Physics
The impurity atoms with which silicon should be doped to make p-type semiconductors are

Boron
Germanium
Antimony
Phosphorus

ANSWER DOWNLOAD EXAMIANS APP

Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
The gold piece will weigh more
Both silver and gold pieces weigh equal
The silver piece will weigh more

ANSWER DOWNLOAD EXAMIANS APP