Question:
Which of the following cells is used in hearing aids?
Which of the following cells is used in hearing aids?
Show Hint
Mercury cells are used in hearing aids, watches, and calculators due to their stable voltage and compact size.
Updated On: Feb 17, 2025
- Dry cell
- Mercury cell
- Nickel-cadmium cell
- Fuel cell
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Mercury cells are commonly used in hearing aids because they provide a stable and long-lasting voltage. They operate based on the reaction:
\[
\text{Zn} + \text{HgO} \rightarrow \text{ZnO} + \text{Hg}
\]
These cells have a small size and deliver a constant potential, making them ideal for sensitive electronic devices like hearing aids.
Was this answer helpful?
0
0
Top Questions on Electrochemistry
- Explain in brief the Faraday's laws of Electrolysis. CuSO$_4$ solution was electrolysed for 20 minutes with 2.0 ampere current. What will be the mass of precipitated copper at cathode?
- UP Board XII - 2025
- Chemistry
- Electrochemistry
- A cell in which the following reaction occurs:
\[ \text{Zn}_{(s)} + \text{Cu}^{2+}_{(aq)} \rightarrow \text{Zn}^{2+}_{(aq)} + \text{Cu}_{(s)} \] has standard electrode potential \(E^\circ_{\text{cell}} = 1.1~\text{V}\) at \(298~\text{K}\). Calculate the standard Gibbs energy and the equilibrium constant of the cell reaction.- UP Board XII - 2025
- Chemistry
- Electrochemistry
- Explain Kohlrausch Law. Limiting molar conductances (\( \lambda^0 \)) of \( \text{Ca}^{2+} \) and \( \text{Cl}^- \) ions in water at 298 K are 119.0 S cm\(^2\) mol\(^{-1}\) and 76.3 S cm\(^2\) mol\(^{-1}\) respectively. Calculate \( \lambda^0_m \) of \( \text{CaCl}_2 \).
- UP Board XII - 2025
- Chemistry
- Electrochemistry
- Why do the conductivity of a solution decreases with dilution? Explain with reason.
- UP Board XII - 2025
- Chemistry
- Electrochemistry
- The resistance of a column formed by a 0.10 mol L^{-1} concentrated solution is 6.5 × 10^3 ohm. Its diameter is 1 cm and length is 50 cm. Calculate its resistivity, conductivity and molar conductivity.
- UP Board XII - 2025
- Chemistry
- Electrochemistry
View More Questions
Questions Asked in CBSE CLASS XII exam
- Explain the following observations using Einstein’s photoelectric equation:
(a) Photoelectric emission does not occur from a surface when the frequency of the light incident on it is less than a certain minimum value.
(b) It is the frequency, and not the intensity of the incident light which affects the maximum kinetic energy of the photoelectrons.
(c) The cut-off voltage \( V_0 \) versus frequency \( \nu \) of the incident light curve is a straight line with a slope \( \frac{h}{e} \).
- CBSE CLASS XII - 2025
- Photoelectric Effect
- In the figure, curved lines represent equipotential surfaces. A charge \( Q \) is moved along different paths A, B, C, and D. The work done on the charge will be maximum along the path:
- CBSE CLASS XII - 2025
- Electrostatics
- Three batteries E1, E2, and E3 of emfs and internal resistances (4 V, 2 \(\Omega\)), (2 V, 4 \(\Omega\)) and (6 V, 2 \(\Omega\)) respectively are connected as shown in the figure. Find the values of the currents passing through batteries E1, E2, and E3.
- CBSE CLASS XII - 2025
- Kirchhoff's Laws
- (a)(i) "To promote the green revolution, the Indian government provided fertilizer subsidies to the farmers." Briefly explain any two arguments in favour of such subsidies.
- CBSE CLASS XII - 2025
- Indian Economy
- How did Franz plan to turn the commotion in the classroom to his favour?
- CBSE CLASS XII - 2025
- Literature
View More Questions