) 8.5 cm
  D) 4.5 cm
  Show Answer
  The correct answer is B .