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 391:

  I. Increase the melting point of the liquid.

  II. Increase the boiling point of the liquid.

  III. Decrease the melting point of the liquid.

  IV. Decrease the boiling point of the liquid.

  Which of the statement above about the effect on increase in pressure in a liquid are correct?

  Options:
  A) I and II only
  B) I and III only
  C) II and III only
  D) III and IV only
  Show Answer
  The correct answer is C .
• Question 392: The electrochemical equivalent of platinum is 5.0 x 10^-7kgC^-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for Options:
  A) 5.6 hours
  B) 56 hours
  C) 1.4 x 10^{4 hours}
  D) 2.0 x 10^{4 hours}
  Show Answer
  The correct answer is A .
• Question 393:

  ²³₁₁Na + Proton → ^p_qX + alpha particle

  What are the values of p and q respectively in the equation above?

  Options:
  A) 10 and 20
  B) 12 and 24
  C) 20 and 10
  D) 24 and 12
  Show Answer
  The correct answer is C .
• Question 394: A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called Options:
  A) condensation
  B) sublimation
  C) regelation
  D) fusion
  Show Answer
  The correct answer is C .
• Question 395:

  Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;

  Specific heat capacity of copper = 400JKg^-1K^-1

  Latent heat of fusion of ice = 3.3 x 10⁵JKg^-1

  Options:
  A) 8/33kg
  B) 33/80kg
  C) 80/33kg
  D) 33/8kg
  Show Answer
  The correct answer is A .
• Question 396: The bond between silicon and germanium is Options:
  A) dative
  B) covalent bond
  C) trivalent
  D) ionic
  Show Answer
  The correct answer is B .
• Question 397: How many grams of water at 17^oC must be added to 42g of ice at 0^oC to melt the ice completely? [specific latent heat of fusion of ice = 3.4 x 10⁵Jkg^-1, specific heat capacity of water = 4200Jkg^-1k^-1] Options:
  A) 200g
  B) 300g
  C) 320g
  D) 400g
  Show Answer
  The correct answer is A .
• Question 398: An electric iron is rated 1000W, 230V. What is the resistance of its elements? Options:
  A) 51.9Ω
  B) 52.9Ω
  C) 55.9Ω
  D) 57.6Ω
  Show Answer
  The correct answer is B .
• Question 399:

  

  Each of the figures in the diagram above represent two current carrying conductors situated close to each other. In which two diagrams, are the forces between the two wires attractive

  Options:
  A) I and V
  B) I and II
  C) II and IV
  D) II and V
  E) III and IV
  Show Answer
  The correct answer is C .
• Question 400: Two liquids L₁ and L₂ are contained in a U - tube. The height and the density of L₁ are 8 cm and 10³ kgm^-3 respectively. If the density of L₂ is 800 kgm^-3, its height measured from the same level is Options:
  A) 8 cm
  B) 10 cm
  C) 16 cm
  D) 12 cm
  Show Answer
  The correct answer is B .