NECO Physics Exam Past Questions and Answers

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 331: Evaporation of a liquid produces cooling of the liquid because the Options:
  A) attraction between the vapour molecules and the liquid molecules is great
  B) average kinetic energy of the liquid is reduced
  C) density of the liquid decreases
  D) vapour pressure above the liquid rises
  E) volume of the liquid decreases
  Show Answer
  The correct answer is B.
• Question 332: Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s. Options:
  A) 2.0 × 10⁴J
  B) 1.0 × 10⁴J
  C) 5.0 × 10³J
  D) 4.0 × 10³J
  E) 2.0 × 10²J
  Show Answer
  The correct answer is A.
• Question 333: In the normal use of a simple microscope, a person sees an Options:
  A) inverted, virtual and magnified image
  B) erect, virtual and magnified image
  C) erect, real and magnified image
  D) inverted, real and magnified image
  E) inverted and real image the same size as the object.
  Show Answer
  The correct answer is B.
• Question 334: The phenomenon of photoelectric effect is NOT used in Options:
  A) automatic doors
  B) bimetallic strip thermometers
  C) light meters in cameras
  D) setting off burglar alarms
  E) sound production from film tracks.
  Show Answer
  The correct answer is B.
• Question 335: A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency? Options:
  A) 57.20%
  B) 66.60%
  C) 83.30%
  D) 92.50%
  E) 100%
  Show Answer
  The correct answer is C.
• Question 336: An a.c. generator can be converted into a d.c. generator by replacing Options:
  A) the slip rings with split-ring commutators
  B) the slip rings with armatures
  C) the split-rings with slip rings
  D) the split-rings with brushes
  E) the brushes with slip-ring commutators.
  Show Answer
  The correct answer is A.
• Question 337: It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the Options:
  A) Crompton effect
  B) de Broglie’s laws
  C) Frank-Hertz experimental law
  D) Heisenberg’s uncertainly principle
  E) wave-particle paradox
  Show Answer
  The correct answer is D.
• Question 338: A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming that resistance changes uniformly with temperature, what is the resistance of the thermometer when the temperature is 45°C? Options:
  A) 27.8
  B) 17.8
  C) 13.6
  D) 6.4
  E) 3.6
  Show Answer
  The correct answer is C.
• Question 339: The silvered walls of a vacuum flask minimise loss of heat due to Options:
  A) conduction and convection
  B) conduction only
  C) convection and radiation
  D) convection only
  E) radiation only
  Show Answer
  The correct answer is E.
• Question 340: A body of mass M₁ moving with a velocity U collides with a stationary body of mass M₂ and both move with a common velocity V. If linear momentum is conserved, which expression correctly represents V? Options:
  A) M₁ + M₂ ÷ M₁U
  B) M₂U ÷ M₁ – M₂
  C) M₁U ÷ M₁ – M₂
  D) M₁U ÷ M₁+ M₂
  E) M₂U ÷ M₁ + M₂
  Show Answer
  The correct answer is D.