1. Which type of wire is commonly used as the resistance wire in a potentiometer?
A.
A long uniform resistance wire
B.
A very short copper wire
C.
An insulated rubber strip
D.
A thick silver rod
Correct Answer:
A long uniform resistance wire
Explanation:
A potentiometer is constructed using a long, uniform resistance wire so that its resistance is evenly distributed along its length.
2. What is the main purpose of using a uniform wire in a potentiometer?
A.
To produce a uniform potential gradient
B.
To increase the brightness of the bulb
C.
To reduce the length of the wire
D.
To prevent current from flowing
Correct Answer:
To produce a uniform potential gradient
Explanation:
A uniform wire has the same resistance per unit length, which helps produce a uniform potential gradient along the potentiometer wire.
3. Which instrument is used to make sliding contact with the potentiometer wire?
A.
Jockey
B.
Ammeter
C.
Voltmeter
D.
Transformer
Correct Answer:
Jockey
Explanation:
A jockey is a movable contact that touches different points on the potentiometer wire during construction and use.
4. Which component is connected in series with the potentiometer wire to control the current?
A.
Rheostat
B.
Capacitor
C.
Galvanometer
D.
Voltmeter
Correct Answer:
Rheostat
Explanation:
A rheostat is included in the primary circuit of a potentiometer to adjust and control the current through the resistance wire.
5. Which source provides current to the potentiometer wire in its primary circuit?
A.
Battery
B.
Galvanometer
C.
Jockey
D.
Resistance box only
Correct Answer:
Battery
Explanation:
A battery supplies the current that passes through the potentiometer wire in the primary circuit.
6. What is the function of the galvanometer in a potentiometer arrangement?
A.
To detect the presence of current in the secondary circuit
B.
To supply current to the main wire
C.
To increase the resistance of the wire
D.
To measure the length of the wire
Correct Answer:
To detect the presence of current in the secondary circuit
Explanation:
The galvanometer is connected in the secondary circuit and detects whether current flows when the jockey touches the wire.
7. The resistance wire of a potentiometer is generally stretched along a:
A.
Metre scale
B.
Glass beaker
C.
Magnetic compass
D.
Wooden battery case
Correct Answer:
Metre scale
Explanation:
The long resistance wire is usually mounted along a metre scale so that positions and lengths of the wire can be measured easily.
8. Which device is used to open or close the primary circuit of a potentiometer?
A.
Plug key
B.
Jockey
C.
Galvanometer
D.
Resistance wire
Correct Answer:
Plug key
Explanation:
A plug key is used to connect or disconnect the battery from the primary circuit of the potentiometer.
9. In a standard potentiometer, the resistance wire is usually made from:
A.
Constantan
B.
Aluminium foil
C.
Plastic fibre
D.
Pure gold sheet
Correct Answer:
Constantan
Explanation:
Constantan is commonly used for the potentiometer wire because it has relatively high and stable resistance.
10. Which arrangement correctly describes the primary circuit of a potentiometer?
A.
Battery, key, rheostat, and resistance wire in series
B.
Galvanometer, jockey, and voltmeter in parallel only
C.
Battery and voltmeter connected without the resistance wire
D.
Jockey and rheostat connected without a battery
Correct Answer:
Battery, key, rheostat, and resistance wire in series
Explanation:
The primary circuit is constructed with a battery, key, rheostat, and potentiometer resistance wire connected in series.
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