Question

X - Physics (A.P) Session - VII

2

II. Answer the following each question carry 1 mark 3 × 1 = 3M

7. Write the uses of fuse in house hold electric circuits.

8. In the figure the potential at A is _____ when the potential at B is zero.

2V

B

2A V=0

A

VA

5

9. On a bulb 60W , 120V is written. How much is its resistance ?

III. Answer the following each question carry 2 marks 3 × 2 = 6M

10. Why is the series arrangement not used for domestic circuits?

11. An electric fan rated 200W operates 8 hours/day. What is the cost of the energy to operate it for 30

days at Rs.3.00/- per kWh?

12. Show how you would connect three resistors, each of resistances 6 , so that the combination has a

resistance of (i) 9  ii) 4

IV. Answer the following each question carry 4 marks 2 × 4 = 8M

13. a) Three resistances R1

, R2

and R3

are connected to an electric cell of potential difference

V volts in parallel then

i) Plot the circuit describing the given arrangement?

ii) Write the values of current I1

, I2

, I3

flowing through the resistance R1

, R2

and R3

respectively

iii) Write the expression for total current (I) in the circuit

iv) Deduce expression for total resistance (R) for the combination

(OR)

b) Calculate the resultant resistance and total current in following circuit.

6V

A

B

C

D

E

10 10

10

14. a) Explain Kirchoff’s laws with examples.

(OR)

b)

3 6 9

V

A

36V

What are the readings of the ammeter and the voltmeter when key is closed?​

Answer 1

Answer:

7 in case of overloading it prevent from short circuit