Jamb Physics 2019 Past Questions and Answers

Question 26:

• JAMB 2019

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

A. 0.46N
B. 0.35N
C. 0.36N
D. 0,24N

Question 27:

• JAMB 2019

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

A. 400
B. 300
C. 200
D. 150

Question 28:

• JAMB 2019

When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is

A. Upward
B. North
C. South
D. West

Question 29:

• JAMB 2019

Aluminium is sometimes used as the leaf of an electroscope because it

A. Is a light material
B. Is a good conductor
C. Is a good insulator
D. Can be converted into thin sheets

Question 30:

• JAMB 2019

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

A. At J, the wire becomes plastic
B. J is the yield point
C. L is the elastic limit
D. At K, the wire breaks