Now my question is what is the use of 10 kilo-ohm resistor that is connected between the power and the input terminals? What happens is this particular resistor is removed? Please explain.
This Resistor controls the collector current passing in the transistor and affects the bais point . So according to the specific amplification (GAIN) the designer wanted has choosen this resistor to be 10k using the basic transistor equations.
for more details : The NPN Transistor