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 471: Which of the following is NOT directly associated with direct current (DC)? Options:
  A) A dry cell
  B) a moving coil galvanometer
  C) a transformer
  D) a lead- acid accumulator
  E) a commutator
  Show Answer
  The correct answer is C .
• Question 472: Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then Options:
  A) A and B are equal
  B) A is greater than B
  C) the angle between A and B is 0°
  D) the angle between A and B is 90°
  E) the angle between A and B is 180°
  Show Answer
  The correct answer is E .
• Question 473: Tea pots are often silver-coated to prevent heat loss by Options:
  A) conduction only
  B) convention only
  C) convection and conduction
  D) radiation only
  Show Answer
  The correct answer is D .
• Question 474: A 5-v battery is connected across the plates of a 2.0$\mu$F uncharged parallel plate capacitor. The charge on the capacitor after a long time is Options:
  A) 2.5$\mu$C
  B) 10.0$\mu$C
  C) 20.0$\mu$C
  D) 50.0$\mu$C
  Show Answer
  The correct answer is B .
• Question 475:
  

  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 476: A galvanometer of resistance 5.0W has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of Options:
  A) $\frac{5}{9}$$\mathrm{\Omega }$ in parallel
  B) $\frac{9}{5}$$\mathrm{\Omega }$ in series
  C) 45$\mathrm{\Omega }$ in parallel
  D) 45$\mathrm{\Omega }$ in series
  E) $\frac{9}{5}$$\mathrm{\Omega }$ in parallel
  Show Answer
  The correct answer is E .
• Question 477: The fundamental frequency of vibration of a sonometer wire may be halved by Options:
  A) doubling the length of the wire
  B) doubling the mass of the wire
  C) reducing the tension by half
  D) reducing the absolute temperature by half
  Show Answer
  The correct answer is A .
• Question 478:

  A train of mass 1600 kg attains a speed of 25 ms${}^{-1}$ in 20 seconds. The power developed in the engine is?

  Options:
  A) 2.5 KW
  B) 80 KW
  C) 25 KW
  D) 50 KW
  Show Answer
  The correct answer is D .
• Question 479: If two parallel conductors carry currents flowing in the same direction, the conducts will Options:
  A) attract each other
  B) repel each other
  C) both move in the same direction
  D) have no effect on each other
  Show Answer
  The correct answer is A .
• Question 480:

  

  The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are

  Options:
  A) North - North
  B) North - South
  C) South - North
  D) South - South
  Show Answer
  The correct answer is B .