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 1631: Which of the following statements defines correctly the efficiency of a machine? Options:
  A) the load carried by the machine divided by effort required in carrying the load
  B) the distance moved by the load divided by the distance moved by the effort
  C) the useful work done by the machine divided by the total work put into the machine
  D) the movement of the load divided by the movement of the effort about the same point
  E) the temperature at the end of the application of the machine divided by the initial temperature
  Show Answer
  The correct answer is C .
• Question 1632:

  Which of these is a derived unit?

  Options:
  A) Kilogram
  B) Metre
  C) Newton
  D) Second
  Show Answer
  The correct answer is C .
• Question 1633:

  

  For what value of 6 are the forces in the diagram above in equilib4ruim

  Options:
  A) ${15}^{\circ }$
  B) ${30}^{\circ }$
  C) ${45}^{\circ }$
  D) ${60}^{\circ }$
  Show Answer
  The correct answer is D .
• Question 1634: Three resistors, with substances 250$\mathrm{\Omega }$, 500$\mathrm{\Omega }$ and 1k$\mathrm{\Omega }$ are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250$\mathrm{\Omega }$ resistor. Options:
  A) 0.20V
  B) 0.86V
  C) 1.71V
  D) 3.43V
  Show Answer
  The correct answer is B .
• Question 1635:

  

  The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is

  Options:
  A) 985 ohms
  B) 990 ohms
  C) 995 ohms
  D) 1000 ohms
  E) 1005 ohms
  Show Answer
  The correct answer is C .
• Question 1636: According to Ohm's law, the ratio V/I is constant for Options:
  A) an electrolyte
  B) a diode
  C) a transistor
  D) silver
  E) all of the above
  Show Answer
  The correct answer is D .
• Question 1637: When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is Options:
  A) $\frac{2}{1}$R
  B) $\frac{1}{2}$R
  C) $\frac{3}{2}$R
  D) 5R
  Show Answer
  The correct answer is B .
• Question 1638:

  

  In the figure above W1 = 200g, and W2 =450g . Calculate the extension of the spring per unit load? [g = 10ms^-2]

  Options:
  A) 6.0 x 10^-5mN^-1
  B) 2.5 x 10^-4mN^-1
  C) 6.0 x 10 ^-3mN^-1
  D) 2.5 x 10 ^-2mN^-1
  Show Answer
  The correct answer is C .
• Question 1639:

  A simple pendulum, has a period of 5.77 seconds. When the pendulum is shortened by 3 m, the period is 4.60 seconds. Calculate the new length of the pendulum

  Options:
  A) 5.23 m
  B) 6.42 m
  C) 4.87 m
  D) 7.26 m
  Show Answer
  The correct answer is A .
• Question 1640: An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed Options:
  A) 0.5cm
  B) 1.5cm
  C) 2.0cm
  D) 6.0cm
  Show Answer
  The correct answer is B .