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 461: A boat travels due east at a speed 40ms^-1s across a river flow due south at 30ms^-1s. What is the resultant speed of the boat? Options:
  A) 1.3ms^-1
  B) 10.0ms^-1
  C) 50.0ms^-1
  D) 70.0ms^-1
  Show Answer
  The correct answer is C .
• Question 462: The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz? Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is A .
• Question 463:

  

  In the circuit above, the ammeter reads a current of 5.0 A when R = 8Ω and reads 7.0A when R = 5Ω. The value of the unknown resistance X is

  Options:
  A) 10.0Ω
  B) 7.5Ω
  C) 5.0Ω
  D) 2.5Ω
  Show Answer
  The correct answer is D .
• Question 464:

  Calculate the heat energy required to vaporize 50g of water initially at 80ºCif the specific heat capacity of water is 4.23jg${}^{-1}$k${}^{-1}$ (specific latent heat of vaporization of water is 2260jg${}^{-1}$

  Options:
  A) 530000J
  B) 23200J
  C) 17200J
  D) 130000J
  Show Answer
  The correct answer is D .
• Question 465:

  

  Two mirrors of the same length are arranged as shown above, a ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

  Options:
  A) 220 degrees
  B) 200 degrees
  C) 210 degrees
  D) 180 degrees
  E) 230 degrees
  Show Answer
  The correct answer is D .
• Question 466: 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 467: Calculate the length which corresponds to a temperature of 20^oC if the ice and steam points of an unguarded thermometer are 400 mm apart Options:
  A) 20mm
  B) 30mm
  C) 60mm
  D) 80mm
  Show Answer
  The correct answer is D .
• Question 468: What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds? Options:
  A) 80Hz
  B) 600Hz
  C) 800Hz
  D) 1600Hz
  Show Answer
  The correct answer is C .
• Question 469: A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time? Options:
  A) 200
  B) 1200
  C) 1600
  D) 2400
  Show Answer
  The correct answer is C .
• Question 470:

  I. The frictional force is independent of the area of the surfaces in conduct

  II. The frictional force depends on the nature of the surfaces in contact

  III. The frictional force depends on the speed of sliding

  IV. The frictional force is directly proportional to the normal reaction.Which combination of the above is true of sliding friction?

  Options:
  A) I, III and IV
  B) I, II and IV
  C) I, II and III
  D) II, III and IV
  Show Answer
  The correct answer is B .