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 431: Which of the following is NOT part of an a.c generator? Options:
  A) Commutator
  B) Armature
  C) Field magnet
  D) Carbon brushes
  E) Slip rings
  Show Answer
  The correct answer is B.
• Question 432: In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum. Options:
  A) 0.14s
  B) 0.43s
  C) 2.32s
  D) 2.40s
  E) 6.97s
  Show Answer
  The correct answer is C.
• Question 433: The specific heat of a substance in the solid state is C₁; its specific beat in the liquid state is C₂ and its latent heat of fusion is L. If a mass M of the substance is changed from the solid state at temperature T, to the liquid state, also at temperature T, the amount of heat required will be Options:
  A) M(C₁ ÷ C₂) x T
  B) ML
  C) L
  D) M(C₁ + C₂) × T ÷ ML
  E) ML(C₁ + C₂ ÷ 2) × T
  Show Answer
  The correct answer is B.
• Question 434: An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively Options:
  A) (A – 2) and (Z – 2)
  B) (A + 4) and (Z + 2)
  C) (A– 4) and (Z+2)
  D) (A+ 4) and (Z – 2)
  E) (A – 4) and (Z – 2)
  Show Answer
  The correct answer is A.
• Question 435:

  400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 300°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)

  Options:
  A) 10°C
  B) 15°C
  C) 20°C
  D) 30°C
  E) 40°C
  Show Answer
  The correct answer is A.
• Question 436: The heat from a fire in a closed room reaches someone far away in the room, mainly by Options:
  A) reflection
  B) diffusion
  C) conduction
  D) radiation
  E) convection
  Show Answer
  The correct answer is D.
• Question 437: Which of the following is used in a nuclear reactor to slow down fast moving neutrons? Options:
  A) graphite rods
  B) carbon dioxide gas
  C) liquid sodium metal
  D) concrete shield
  E) boron rods
  Show Answer
  The correct answer is A.
• Question 438: When electrical power is transmitted over long distances, the voltage is stepped up so that Options:
  A) the resistance of the wire may be increased proportionately to the potential difference
  B) the time of transmissions between the generating and the receiving stations may be reduced
  C) there is increased current to produce brighter lights.
  D) the rate of electrical consumption is increased.
  E) the energy waste may be minimised as the current is lowered.
  Show Answer
  The correct answer is E.
• Question 439:

  A gas occupies a certain volume at 27°C. At what temperature will its pressure remains constant?

  Options:
  A) 54°C
  B) 108°C
  C) 150°C
  D) 327°C
  E) 600°C
  Show Answer
  The correct answer is D.
• Question 440: When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is Options:
  A) anti-clockwise
  B) clockwise
  C) equal to the product to the forces
  D) numerically equal to the total forces acting
  E) equal to zero
  Show Answer
  The correct answer is B.