SDC Activity

1)which impurities are added to form p-type semiconductor

• a)trivalent

• b)pentavalent

• c)both a&b

• d)none

2)what are the minority charge carriers in n-type semiconductor

• a)electrons

• b)holes

• c)both

• d)none

3) varactor diode is also known as

• a)tuning diode

• b)Varicap diode

• c)none

• d)both

4) Diffusion capacitance is present in___

• a) unbiased p-n diode

• b) Reverse biased Zener diode

• c) forward biased p-n diode

• d)reverse biased p-n diode

5)An electrical breakdown of a p-n junction occurs if

• a) forward voltage increase up to the rating

• b)reverse voltage increase beyond the rating

• c)forward voltage decrease below the rating

• d)reverse voltage decrease below the rating

6)when p-n junction is reverse biased,___

• a) depletion layer decreases

• b)offers low resistance

• c) depletion layer increases

• d)electron mobility increases

7)what is the formula for band width

• a)V=IR

• b)q=cv

• c)R/L

• V/f

8)LED converts from

• a)light energy to electrical energy

• b) mechanical energy to electrical energy

• c) chemical energy to mechanical energy

• d) electrical energy to light energy

9)zener diode is discovered in the year

• a)1934

• b)1947

• c)1888

• d)1940

10) Applications of LCD are

• a)it is used in mobile screen

• b)it is used in digital worst watch

• c)none

• d)both