Environmental Science Online Courses

Global Warming App's Tests

Global Warming e-Book's MCQs - Complete

Energy from Sun Quiz App Download & e-Book - 651

MCQ:

Why the back tube of the solar water heater is surrounded with a vaccum?

  1. To provide support
  2. to cease the leakage
  3. For insulation
  4. To enhance efficiency

More MCQs from Global Warming Textbook

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Energy from Sun App (Android & iOS)

Energy from Sun App (Android & iOS)

Global Warming App (Android & iOS)

Global Warming App (iOS & Android)

Computer Networks App (Android & iOS)

Computer Networks App (Android & iOS)

Electronic Devices App (Android & iOS)

Electronic Devices App (iOS & Android)