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 311:

  A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

  Options:
  A) $\frac{u}{v}$
  B) $\frac{u}{2}$
  C) u
  D) 2u
  E) $\frac{u}{m}$
  Show Answer
  The correct answer is B.
• Question 312: In 90 seconds, the mass of a radioactive element reduces to $\frac{1}{16}$ of its original value. Determine the half- life of the element. Options:
  A) 15.0s
  B) 18.0s
  C) 22.5s
  D) 30.0s
  E) 45.0s
  Show Answer
  The correct answer is C.
• Question 313: Which of the following statements about the concept of solid friction is NOT true? Options:
  A) It always acts in the direction of motion
  B) It causes wear and tear in car tyres
  C) It depends on the nature of the surfaces in contact
  D) It is independent of the area of the surfaces in contact.
  E) It reduces the efficiency of the machine
  Show Answer
  The correct answer is A.
• Question 314: The space surrounding a magnet in which the magnetic force is exerted is Options:
  A) magnetic field
  B) magnetic flux
  C) magnetic point
  D) magnetic pole
  E) magnetic strength
  Show Answer
  The correct answer is A.
• Question 315: Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33) Options:
  A) 36.9°
  B) 41.3°
  C) 48.8°
  D) 49.2°
  E) 51.4°
  Show Answer
  The correct answer is C.
• Question 316: A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the Options:
  A) charges generated by friction in the tanker are conducted to the earth
  B) chain vibrates in resonance with the tanker’s engine
  C) heat generated by friction in the engine is conducted to the earth
  D) petrol tanker is balanced on the road
  E) tanker does not exceed a certain speed limit
  Show Answer
  The correct answer is A.
• Question 317: A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary? Options:
  A) 232
  B) 450
  C) 550
  D) 2750
  E) 11000
  Show Answer
  The correct answer is D.
• Question 318:

  A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.

  Options:
  A) 125 kgms^-1
  B) 75 kgms^-1
  C) 25 kgms^-1
  D) 20 kgms^-1
  E) 5 kgms^-1
  Show Answer
  The correct answer is C.
• Question 319:

  A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g=10ms^-2)

  Options:
  A) 25ms^-1
  B) 40 ms^-1
  C) 55 ms^-1
  D) 65ms^-1
  E) 80 ms^-1
  Show Answer
  The correct answer is B.
• Question 320: The S.l unit of magnetic flux density is Options:
  A) farad
  B) henry
  C) kgm^-3
  D) tesla
  E) weber
  Show Answer
  The correct answer is D.