GK questions asked in Bihar 2014, with answers and explanations.
The source of the Sun's energy is
In the core of the Sun, at a temperature of about fifteen million kelvin, four hydrogen nuclei combine through the proton-proton chain to form one helium nucleus.
Read the full explanation →The oxidation number of Mn in KMnO4 is
Potassium permanganate is a neutral compound, so the oxidation numbers of all its atoms must add up to zero. Potassium, an alkali metal, is always +1, and each of the four oxygen atoms is -2, giving the oxygens a total of -8.
Read the full explanation →The equator divides the globe into
The equator is the latitude of 0 degrees and it runs east to west round the middle of the earth, cutting the globe into two equal halves.
Read the full explanation →Convert sound energy into electrical energy
A microphone is a transducer: sound waves strike a thin diaphragm, the diaphragm vibrates, and that mechanical vibration is turned into a varying electric signal.
Read the full explanation →Sun appears red at sunset because
At sunset the Sun is close to the horizon, so its light travels through a much thicker layer of atmosphere before it reaches the eye.
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