JAMB Physics 1979 Past Questions

Practice each question, then open it to see the full details.

Question 0
Which of the following statements defines correctly the efficiency of a machine?
  • 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
Objective
Question 0
Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?
  • A.the polished vessel will cool faster because a polished surface is a good radiator
  • B.the polished vessel will cool faster because it will absorbe less heat from the room
  • C.the black vessel will cool faster because it is a better conductor of heat
  • D.the polished vesselwill cool faster because it reflects heat better
  • E.the black vessel will cool faster because a black surface radiates heat faster than a polished one
Objective
Question 0
Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?
  • A.the thick tumbler is less likely to crack because it is stronger
  • B.the thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
  • C.Both tumblers are equally likely to crack because they are made of the same kind of glass
  • D.the thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
  • E.the thick tumbler is more likely to crack because it is heavier
Objective
Question 0Question image
Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?
  • A.The wire will experience a force in the direction into the paper
  • B.The wire will experience a force in the direction out of the paper
  • C.The wire will vibrate in a direction into and out of the paper
  • D.the wire will move in the direction of the field i.e toward the s-pole
  • E.the wire will not move because it is made of copper which is non magnetic
Objective