KARTHIK

1). Semiconductor acts as an insulator in the presence of impurities.

• true

• false

2). Which of the following is known as indirect band gap semiconductors?

• Germanium

• Nickel

• Platinum

• Carbon

3). identify the picture?

• screen

• lcd

• led

• display

4). A semiconductor is formed by ……… bonds.

5). A semiconductor has ………… temperature coefficient of resistance.

6). Identify the pin diode from the picture__________________

• 
• 
• 
• 

7). A semiconductor has generally ……………… valence electrons.

• 1

• 2

• 3

• 4

8). When a pure semiconductor is heated, its resistance …………..

• goes up

• goes down

• remains same

• cant say

9). Name the diode?

10). Addition of pentavalent impurity to a semiconductor creates many ……..

• Free electrons

• Holes

• Valence electrons

• Bound electrons