Rectified spirit contains alcohol about:
(a) 80%
(b) 85%
(c) 90%
(d) 95%
X-ray is:
(a) Electromagnetic wave
(b) The flow of positive charge
(c) The flow of neutral practices
(d) The flow of electron
Geothermal energy can be obtained from the heating rocks by the
(a) Igneous rocks
(b) High temperature water
(c) decay of radioactive element
(d) All of these
The Earth’s rocks are in molten and partly molten state, usually within the Earth’s surface of
(a) 5 km
(b) 10 km
(c) 15 km
(d) 18 km