Electronic circuit Quiz 1

Question 1

Riya was having a query over the large reverse current occurring in a zener diode. She was answered by her father who is a teacher in physics. What will be his explanation?

Accepted Answer

Due to the high electric field developed in the zener diode.

Answer

Due to the dynamic resistance of the zener diode.

Answer

Due to the high magnetic field developed in the zener diode.

Answer

All of these

Question 2

Medha was once observing a silicon bar which was having the number of free electrons in it as $$2	imes {{10}^{22}}$$ per cubic centimetre. After a lot more observations, she found that the number of holes in the same semiconductor is $$200	imes {{10}^{20}}$$. Identify the nature of the silicon bar she was observing?

Accepted Answer

Intrinsic semiconductor

Answer

n-type semiconductor

Answer

p-type semiconductor

Answer

Not a semiconductor

Question 3

Simi calculated that the electron current in an intrinsic semiconductor was $$2	ext{ }mA$$ and the hole current was found to be $$3.33	ext{ }mA$$. Using this data Rahul calculated the total current in the intrinsic semiconductor as $$5.6	ext{ }mA$$. What will be the percentage error in his calculation?

Accepted Answer

$$5.06\%$$

Answer

$$50.06\%$$

Answer

$$0.506\%$$

Answer

$$6\%$$

Question 4

Hima is having a diode in her hands while going to school. When reached her school, she entered her laboratory and connected this diode with a current source and observed the reading. At first, the voltage in the diode was $$0.3	ext{ }V$$ and the final voltage was $$0.7	ext{ }V$$. Similarly the initial current was $$0.1	ext{ }A$$ and the final current was $$1	ext{ }A$$. Calculate the dynamic resistance of the diode.

Accepted Answer

$$0.444	ext{ }\Omega $$

Answer

$$4.24	ext{ }\Omega $$

Answer

$$2.233	ext{ }\Omega $$

Answer

$$1	ext{ }\Omega $$

Question 5

The number of free electrons in an extrinsic semiconductor has been found to be $$5	imes {{10}^{14}}$$per cubic centimetre. And the number of holes in this material has been found to be $$3	imes {{10}^{2}}$$. What will be the intrinsic carrier concentration and the acceptor impurity concentration?

Accepted Answer

$$3.87	imes {{10}^{8}}$$, $$3	imes {{10}^{2}}$$

Answer

$$3.46	imes {{10}^{8}}$$,$$3.43	imes {{10}^{-7}}$$

Answer

$$1.5	imes {{10}^{17}}$$ , $$2.1	imes {{10}^{-7}}$$

Answer

None of these