Final answer:
The incorrect statement is option d. Change in linear momentum in a given time is called impulse. Impulse is the product of force and time for which it acts, not the change in linear momentum.
Step-by-step explanation:
The incorrect statement is option d. Change in linear momentum in a given time is called impulse. Impulse is actually the product of force and time for which it acts, as stated in option a. Additionally, option b is correct as it states that change in linear momentum per unit time is called impulse. Finally, option c is also correct as it defines impulse as the change in momentum in a small interval of time.