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 511:

  Which of the following is/areNOT affected by a magnetic field? I. Alpha particle

  II. Cathode rays

  III. Neutrons

  Options:
  A) I only
  B) II only
  C) III only
  D) I and II only
  E) I,II & III
  Show Answer
  The correct answer is C.
• Question 512: A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct? Options:
  A) The cap will be positively charged and the negatively charged leaves will diverge
  B) The cap will be negatively charged and the positively charged leaves will diverge
  C) The cap and the leaves will be positively charged
  D) The cap and the leaves will be negatively charged.
  E) The leaves will not diverge because the cap has been earthed.
  Show Answer
  The correct answer is C.
• Question 513: When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses? Options:
  A) 20.0cm
  B) 47.5cm
  C) 50.0cm
  D) 52.5cm
  E) 125.0cm.
  Show Answer
  The correct answer is D.
• Question 514: A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air. Options:
  A) 170 ms-1
  B) 340 ms-1
  C) 680 ms-1
  D) 765 ms-1
  E) 1530 ms-1
  Show Answer
  The correct answer is B.
• Question 515: The half-life of a radioactive substance is 2 seconds. Calculate the decay constant. Options:
  A) 2.890 s^-1
  B) 1 .445 s^-1
  C) 0.576 s^-1
  D) 0.347s^-1
  E) 0.152 s^-1
  Show Answer
  The correct answer is D.
• Question 516: The half-life of a radioactive substance is 2 seconds. Calculate the decay constant Options:
  A) 0.035s^-1
  B) 0.151s^-1
  C) 0.347s^-1
  D) 0.576s^-1
  E) 1.386s^-1
  Show Answer
  The correct answer is C.
• Question 517: A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air Options:
  A) 540.0ms^-1
  B) 333.3ms^-1
  C) 270.0ms^-1
  D) 166.7ms^-1
  E) 83.3ms^-1
  Show Answer
  The correct answer is B.
• Question 518:

  Which of the following is/are TRUE of nuclear fission? I. A heavy nucleus is split into two nuclei of comparable masses

  II. Two light nuclei are joined together to form a heavier nucleus

  III. The total mass of the products is less than that of the reactants

  Options:
  A) I only
  B) II only
  C) III only
  D) I and III only
  E) II and III only
  Show Answer
  The correct answer is D.
• Question 519: Which of the following pairs of light rays shows the widest separation in the spectrum of white light? Options:
  A) Red and blue
  B) Orange and green
  C) Red and indigo
  D) Violet and green
  E) Yellow and red
  Show Answer
  The correct answer is C.
• Question 520: To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is Options:
  A) $\frac{1}{2}$v
  B) pv
  C) $\frac{p}{v}$
  D) pv²
  E) $\frac{p}{v^2}$
  Show Answer
  The correct answer is C.