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 2141:

  

  Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?

  Options:
  A) II only
  B) III only
  C) I and IV only
  D) II and III only
  Show Answer
  The correct answer is B .
• Question 2142:

  

  Three 2-µF capacitors are arranged as seen in the circuit above . The effective capacitance between E and F is

  Options:
  A) 0.75µF
  B) 1.33µF
  C) 3.00µF
  D) 6.00µF
  Show Answer
  The correct answer is B .
• Question 2143: The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because Options:
  A) atmospheric pressure acts on the surface of the lake
  B) pressure increases with depth
  C) density remains constant with pressure
  D) the bubble experiences an upthrust
  Show Answer
  The correct answer is B .
• Question 2144:

  A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms^-2]

  Options:
  A) 68N
  B) 28N
  C) 17N
  D) 7N
  Show Answer
  The correct answer is C .
• Question 2145: An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because Options:
  A) ebonite has a negative charge while glass has a positive charge
  B) ebonite has a positive charge while glass has a negative charge
  C) both have negative charges
  D) both have positive charges
  Show Answer
  The correct answer is A .
• Question 2146:

  Which of the following statements about radioactivity is true?

  (i) Alpha particle is positively charged

  (ii)Beta particle is negativelycharged

  (iii) Gamma ray is neutral

  (iv) Beta particle has thesame massas helium atom

  (v) Gamma ray is charged.

  Options:
  A) i, ii, iii, iv only
  B) i, ii, iii only
  C) iv and v only
  D) i, ii and v only
  Show Answer
  The correct answer is B .
• Question 2147: Which of the following statements are correct about an object in equilibrium under parallel forces? i. the total clockwise moments of the forces about any point equals the total anti-clockwise moments about the same point. ii. the total forces in one direction equals the total forces in the opposite direction. iii. the resolved components along the x-axis equals the resolved components along the y-axis. Options:
  A) i and ii only
  B) i and iii only
  C) ii and iii
  D) i, ii, and iii only
  Show Answer
  The correct answer is A .
• Question 2148:

  Particles of mass 10${}^{-2}$kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad${}^{-1}$. If the radius of the blade is 0.2m, the centripetalforce is?

  Options:
  A) 2N
  B) 20N
  C) 200N
  D) 400N
  Show Answer
  The correct answer is B .
• Question 2149:

  The energy of a photo having a wavelength of 10^-10m is

  (h= 6.63 x 10 ^-34Js, c =3.0 x 10 ⁸ms^-1)

  Options:
  A) 2.0 x 10 ^-15J
  B) 1.7 x 10 ^-13J
  C) 2.0 x 10 ^-12J
  D) 1.7 x 10 ^-12J
  Show Answer
  The correct answer is A .
• Question 2150: A lamp is rated 240V, 60W. The resistance of the filament is Options:
  A) 960$\mathrm{\Omega }$
  B) 16$\mathrm{\Omega }$
  C) 15$\mathrm{\Omega }$
  D) 4$\mathrm{\Omega }$
  Show Answer
  The correct answer is A .