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 1761: In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is Options:
  A) 4m²
  B) 8m²
  C) 2m²
  D) 1m²
  Show Answer
  The correct answer is A .
• Question 1762: A thin aluminum plate has a surface area of 1500m at 20^oC. What will be its surface area when it is cooled to -20^oC? (Take the linear expansivity of aluminum to be 2.5 x 10^-5k^-1). Options:
  A) 1.503m²
  B) 1.500m²
  C) 1.498m²
  D) 1.497m²
  E) 1.490m²
  Show Answer
  The correct answer is C .
• Question 1763: A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days? Options:
  A) (1)/32
  B) (1)/16
  C) (1)/ 8
  D) (1)/4
  Show Answer
  The correct answer is B .
• Question 1764: Which of the following consists entirely of vector quantities? Options:
  A) Velocity, magnetic fulx and reaction
  B) Tension, magnetic flux and mass
  C) Displacement, impulse and power
  D) Work, pressure and moment
  Show Answer
  The correct answer is A .
• Question 1765:

  Convex mirrors are used as driving mirrors because images formed are

  Options:
  A) erect, Virtual and diminished
  B) erect, real and diminished
  C) erect, virtual and magnified
  D) inverted, virtual and diminished
  Show Answer
  The correct answer is A .
• Question 1766: A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block. Options:
  A) 450ms^-1
  B) 400ms^-1
  C) 300ms^-1
  D) 250ms^-1
  Show Answer
  The correct answer is C .
• Question 1767: Which of the following instruments can be used to measure current in an a.c circuit? Options:
  A) Hot wire ammeter
  B) Moving coil ammeter
  C) Tangent galvanometer
  D) Moving coil galvanometer
  Show Answer
  The correct answer is D .
• Question 1768: Pure silicon can be converted to a p-type by adding a controlled amount of Options:
  A) trivalent atoms
  B) tetravalent atoms
  C) pentavalent atoms
  D) hexavalent atoms
  Show Answer
  The correct answer is A .
• Question 1769: Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P₁ while the pressure on H is P₂. If the atmospheric pressure is equivalent to 10m of water, then the value of $\frac{p_2}{p_1}$ is Options:
  A) 0.50
  B) 0.60
  C) 1.67
  D) 2.00
  E) 3.0
  Show Answer
  The correct answer is D .
• Question 1770: The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is Options:
  A) 1:80
  B) 1:320
  C) 1:1280
  D) 1:4
  Show Answer
  The correct answer is A .