Which of the following are non-conventional energy resources?
(i) Solar Energy
(ii) Wind Energy
(iii) Geo-thermal Energy
(iv) Hydro-electricity
(v) Tidal Energy

Question

Which of the following are non-conventional energy resources? 
(i) Solar Energy 
(ii) Wind Energy 
(iii) Geo-thermal Energy 
(iv) Hydro-electricity 
(v) Tidal Energy

Accepted Answer

Option 4 is correct because it includes Solar Energy, Wind Energy, Geo-thermal Energy, and Tidal Energy, all of which are considered non-conventional energy resources. These resources are renewable and generally have a lower environmental impact compared to conventional sources like fossil fuels.

Here's why each of the other options is incorrect:

*   **Option 1: (i), (ii), (iii), (iv) and (v)** This option includes Hydro-electricity. While hydro-electricity is a renewable resource, large-scale hydro-electric projects are often considered *conventional* renewable energy sources due to their long history of use and significant environmental impacts (e.g., displacement of communities, alteration of river ecosystems). Non-conventional energy sources are typically newer, less established technologies.

*   **Option 2: (i), (ii), (iii) and (iv)** This option also includes Hydro-electricity, making it incorrect for the same reason as Option 1. It also excludes Tidal Energy, which is a clear example of a non-conventional energy resource.

*   **Option 3: (i), (ii), (iv) and (v)** This option includes Hydro-electricity, making it incorrect for the same reason as Option 1. It also excludes Geo-thermal Energy, which is a clear example of a non-conventional energy resource.

Therefore, only Option 4 accurately lists the non-conventional energy resources from the given list: Solar Energy, Wind Energy, Geo-thermal Energy, and Tidal Energy.