JEE/ NEET | Physics | Current Electricity | Measuring Instruments | MCQ | Lecture 11

00:00 7. In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is
03:09 8. In a metre bridge experiment, resistances are connected as shown in figure. The balancing length 1, is 55 cm. Now an unknown resistance x is connected in series with P and the new balancing length is found to be 75 cm. The value of x is
06:41 9. Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is
09:42 10. Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged the balance point shifts by
12:22 11. A resistance R is to be measured using a meter bridge, student chooses the standard resistance S to be 1002. He finds the null point at 1₁ = 2.9cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?
20:00 12. An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the
other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R₁ is (in ohm)
22:16 13. A galvanometer can be converted into an ammeter by connecting
22:36 14. When a 122 resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
25:40 15. In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
28:45 16. An ammeter with internal resistance 900 reads 1.85 A when connected in a circuit containing a battery and two resistors 7000 and 4100 in series. Actual current will be
35:37 17. We have a galvanometer of resistance 252. It is shunted by a 2.52 wire. The part of total current that flows through the galvanometer is given as
37:37 18. The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times
39:30 19. If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess
40:24 20. The current flowing in a coil of resistance 90 2 is to be reduced by 90%. What value of resistance should be connected in parallel with it
42:52 21. In the circuit shown, the galvanometer G of resistance 602 is shunted by a resistance r = 0.022. The current through R is nearly 1 A. The value of resistance R is (in ohms) is nearly
46:08 22. A galvanometer, having a resistance of 50 Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97× 10^-2 cm² that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is
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