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 341: An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is Options:
  A) 80.0W
  B) 40.0W
  C) 10.0W
  D) 0.1W
  Show Answer
  The correct answer is A .
• Question 342:
  

  Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg

  [Take g = 9.8 ms-2]

  Options:
  A) $T_1$ = 2864 N, $T_2$= 3612 N
  B) $T_1$= 3612 N, $T_2$ = 2864 N
  C) $T_1$= 3502 N, $T_2$= 2760 N
  D) $T_1$ = 2760 N, $T_2$ = 3502 N
  Show Answer
  The correct answer is C .
• Question 343: What is the relative permitivity of a capacitor if its capacitance with a medium as dielectric is 16 farads and its capacitance with vacuum as dielectric is 2 farads? Options:
  A) o
  B) $\frac{1}{2}$
  C) 2
  D) 8
  E) 32
  Show Answer
  The correct answer is D .
• Question 344: If the capacitance of an capacitor is C = (εA)/d, which of the following parameters is varied when a variable capacitors is used for tuning radio sets? Options:
  A) constant (ε) and area
  B) area and distance.
  C) constant (ε) only
  D) distance only
  Show Answer
  The correct answer is B .
• Question 345: Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced. Options:
  A) 1 : 4
  B) 2 : 1
  C) 2 : 3
  D) 2 : 5
  Show Answer
  The correct answer is C .
• Question 346:

  The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

  Options:
  A) 400
  B) 300
  C) 200
  D) 150
  Show Answer
  The correct answer is C .
• Question 347:

  When two objects A and B are supplied with the same quantity of heat, the temperature change in A is obtained to be twice that of B. The mass of P is half that of Q. The ratio of the specific heat capacity of A to B is

  Options:
  A) 1 : 4
  B) 4 : 1
  C) 1 : 1
  D) 2 : 1
  Show Answer
  The correct answer is C .
• Question 348:

  The inner diameter of a test tube can be measured accurately using a?

  Options:
  A) micrometer screw gauge
  B) pair of dividers
  C) meter rule
  D) pair of vernier calipers
  Show Answer
  The correct answer is D .
• Question 349:

  One of the following readings represents the measurement of thelength of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is

  Options:
  A) 5.16cm
  B) 5.165cm
  C) 5.0cm
  D) 5.160cm
  Show Answer
  The correct answer is A .
• Question 350: A vapour is said to be saturated when Options:
  A) more molecules return to the liquid than the amount that left it
  B) a dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
  C) the vapour pressure is equal to the atmospheric pressure
  D) all molecules are moving with the same speed in all directions at a given temperature
  Show Answer
  The correct answer is B .