Jamb Physics 2001 Past Questions and Answers

Question 46:

• JAMB 2001

In the circuit diagram above , the ammeter reads a current of 3A when R is 5Ω and 6A when R is 2Ω. Determine the value of x

A. 8Ω
B. 2Ω
C. 10Ω
D. 4Ω

Question 47:

• JAMB 2001

In the diagram above, determine the r.m.s current

A. 31A
B. 48A
C. 60A
D. 80A

Question 48:

• JAMB 2001

Find the frequencies of the first three harmonics of a piano string of length 1.5m, if the velocity of the wave on the string is 120ms^-1

A. 40Hz, 80Hz, 120Hz
B. 80Hz, 160Hz, 240Hz
C. 180Hz, 360Hz, 540Hz
D. 369Hz, 180Hz, 90Hz

Question 49:

• JAMB 2001

A bread toaster uses a current of 4A when plugged in a 24oV line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster

A. 5.76 x 10⁴J
B. 1.60 x 10⁴J
C. 3.60 x 10³J
D. 1.60 x 10²J