Quiz for Potentiometer

Q1: Which principle does the potentiometer work on?

A. Ohm's Law B. Kirchhoff's Law C. Joule's Law D. Coulomb's Law

Q2: The potentiometer is preferred over a voltmeter because:

A. It has low sensitivity B. It does not draw any current C. It is cheaper D. It is less bulky

Q3: For which of the following measurements is the potentiometer used?

A. Current B. Resistance C. Potential difference D. Inductance

Q4: What is the balancing length in a potentiometer?

A. Length where current is maximum B. Length where potential difference is maximum C. Length where null deflection occurs D. Length of connecting wires

Q5: Which component is NOT used in a potentiometer experiment?

A. Galvanometer B. Ammeter C. Standard cell D. Jockey

Q6: The potential gradient in a potentiometer depends on:

A. Length of the wire B. Current through the wire C. Material of the wire D. Temperature

Q7: A longer potentiometer wire is preferred because:

A. It is easier to set up B. It gives greater sensitivity C. It has less resistance D. It produces more current

Q8: Which device is used to find the null point?

A. Voltmeter B. Galvanometer C. Ammeter D. Wheatstone bridge

Q9: A potentiometer wire is 10 m long. It is connected to a cell of emf 2 V. The potential gradient is:

A. 0.2 V/m B. 0.1 V/m C. 0.5 V/m D. 2 V/m

Q10: Potentiometer gives more accurate result than voltmeter because:

A. It measures higher current B. It uses less voltage C. It has low resistance D. It does not draw any current from the cell being measured

Q11: What happens if the galvanometer shows deflection on both sides during the experiment?

A. The circuit is broken B. Standard cell is dead C. Balancing point lies between the contacts D. Current is not flowing

Q12: Which factor increases the sensitivity of a potentiometer?

A. Increasing wire resistance B. Increasing current through the wire C. Using thicker wire D. Using shorter wire

Q13: To compare two emfs using a potentiometer, we use:

A. Two galvanometers B. Two batteries C. Two standard resistors D. Two cells and a two-way key

Q14: Why is the wire of uniform cross-section used in potentiometer?

A. To increase resistance B. To ensure uniform potential gradient C. To reduce cost D. To improve flexibility

Q15: What is the SI unit of potential gradient?

A. Ohm B. Volt C. Volt/meter D. Ampere/meter

Q16: In a potentiometer experiment, why is a high resistance included in series with galvanometer?

A. To protect it from high current B. To measure potential difference C. To reduce wire resistance D. To increase emf

Q17: If balancing length increases, the emf of the cell is:

A. Increased B. Decreased C. Unchanged D. Becomes zero

Q18: The potentiometer wire should be made of:

A. Iron B. Copper C. Constantan D. Silver

Q19: If the galvanometer shows no deflection at balancing point, then:

A. Current is zero in main circuit B. No current flows through galvanometer C. No emf in cell D. Wire is disconnected

Q20: To increase sensitivity of potentiometer, we should:

A. Increase length of wire B. Decrease resistance of wire C. Increase potential difference across wire D. All of the above