Question 1 :
In ballistic galvanometer, the frame on which the coil is wound is non-metallic to:

Question 2 :
Kirchhoff's law of junction, $\displaystyle \sum { I } =0$, is based on

Question 3 :
Three resistances P, Q, R each of $2\Omega $ and an<br>unknown resistance S form the four arms of a<br>Wheatstone bridge circuit. When a resistance of<br>$6\Omega $ is connected in parallel to S the bridge gets<br>balanced. What is the value of S ?<br><br><br><br>

Question 4 :
A lamp of 6 V and 30 W is used in a laboratory but the supply is of 120 V. what will be done to make use of the lamp?<br>(1) A resistance may be used<br>(2) A resistance may be used in series with lamp.<br>(3) The resistance should be of 18 $\Omega$.

Question 5 :
In a meter bridge, a standard resistor of R ohm is connected in the left gap and two wires A and B are connected one after the other in the right gap. The balancing length measured from the left is 50 cm for either of them. If the two wires are connected is series and put in the right gap, the balancing length measured from the left would be (in cm)<br/>

Question 7 :
A parallel combination of two resistors, of 1 $\Omega$ each, is connected in series with a $1.5 \Omega$ resistor. The total combination is connected across a $10\ V$ battery. The current flowing in the circuit is

Question 8 :
A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged the resistance to be put in series with the galvanometer is

Question 9 :
A rectangular coil 3x3 cm consisting of 100 turns caries 0.1 A. If it produces a deflection $10^{0}$, in a field of induction 0.1T, the couple per unit twist is<br/><br/>

Question 10 :
A galvanometer coil has a resistance of $50 \Omega$ and the meter shows full scale deflection for a current of $5 mA$. This galvanometer is converted into voltmeter of range $0 - 20 V$ by connecting

Question 12 :
The Kirchhoff's first law $(\displaystyle\sum i=0)$ and second law $\left(\displaystyle \sum iR=\displaystyle\sum E\right)$, where the symbols have their usual meanings, are respectively based on

Question 13 :
In a Wheatstone's bridge, three resistances P,Q and R are connected in three arms and the fourth arm is formed by two resistances $S_{1}$ and $S_{2}$ connected in parallel. The condition for the bridge to be balanced will be :<br/>