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 41: The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because Options:
  A) atmospheric pressure acts on the surface of the lake
  B) pressure increases with depth
  C) density remains constant with pressure
  D) the bubble experiences an upthrust
  Show Answer
  The correct answer is B .
• Question 42:

  

  In the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X

  Options:
  A) 15 cm³
  B) 25 cm³
  C) 35 cm³
  D) 45 cm³
  Show Answer
  The correct answer is B .
• Question 43: A platinum resistance thermometer wire has a resistance of 70hms at 0°Cand 7.5 Ohms at 100°C. Calculate the temperature of the wire when the resistance is 7.2 Ohms Options:
  A) 15°C
  B) 40°C
  C) 20°C
  D) 10°C
  Show Answer
  The correct answer is B .
• Question 44: A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10^-6K^-1? Options:
  A) 2.0036m
  B) 2.0018cm
  C) 2.1800
  D) 2.0360m
  Show Answer
  The correct answer is A .
• Question 45:

  The velocities of light in air and glass are 3.0 x 10${}^8$ms${}^{-1}$ and 2.0 x 10${}^8$ms${}^{-1}$ respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

  Options:
  A) 0.33
  B) 0.50
  C) 0.67
  D) 0.75
  Show Answer
  The correct answer is D .
• Question 46: A thermometer with an arbitrary scale S, of equal division registers -30^oS at the ice point and +90^oS at the steam point. Calculate the Celsius temperature corresponding to 60^oS Options:
  A) 25.0^oC
  B) 50.0^oC
  C) 66.7^oC
  D) 75.0^oC
  Show Answer
  The correct answer is D .
• Question 47:

  

  In the Fig above, MN is a light uniform meter rule pivoted at O, the 80cm mark. A load of mass 3.0 kg is suspended on the meter rule at L, the 10cm mark. If the rule is kept in equilibrium by a string RP, fixed at P and attached to the rule at R, the 20cm mark, then the Tension T on the string is

  Options:
  A) 30N
  B) 34N
  C) 35N
  D) 60N
  E) 70N
  Show Answer
  The correct answer is E .
• Question 48:

  One of the features of the fission process is that

  Options:
  A) it leads to chain reaction
  B) its products are not radioactive
  C) neutrons are not released
  D) the of the masses of the reactants equals the sum of the masses of the products
  Show Answer
  The correct answer is A .
• Question 49:

  A person standing waist-deep in a swimming pool appears to have short legs because of light?

  Options:
  A) diffraction
  B) refraction
  C) reflection
  D) interference
  Show Answer
  The correct answer is B .
• Question 50:

  In the formation of sea breeze, wind blows from?

  Options:
  A) sky to land
  B) sea to sky
  C) land to sea
  D) sea to land
  Show Answer
  The correct answer is D .