Which one of the following statements is not correct?
Sound waves in gases are longitudinal in nature
Sound waves having frequency below 20 Hz are known as ultrasonic waves
Sound waves having frequency below 20 Hz are known as ultrasonic waves
Sound waves with high audible frequencies are sharp
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