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5/10 MCQs for:

ELECTRICITY: Current

In the comparison of heat and electrical energy flowing along a well insulated conductor which of these is/are true?

1) The Pd across the ends of the conductor is analogous to the temperature difference between the ends of the conductor.

2) The electric current is analogous to the rate of flow of heat.

3) The electrical resistance is analogous to the of thermal conductivity.

If 2 and 3 are correct.

If 1 only is correct.

If 1 and 2 are correct.

If 3 only is correct.

The value of X for which the galvanometer in the figure shows a null deflection is:

1Ω.

4.5 Ω.

8Ω.

4Ω.

Which of the following statements describes an electric generator?

Forces from a permanent magnet allow a coil of wire to rotate.

An electrical current causes a coil of wire to rotate in a magnetic field.

A coil of wire is rotated through a strong magnetic field to produce an electric current.

Electric potential in a rotating coil of a wire creates a temporary magnet.

The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.

The ammeter is connected as shown because it has:

A very high resistance and so allows little current to flow through it.

Very low resistance and so alters the current flowing through it.

Very high resistance and so allows high current to flow through it.

Very low resistance and so does not alter the current flowing through it.

The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X. The most likely shape of the graph of the potential difference (Y) against current (X) for the copper wire is: