$1-15$ Which source should not be considered a main renewable energy source?

$($a$)$ Wind

$($b$)$ Hydro

$($c$)$ Tidal

$($d$)$ Biomass

$($e$)$ Geothermal

$1-16$ The fastest$-$growing renewable energy sources in the world are

$($a$)$ Wind and solar

$($b$)$ Hydro and biomass

$($c$)$ Solar and hydro

$($d$)$ Biomass and wave

$($e$)$ Geothermal and biomass

$1-17$ Which renewable energy sources are only used for electricity generation?

$($a$)$ Wind and solar

$($b$)$ Hydro and solar

$($c$)$ Solar and geothermal

$($d$)$ Wind and hydro

$($e$)$ Hydro and geothermal

$1-18$ Which renewable energy source should not be considered to be the manifestation of solar en$-$

ergy in different forms?

$($a$)$ Wind

$($b$)$ Hydro

$($c$)$ Wave

$($d$)$ Biomass

$($e$)$ Geothermal

$1-19$ Reducing energy use to the minimum level, but to do so without reducing the standard of

living, the production quality, and the profitability is called

$($a$)$ Energy renewability

$($b$)$ Energy efficiency

$($c$)$ Energy minimization

$($d$)$ Fuel savings

$($e$)$ Fuel conservation