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 811:

  

  A block of mass m is held in equilibrium against a vertical wall by a horizontal force. If the coefficient of friction between the wall and the block is µ, the minimum value of the horizontal force is

  Options:
  A) µmg
  B) (1-µ)mg
  C) (1+µ)mg
  D) mg/µ
  Show Answer
  The correct answer is D .
• Question 812: The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth? Options:
  A) 1.92N
  B) 2.88N
  C) 6.72N
  D) 8.00N
  E) 12.00N
  Show Answer
  The correct answer is E .
• Question 813: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .
• Question 814: Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple? Options:
  A) 1000 Nm
  B) 500 Nm
  C) 10 Nm
  D) 5 Nm
  E) 1.6 Nm
  Show Answer
  The correct answer is C .
• Question 815: Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x10⁶m Options:
  A) 25.3kms^-1
  B) 4.2kms^-1
  C) 4.0kms^-1
  D) 11.3kms^-1
  Show Answer
  The correct answer is D .
• Question 816: Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V. Options:
  A) 0.02 J
  B) 0.10 J
  C) 0.20 J
  D) 1.00 J
  E) 10.00 J
  Show Answer
  The correct answer is E .
• Question 817: The ratio of the coefficient of linear expansion of two metals ^∝₁/_∝2 is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, ^e₁/_e2 is 1:2, the ratio of the original lengths ^l₁/_l2 is Options:
  A) ⁸/₃
  B) ³/₂
  C) ²/₃
  D) ³/₈
  Show Answer
  The correct answer is C .
• Question 818: I. MeltingII. Boiling III. RefractionIV. ConductionWhich combination of the above is evident of the molecular nature of matter? Options:
  A) II , III and IV only
  B) I ,II and IV only
  C) I , III and IV only
  D) I , II and III only
  Show Answer
  The correct answer is B .
• Question 819: An astronomical telescope is said to be in normal adjustment when the Options:
  A) eye is accommodated
  B) focal length of objective lens is longer than that of eye piece
  C) final image is at the near point of eye
  D) final image is at infinity
  Show Answer
  The correct answer is D .
• Question 820: Steam burn is more severe than that of boiling water because Options:
  A) steam burn is independent of relative humidity
  B) stem possesses greater heat energy per unit mass
  C) water boils at a higher temperature
  D) steam burn is dependent on relative humidity
  Show Answer
  The correct answer is B .