When a pentavalent impurity is added to a pure semiconductor, it becomes

Addition of pentavalent impurity to a semiconductor creates many

A

Free electrons

B

Holes

C

Valence electrons

D

Bound electrons

The impurity level in an extrinsic semiconductor is about of pure semiconductor.

A

10 atoms for 108 atoms

B

1 atom for 108 atoms

C

1 atom for 104 atoms

D

1 atom for 100 atoms

A pentavalent impurity has ___________ Valence electrons

A

3

B

5

C

4

D

6

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -

A

5 : 8

B

10 : 9

C

8 : 5

D

9 : 10

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

A

Remains the same

B

Increases

C

Decreases

D

None of the above

Addition of trivalent impurity to a semiconductor creates many

A

Holes

B

Free electrons

C

Valence electrons

D

Bound electrons

A fraction becomes 6/5 when 5 is added to its numerator and becomes 1/2 when 4 is added to its denominator. What will be the value of the fraction?

A

8\/9

B

7\/10

C

7\/8

D

6\/11

If 1 is added to the numerator of a fraction, the fraction becomes 1. If 1 is added to the denominator, the fraction becomes 12Find the fraction.

A

13

B

12

C

23

D

34

নিম্নের কোনটি p-টাইপ অর্ধপরিবাহীতে n-টাইপ অর্ধপরিবাহীর তুলনায় বেশি আছে? (Which of the following does a p-type semiconductor have more compared to an n-type semiconductor-)

A

মোট ধনাত্মক আধান (total positive charge)

B

মোট আধান (total charge)

C

ইলেকট্রন ঘনত্ব (density of electrons)

D

হোল ঘনত্ব (density of holes)

If the iron ore contains clay as an impurity, the flux added during calcination, is

A

Clay

B

Lime stone

C

Argillaceous iron ore

D

All the above

When a pentavalent impurity is added to a pure semiconductor, it becomes

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