ChemistryQ51–52 of 82 questions
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51
ChemistryMCQAIPMT · 1991
The depletion layer in the $p-n$ junction is caused by
A
drift of holes
B
diffusion of charge carriers
C
migration of impurity ions
D
drift of electrons
Solution
(B) When a $p-n$ junction is formed,there is a higher concentration of holes in the $p$-region and a higher concentration of electrons in the $n$-region. Due to this concentration gradient,charge carriers (holes from $p$ to $n$ and electrons from $n$ to $p$) diffuse across the junction. As these carriers cross the junction,they recombine near the interface,leaving behind immobile ionized impurity atoms. This region,which is depleted of mobile charge carriers,is known as the depletion layer.
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52
ChemistryMCQAIPMT · 1991
Syngamy means:
A
Fusion of similar spores
B
Fusion of dissimilar spores
C
Fusion of cytoplasm
D
Fusion of gametes
Solution
(D) Syngamy is a biological process that involves the fusion of two haploid gametes to form a diploid zygote.
This process is a fundamental aspect of sexual reproduction in most organisms.
It is also known as fertilization.
Therefore,the correct option is $D$.
This process is a fundamental aspect of sexual reproduction in most organisms.
It is also known as fertilization.
Therefore,the correct option is $D$.
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