Tidal energy is harnessed by constructing a dam across? Mark as favorite Copy Link the river in plane areas the river in hilly trains narrow opening to the sea wide opening to the sea Check Answer
Unit of calorific value of a substance is? Mark as favorite Copy Link J kg J/kg Joules Kcal Check Answer
Which method is used to produce electricity in hydroelectric power plant.? Mark as favorite Copy Link By running dynamo by kinetic energy By ionizing water By boiling the water to produce steam Any of the above Check Answer
Radiations which are harmful to the living organisms are? Mark as favorite Copy Link ultraviolet radiations micro waves Visible radiation. Infrared radiation. Check Answer
A solar water heater cannot be used to get hot water on? Mark as favorite Copy Link a windy day a hot day a cloudy day a sunny day Check Answer
The major constituent of biogas is methane.? Mark as favorite Copy Link A is false but R is true. A is true but R is false. Both A and R are true but R is not the correct explanation of (a) Both A and R are true and R is the correct explanation of (a) Check Answer
Biogas is formed in the? Mark as favorite Copy Link absence of air only presence of water and absence of air presence of water only presence of air only Check Answer
U-235 will undergo fission by? Mark as favorite Copy Link low energy protons only medium energy neutrons high energy neutrons only low energy neutrons only Check Answer
Acid rain happens because? Mark as favorite Copy Link earth atmosphere contains acids electrical charges are produced due to friction amongst clouds burning of fossil fuels releases oxides of carbon, nitrogen and sulphur in the atmosphere Sun heats up the upper layer of the atmosphere Check Answer