Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?

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Q: 112 (IAS/1995)
Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,70,68,70,28,35,5

keywords: 

{'electrodes': [0, 1, 0, 0], 'chargeable batteries': [0, 1, 0, 0], 'electric shavers': [0, 1, 0, 0], 'lead peroxide': [0, 1, 0, 0], 'cadmium': [1, 0, 0, 0], 'zinc': [1, 0, 0, 2], 'materials': [0, 1, 1, 0], 'nickel': [1, 0, 0, 0], 'carbon': [1, 0, 4, 5], 'devices': [0, 1, 0, 7], 'torchlights': [0, 1, 0, 0]}

The correct answer is option 1: Nickel and cadmium. These two materials are used as electrodes in rechargeable batteries, more specifically known as Ni-Cd (Nickel Cadmium) batteries. These are widely used in portable devices like torchlights and electric shavers due to their ability to produce a constant output voltage throughout their discharge cycle.

Option 2: Zinc and carbon - these are often used in non-rechargeable, or primary batteries such as zinc-carbon or zinc-chloride batteries, cannot be recharged once drained.

Option 3: Lead peroxide and lead - these are the electrodes of a lead-acid battery, usually used in cars, UPS systems, and other heavy-duty applications. These batteries are rechargeable but are less common in small devices.

Option 4: Iron and cadmium - This is not a common pairing for batteries. Cadmium is usually paired with Nickel (as in option 1) in rechargeable batteries, while iron isn`t typically used as a electrode in batteries.

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