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CBSE Class 12 Physics Practical Data

By on Dec 5, 2007 in On A Whim |

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Students in CBSE schools across the country must be getting worried about completing their practical files, especially ones like me who tend to forget the way to the physics lab because I never go there (mostly). So just putting up the data her for two experiments that were among the last done in our school (and ones which quite a few people missed). Oh, and BTW, I didn’t know we had to the stacks & queues assignment stuff at school, so those who’ve been waiting for that to come up in my C++ Code Archive, please stand by until next week, when my physics and chemistry practicals will get over.

Forward-Bias p-n Junction Experiment

S. No.

Forward Bias Voltage (Vf) (V)

Forward Current (If) (mA)

1

0.10

0.04

2

0.20

0.10

3

0.30

0.16

4

0.40

0.26

5

0.46

21

6

0.48

24

7

0.50

35

8

0.52

46

Least count of voltmeter = 0.01 V
Zero error of voltmeter = 0 V
Least count of milliammeter = 0.2 mA
Range of milliammeter = 100 mA

Static Resistance:
Vf = 0.52 V
If = 0.046 A
R = 11.3 ohm

Dynamic Resistance:
(delta) Vf = 0.02 V
(delta) If = 0.011 A
r = 1.8 ohm

Zener Diode Reverse Breakdown Voltage Experiment
Zener diode used – IN758A
Specification, if available – No
Least count of voltmeter = 0.2 V
Zero error of voltmeter = 0 V
Least count of milliammeter (A1) = 0.2 mA
Least count of of milliammeter (A2) = 1 mA

S. No.

Voltmeter Reading (V)

Ammeter Reading (mA)

1

1

0

2

2

0.5

3

3

0.5

4

4

0.5

5

4.8

2

6

5

7.5

7

5

10

8

5

15

Zener (breakdown) voltage = 5 V

Errata: Some data in p-n junction experiment was given wrong, that has been corrected now.