Ohm's law - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1979

The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is

A. \(\frac{6^2}{40^2}\)ohms
B. \(\frac{40}{6^2}\)ohms
C. \(\frac{40}{6}\)ohms
D. 6 x 40 ohms
E. \(\frac{6^2}{40}\)ohms

Question 3:

• JAMB 1980

According to Ohm's law, the ratio V/I is constant for

A. An electrolyte
B. A diode
C. A transistor
D. Silver
E. All of the above

Question 4:

• JAMB 1981

The resistance of a 240V, 60 watt electric filament bulb is

A. 0.25\(\Omega\)
B. 480\(\Omega\)
C. 60\(\Omega\)
D. 240\(\Omega\)
E. 960\(\Omega\)

Question 5:

• JAMB 1982

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

A. 62.5A, 4.0\(\Omega\)
B. 16.0A, 62.5\(\Omega\)
C. 62.5A, 16.0\(\Omega\)
D. 4.0A, 62.5\(\Omega\)
E. 4.0A, 250\(\Omega\)