Electrical Measurements

1. In meter bridge experiment, resistors of resistance 10ohm and 5ohm are connected in the left and right gap respectively , when the resistor of 2 ohm is shunted by wire , What is the shift of null point ?

• 20.9cm towards right
• 20.9cm towards left
• 40cm towards left
• 40 cm towards right

2. Find the emf of cell which balance against a length of 280cm of potentiometer wire , given potential difference per cm wire as 0.008

• 1.08 V
• 2.04 V
• 2.24 V
• 3.25 V

3. Using Kirchhoff laws, find the currents of the network

• I1 =48/31 , I2 =66/31, I3 =18/31
• I1 =18/31 , I2 =26/31, I3 =18/31
• I1 =22/13 , I2 = -6/13, I3 =28/13
• none of these

4. A potentiometer having wire 1000cm long stretched on it is connected to a battery having a steady voltage , A Daniel cell gives a null point at 400cm. if the length of potentiometer wire increased by 200cm find the new position of null point

• 360cm
• 400cm
• 440cm
• 480cm

5. A 4.0 V potentiometer used for the determination of internal resistance of a 2.5 V cell. The balance point of the cell in open circuit is 96.3 cm. When a resistor of 12.5 Ω is used in the external circuit of the cell, the balance point shifts to 76.8 cm length of the potentiometer wire. Determine the internal resistance of the cell.

• 3.125 ohm
• 2.125 ohm
• 1.125 ohm
• 0.125 ohm

6. Twelve identical wires of resistance 4 ohm , are joined to form a skeleton cube. The Current enters at one corner and leaves at the diagonally opposite corner find the total resistance between these corners

• 1.33ohm
• 2.33ohm
• 3.33ohm
• 4.33ohm