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 981: In a Daniel cell, the depolarizer, positive and negative electrodes are respectively Options:
  A) copper sulphate, copper and zinc
  B) manganese dioxide, carbon and zinc
  C) sulphuric acid, lead oxide and lead
  D) potassium hydroxide, nickel and iron.
  Show Answer
  The correct answer is A .
• Question 982: The factional force between two bodies Options:
  A) exists only when there is relative motion or tendency for motion
  B) acts so as to oppose the motion
  C) depends on the normal reaction between the two surfaces
  D) is relatively independent of the area in contact
  E) has all of these characteristics
  Show Answer
  The correct answer is E .
• Question 983: In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will Options:
  A) pass through undeviated
  B) pass through the center of curvature after refraction
  C) emerge parallel to the principal axis
  D) pass through the principal focus after refraction
  Show Answer
  The correct answer is A .
• Question 984:

  Which expression gives magnetic flux?

  Options:
  A) qVB sin$\theta$
  B) $\frac{\mu \varphi I}{2\pi r}$
  C) BA cos $\theta$
  D) -N $\frac{d\varphi }{dt}$
  Show Answer
  The correct answer is C .
• Question 985: Which of the following statements is NOT correct? Options:
  A) The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
  B) Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
  C) Shortsighted people cannot accommodate distant objects
  D) Longsighted people need diverging spectacle lenses
  E) A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina
  Show Answer
  The correct answer is D .
• Question 986: A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the center of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is Options:
  A) 15N
  B) 20N
  C) 30N
  D) 60N
  Show Answer
  The correct answer is B .
• Question 987: The photocell works on the principle of the Options:
  A) voltaic cell
  B) emision of electrons by incident radiation
  C) emision of protons by incident electrons
  D) photographic plate
  Show Answer
  The correct answer is B .
• Question 988:

  A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is

  Options:
  A) 5 volts
  B) 10 volts
  C) 15 volts
  D) 20 volts
  Show Answer
  The correct answer is B .
• Question 989: Boiling occurs when the vapour pressure of a liquid is Options:
  A) At the evaporation point
  B) Less than the atmospheric pressure
  C) Greater than the atmospheric pressure
  D) Equal to the atmospheric pressure
  Show Answer
  The correct answer is D .
• Question 990: The activity of a radioactive substance depends on Options:
  A) temperature and purity
  B) temperature and age
  C) purity and age
  D) age, purity and temperature
  E) none of the above
  Show Answer
  The correct answer is E .