Question papers

SAHYADRI PU COLLEGE, KOLAR

II PUC PHYSICS (33)

 UNIT TEST – SEPTEMBER 2016

TIME: 60 MIN                                                                                       MAX MARKS: 30

General instructions 

* All parts are compulsory

* Answer without relevant diagram/ figure/ circuit wherever necessary will not carry any            marks

* Direct answers to the Numerical problems without detailed solutions will not carry any            marks

PART - A

I.  Answer ALL the following questions.    3x1=3M

1.Define impedance in an ac circuit.

2.What is wattless current?

3.What is displacement current?

PART - B

II. Answer any THREE of the following questions.               3x2=6M

4.Define rms value and peak value of ac.

5.What is Q-factor? Mention its equation.

6.Explain the inconsistency of Ampere’s circuital law.

7.Mention any two properties of electromagnetic induction.

PART - C

III. Answer any TWO of the following questions.                2x3=6M

8.Show that current leads the voltage by 900 in an ac circuit containing pure capacitor..

9.Mention any three differences between Inductive reactance & Capacitive reactance.

10.Obtain an expression for displacement current.

PART - D

IV.  Answer any TWO of the following questions.    2x5=10M

11. Derive an expression for resultant voltage, current and impedance of LCR circuit.

12. a)  What is a transformer?

       b) Mention the types of transformer.

       c) Mention any three types of energy losses in a transformer.

13. What is electromagnetic spectrum? Mention any two uses of X-rays and IR-rays.

1. V.  Answer any ONE of the following questions.     1x5=5M

14. Calculate the resonant frequency in LCR circuit with inductance 2H, capacitance 32µF & resistance 10Ω. What is the Q-value of this circuit?

15. A 60V-10W lamp is to be run on 100V-60Hz ac mains. Calculate the inductance of the choke coil required to be connected in series with it to work the bulb.