Which one of the following statements is not correct for light rays?
Light travels at different speeds in different media.
Light travels at almost 300 million metres per second in air.
Light speeds down as it leaves a water surface and enters the air.
Light speeds up as it leaves a glass surface and enters the air.
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy