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JEE 2020 Physics: Electric Instruments Quiz (28.06.2019)
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Question 1
In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2Ω. the balancing length becomes 120 cm. The internal resistance (in Ω) of the cell is
Question 2
In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R (in Ω) will be 
Question 3
Two voltameters one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are Z1 and Z2 respectively the charge which flows through the silver voltameter is
Question 4
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be
Question 5
An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is
Question 6
A galvanometer having a coil resistance of 
gives a full scale deflection, when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10 A, is
gives a full scale deflection, when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10 A, isQuestion 7
A potentiometer PQ is set up to compare two resistances as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key K3 is open. The balance point is at a length l1 cm from P when two way key K3 is plugged in between 2 and 1, while the balance point is at a length l2 cm from P when key K3 is plugged in between 3and 1. The ratio of two resistances
, is found to be:
, is found to be: Question 8
1f an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a:
Question 9
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance of 
a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.
a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell. Question 10
The daniel cell is balanced on 125 cm length of a potentiometer. Now, the cell is short circuited by a resistance of 2 Ω and tha balance is botained at 100 cm. the internal resistance of the daniel cell is
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Nov 6JEE & BITSAT
