Jamb Physics 2001 Past Questions and Answers

Question 16:

• JAMB 2001

A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is

A. 24cm
B. 16cm
C. 12cm
D. 8cm

Question 17:

• JAMB 2001

A gas with initial volume of 2 X 10^-6m³ is allowed to expand to six times its initial value at constant pressure of 2 x 10⁵Nm^-2. The work done is

A. 2.0J
B. 4. 0 J
C. 12.0 J
D. 2.4 J

Question 18:

• JAMB 2001

A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r.

A. 4.5Ω
B. 1.0Ω
C. 8.0Ω
D. 2.0Ω

Question 19:

• JAMB 2001

A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.
The value of R is

A. 3 Ω
B. 2 Ω
C. 1 Ω
D. 6 Ω

Question 20:

• JAMB 2001

A student is at a height 4m above the ground during a thunderstorm. Give that the potential difference between the thundercloud and the ground is 10⁷v, the electric field created by the storm is

A. 2.0 * 10⁶ NC ^-1
B. 2. 5 * 10⁶ NC ^-1
C. 1.0 * 10⁷ NC ^-1
D. 4.0 * 10⁷ NC ^-1