Physics Past Questions

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A semiconductor diode is used in rectifying alternating current into direct current mainly because it

A. allows current to flow in either direction
B. is non-linear
C. offers a high input resistance
D. allows current to flow only in one direction

View Answer & Discuss (5) JAMB 1999

if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆P_x is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

A. ∆x ∆P_x ≥ h
B. ∆x ∆P_x = 0
C. ∆x ∆P_x < h
D. ∆x ∆P_x = ∞

View Answer & Discuss (15) JAMB 1999

When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will

A. increase
B. decrease
C. remain the same
D. increase then decrease

View Answer & Discuss (44) JAMB 2000

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I. Its velocity is constant
II. No work is done on the body
III. It has constant acceleration directed away from the centre
IV. The centripetal force is directed towards the centre

Which combination of the above is true of a body moving with constant speed in a circular track?