In the p & n regions of the p-n junction the _________ & the ___________ are the minority charge carriers respectively.

In the p & n regions of the p-n junction the _________ & the ___________ are the majority charge carriers respectively.

A

holes, holes

B

electrons, electrons

C

holes, electrons

D

electrons, holes

For transistor action (a) Base, emitter, and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?

A

(d), (a)

B

(a), (b)

C

(b), (c)

D

(c), (d)

Which of the following statements(s) concerning natural regions of the world is/are correct? 1) Equatorial climatic regions have less urbanization 2) Mediterranean climatic regions have a high level of urbanization 3) Equatorial climatic regions have a high concentration of human population 4) Mediterranean climatic regions practice plantation farming Select the correct answer using the code given below:

A

1 and 2 only

B

1, 2 and 3

C

1, 2 and 4

D

1 only

The operation of JFET involves mainly: (a) Flow of Minority carriers (b) Flow of Majority carriers (c) A very high input impedance (d) Negative resistance Which of the following is correct?

A

(b) and (c)

B

(a) and (b)

C

(c) and (d)

D

(c) and (a)

The number of majority carriers that are available for recombining with excess minority carriers decreases as the excess semiconductor becomes intrinsic. Is it true?

A

True

B

False

Calculate the radioactive minority carrier lifetime in gallium arsenide when the minority carriers are electrons injected into a p-type semiconductor region which has a hole concentration of 1018cm-3. The recombination coefficient for gallium arsenide is 7.21*10-10cm3s-1.

A

2ns

B

1.39ns

C

1.56ns

D

2.12ms

Match Old name with the new name. Old Name New Name I. Allahabad Junction a) Pandit Deen Dayal Upadhyaya Junction II. Manduadih railway station b) Prayagraj Junction III. Mughalsarai junction c) Prayagraj Rambaug Railway station IV. Allahabad City railway station d) Banaras Railway Station Choose the correct code given below:

A

I - c, II- d, III- a, IV- b

B

I - b, II- c, III- a, IV- d

C

I - b, II- d, III- a, IV- c

D

I - c, II- b, III- a, IV- d

Assertion (A): A p-n junction diode with low junction depth can be used as a solar cell when illuminated by suitable light (wavelength) at the top thin layer above the junction. Reason (R): A p-n junction diode under no condition can be used as a solar cell. It can be used only as a light-emitting diode for optoelectronic applications.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true, but (R) is not the correct explanation of (A)

C

(A) is true, but (R) is false

D

(A) is false, but (R) is true

Sourab hires a car at junction A and drives 16 km towards north. He takes a right turn and drives 30 km to reach a bus stand. He now drives 10 km after taking a left turn to reach a petrol bunk. Finally, he takes a left turn and drives 30 km, and stops at Junction B. How far is junction A with respect to junction B?

A

24 km

B

26 km

C

28 km

D

22 km

A transistor is used in common emitter mode as an amplifier. Then a. The base-emitter junction is forward biased b. The base-emitter junction is reverse biased c. The input signal is connected in series with the voltage applied to the base-emitter junction d. The input signal is connected in series with the voltage applied to bias the base-collector junction Which of the following statement is true?

A

Only a

B

Both b and c

C

a, b and d

D

a and c

In the p & n regions of the p-n junction the _ & the ___ are the minority charge carriers respectively.

Related Questions