1. Which type of wire is commonly used as the long wire in a potentiometer?
A.
Uniform resistance wire
B.
Thick copper wire
C.
Insulated aluminium wire
D.
Superconducting wire
Correct Answer:
Uniform resistance wire
Explanation:
A potentiometer uses a long, uniform resistance wire so that its resistance is distributed evenly along its length.
2. What is the function of the jockey in a potentiometer?
A.
To slide over the wire and make contact at different points
B.
To supply current to the circuit
C.
To change the resistance of the battery
D.
To measure the temperature of the wire
Correct Answer:
To slide over the wire and make contact at different points
Explanation:
The jockey is a sliding contact used to touch different positions on the potentiometer wire.
3. Which component is connected in series with the potentiometer wire to control the current?
A.
Rheostat
B.
Voltmeter
C.
Capacitor
D.
Transformer
Correct Answer:
Rheostat
Explanation:
A rheostat is connected in the primary circuit to adjust and limit the current through the potentiometer wire.
4. Which instrument detects the presence and direction of a small current in a potentiometer circuit?
A.
Galvanometer
B.
Ammeter
C.
Voltmeter
D.
Barometer
Correct Answer:
Galvanometer
Explanation:
A galvanometer is connected with the jockey to detect small currents in the secondary circuit.
5. The potentiometer wire is usually mounted on an insulating board to provide what feature?
A.
Mechanical support and electrical insulation
B.
Extra current generation
C.
Permanent magnetisation
D.
Increase in battery voltage
Correct Answer:
Mechanical support and electrical insulation
Explanation:
The insulating board supports the wire and prevents unwanted electrical contact with the surroundings.
6. Which source is generally used to drive current through the potentiometer wire?
A.
Battery or cell arrangement
B.
Galvanometer
C.
Jockey
D.
Switch alone
Correct Answer:
Battery or cell arrangement
Explanation:
A battery or group of cells supplies current to the potentiometer wire in the primary circuit.
7. What is the purpose of a key or switch in the primary circuit of a potentiometer?
A.
To open or close the circuit
B.
To measure the length of the wire
C.
To increase the thickness of the wire
D.
To detect null deflection
Correct Answer:
To open or close the circuit
Explanation:
The key controls the connection of the battery to the potentiometer circuit by opening or closing the circuit.
8. Which property of the potentiometer wire is important for its construction?
A.
It should have uniform thickness
B.
It should be made of glass
C.
It should have zero length
D.
It should be completely nonconducting
Correct Answer:
It should have uniform thickness
Explanation:
A wire of uniform thickness has uniform resistance per unit length, which is required in a properly constructed potentiometer.
9. In a standard potentiometer, the long resistance wire is connected between which terminals?
A.
The two ends of the primary circuit
B.
The two terminals of the galvanometer only
C.
The positive and negative terminals of the voltmeter
D.
The two ends of the jockey
Correct Answer:
The two ends of the primary circuit
Explanation:
The potentiometer wire forms the main part of the primary circuit and is connected across the supply terminals.
10. Which component is used to make a movable electrical contact with the potentiometer wire?
A.
Jockey
B.
Rheostat
C.
Plug key
D.
Battery
Correct Answer:
Jockey
Explanation:
The jockey has a pointed contact that can be moved along the wire to establish electrical contact at selected points.
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