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 121:

  

  The figure above shows a uniform wood of weight 200N and length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. Calculate the tension in the cord if the wood is horizontal.

  Options:
  A) 10N
  B) 20N
  C) 100N
  D) 200N
  Show Answer
  The correct answer is D .
• Question 122:

  A man swung an object of mass 2 kg in a circular path with a rope 1.2 m long. If the object was swung at 120 rev/min, find the tension in the rope.

  Options:
  A) 400 N
  B) 288 N
  C) 240 N
  D) 379 N
  Show Answer
  The correct answer is D .
• Question 123: Calculate the magnitude of the electric field intensity in vacuum at a distance of 25cm from a charge of 5 × 10^-3C. [Take 1/4πε₀] Options:
  A) 7.2 × 108NC^-1
  B) 1.8 × 108NC^-1
  C) 5.6 × 108NC^-1
  D) 3.6 × 108NC^-1
  E) 1.5 × 106NC^-1
  Show Answer
  The correct answer is A .
• Question 124: A lead-acid accumulator is used in preference to a dry battery in a car because Options:
  A) a dry battery cannot supply the necessary high voltage
  B) a dry battery would not operate on a cold frosty morning
  C) the accumulator can give a bigger current and can be recharged
  D) the accumulator can supply a.c
  E) the chemicals used in a dry battery constitute a fire hazard.
  Show Answer
  The correct answer is C .
• Question 125: Normal atmospheric pressure at sea-level is 10⁵Nm^-2 and the acceleration due to gravity is approximately 10ms^-1. If the atmosphere has a uniform density of 1kgm^-3, its height is Options:
  A) 100m
  B) 1000m
  C) 10 000m
  D) 100 000m
  E) 1000 000m
  Show Answer
  The correct answer is C .
• Question 126:

  If the stress on a wire is 10${}^7$NM${}^{-2}$ and the wire is stretched from its original length of 10.00m to 10.05m. The young'smodulus of the wire is?

  Options:
  A) 5.0 x 10${}^{-4}$Nm${}^{-2}$
  B) 5.0 x 10${}^{-5}$Nm${}^{-2}$
  C) 2.0 x 10${}^{-8}$Nm${}^{-2}$
  D) 2.0 x 10${}^9$Nm${}^{-2}$
  Show Answer
  The correct answer is D .
• Question 127: Which of the following statements is correct about light and sound waves? Both Options:
  A) are longitudinal waves
  B) are transverse waves
  C) have the same velocity in air
  D) need a medium for propagation
  E) transmit energy
  Show Answer
  The correct answer is E .
• Question 128: The electric potential at a distance d from a point charge q in air of permittivity e_o is expressed as Options:
  A) q² ÷ 4πe_od
  B) q² ÷ 4πe_o
  C) q ÷ 4πe_od²
  D) q ÷ 4πe_od
  E) q ÷ 4πe_o²d
  Show Answer
  The correct answer is D .
• Question 129: What is the total electrical energy consumed by using an electric cooker rated 1000W for 5 hrs? Options:
  A) 5.3 x 10³J
  B) 6.5 X 10³J
  C) 1.8 X 10⁷J
  D) 2.3 X 10⁷J
  Show Answer
  The correct answer is C .
• Question 130: The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is Options:
  A) 0.00
  B) ^ε_o/₄
  C) ^ε_o/₂
  D) ε_o
  Show Answer
  The correct answer is D .