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?
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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]}