1. Which of the following gas is produced from incomplete burning of fuels such as petrol and diesel ?
The full-form of CNG is
The speed of light is about _________ km per second.
The first Indian satellite was
Rainbow formatiom is a natural phenomenon caused due to _________ of light.
The process of depositing a layer of any desired metal on another material by means of electricity is called
The range of audible frequency for human ear is .
In humans, the sound is produced by the