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 801: Light of wavelength 5000 x 10^-8cm travels in free space with a velocity of 3 x 10⁸ms^-1. What is its wavelength in glass of refractive index 1.5? Options:
  A) 3333 x 10^-8cm
  B) 5000 x 10^-8cm
  C) 6666 x10^-8cm
  D) 750010^-8cm
  Show Answer
  The correct answer is A .
• Question 802: Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is Options:
  A) conical
  B) cubical
  C) cylindrical
  D) parabolic
  E) spherical
  Show Answer
  The correct answer is C .
• Question 803: What gives rise to the line spectra observed in atoms? Options:
  A) change of an electron from a higher to a lower energy level in the atom
  B) disturbed protons in the nucleus
  C) excitation of an electron in the atom
  D) kinetic energy of a moving atom
  E) potential energy of an electron inside an atom
  Show Answer
  The correct answer is A .
• Question 804: A body of mass 40g loses 80J of heat energy. If the specific heat capacity of the body is 400 Jkg^-1, calculate the change in temperature of the body. Options:
  A) 0.2K
  B) 0.4K
  C) 2.0K
  D) 5.0K
  E) 10.0K
  Show Answer
  The correct answer is D .
• Question 805: The electromagnetic waves that are sensitive to temperature changes are Options:
  A) X-rays
  B) Gamma-rays
  C) Ultra-violet rays
  D) Infra-red rays
  Show Answer
  The correct answer is D .
• Question 806: An element and its isotope only differ in the number of Options:
  A) protons
  B) electrons
  C) ions
  D) neutrons
  Show Answer
  The correct answer is D .
• Question 807: A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby. Options:
  A) $\sqrt{2GM}$ ÷ R
  B) $\frac{\sqrt{2GM}}{R}$
  C) $\frac{\sqrt{2G}}{MR}$
  D) $\sqrt{2GMR}$
  E) $\frac{\sqrt{R}}{2GM}$
  Show Answer
  The correct answer is B .
• Question 808:

  

  In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

  Options:
  A) 40N
  B) 80N
  C) 120N
  D) 200N
  Show Answer
  The correct answer is B .
• Question 809: Cathode rays are Options:
  A) high-energy electromagnetic waves
  B) protons
  C) streams of electrons
  D) neutrons
  E) radio waves
  Show Answer
  The correct answer is C .
• Question 810: In 90 seconds, the mass of a radioactive element reduces to $\frac{1}{16}$ of its original value. Determine the half- life of the element. Options:
  A) 15.0s
  B) 18.0s
  C) 22.5s
  D) 30.0s
  E) 45.0s
  Show Answer
  The correct answer is C .