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This week's questions

Why does a fan make noise while running on invertor/UPS and not with direct connection to mains?

N.K. Chandrasekharan, Kottayam, Kerala

Why do solid disk heating elements take a longer time to heat up and cool down than coil type elements?

P. Gireesh, Karimnagar, Andhra Pradesh

Sometimes ice-crystals also fall along with rain. What is this phenomenon?

Abhayakumar Shah, Adoni, Andhra Pradesh

Readers can send questions/answers on science and technology for the Question Corneralong with their names and address to the following email id:
questioncorner@thehindu.co.in or to The Editor, The Hindu (Science and Technology),
859-860, Anna Salai, Chennai 600 002.

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