Carry Foster's Bridge
1. Why is a Leclanché cell used in Carey Foster’s bridge experiments?
- Because it creates alternating current for bridges
- Because it charges faster than other cells
- Because it can store high voltage for long durations
- Because it provides a steady and low current suitable for sensitive resistance measurements.
2. Why is a battery cell not preferred over Leclanché cell in this experiment?
- Because they only work with alternating current
- Because they are not available in laboratories
- Because they cannot power any circuit
- Because battery cells may produce fluctuating or higher currents, affecting precision in bridge balance.
3. What is the principle behind the Wheatstone bridge?
- It depends on chemical changes in resistance
- It works on the principle of null deflection where the ratio of resistances in two arms is equal.
- It uses alternating current and phase difference
- It measures voltage drops across resistors
4. What is specific resistance (resistivity)?
- It is the resistance offered by a material of unit length and unit cross-sectional area.
- It is resistance divided by length
- It is the resistance between two poles
- It is the resistance of only metallic wires
5. What does the Carey Foster's bridge measure precisely?
- It measures voltage fluctuations in AC circuits
- It is used to measure small differences in resistance accurately.
- It measures frequency in oscillator circuits
- It determines capacitance in dielectric materials
6. Which principle does the Carey Foster’s bridge follow?
- It is based on the Wheatstone bridge principle using a slide wire to find resistance difference.
- It is based on the principle of electromagnetic induction
- It uses the principle of mutual inductance
- It is based on the internal resistance of a battery
7. What is the main electrolyte used in a Leclanché cell?
- Ammonium chloride (NH₄Cl)
- Sodium chloride
- Zinc sulfate
- Potassium nitrate
8. Which component in the Leclanché cell acts as the cathode?
- Ammonium chloride
- Copper wire
- Zinc rod
- Manganese dioxide (MnO₂)
9. What are the two main components of a Leclanché cell?
- Zinc (anode) and manganese dioxide with carbon (cathode)
- Copper and iron
- Graphite and potassium
- Lead and sulfuric acid
10. Can other cells be used in place of a Leclanché cell in bridge experiments?
- No, because Leclanché cells provide a stable low-voltage direct current needed for accurate bridge measurements.
- Yes, as long as the voltage is high enough
- Yes, if the cell can produce alternating current
- No, because other cells do not contain electrolytes
11. What is the purpose of using a Carey Foster’s bridge in the lab?
- To determine the unknown resistance and compare it with a standard known resistance.
- To generate electricity using thermoelectric effect
- To amplify signals in a circuit
- To measure the frequency of oscillations
12. How many types of electrical bridges are commonly studied in labs?
- Two: Series and parallel bridges
- Only one: Wheatstone bridge
- Several, including Wheatstone, Maxwell, Carey Foster’s, and Kelvin bridges.
- None, as they are outdated
