NEET Practice Questions (MCQs) with Answers & Solutions

The NCERT states, 'The electric field direction of the junction is such that if electrons on p-side or holes on n-side in their random motion come close to the junction, they will be swept to its majority zone. This drift of carriers gives rise to current. Thedrift current is of the order of a few μA.'

The context clearly states, 'The above discussion shows that the p-n junction diode primarily allows the flow of current only in one direction (forward bias).'

The NCERT states, 'The magnitude of this current is usually in mA.' (referring to forward current).

The NCERT explains, 'Due to the applied voltage, electrons from n-side cross the depletion region and reach p-side (where they are minority carries). Similarly, holes from p-side cross the junction and reach the n-side (where they are minority carries). This process under forward bias is known as minority carrier injection.'

The NCERT text states, 'The forward bias resistance is low as compared to the reverse bias resistance.' This is because 'in forward bias... the barrier is decreased' and 'in reverse bias... the barrier increases'.

The text states, 'However, for special cases, at very high reverse bias (break down voltage), the current suddenly increases.'

The context states: 'The process of childbirth is called parturition which is induced by a complex neuroendocrine mechanism involving cortisol, estrogens and oxytocin.' Progesterone levels typically drop before parturition, but it's not listed as directly inducing the process in this neuroendocrine mechanism.

The context states: 'The mammary glands of the female undergo differentiation during pregnancy and starts producing milk towards the end of pregnancy by the process called lactation.' Lactogenesis refers to the initiation of milk production.

The context mentions: 'The milk produced during the initial few days of lactation is called colostrum which contains several antibodies absolutely essential to develop resistance for the new-born babies.'

The text states: 'The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex.'