NEET Physics Wheatstone Bridge and Different Measuring Instruments MCQs Set A

a) the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell

b) the p.d. of the wire between +ve point of cell and jockey becomes equal to the e.m.f. of the battery

c) the p.d. across the potentiometer wire becomes equal to the e.m.f. of the battery

d) the e.m.f. of the battery becomes equal to the e.m.f of the experimental cell

Answer: the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell

Question: Why is the Wheatstone bridge better than the other methods of measuring resistances?

a) It is a null method

b) It has four resistor arms

c) It is based on Kirchoff’s law

d) It does not involve Ohm’s law

Answer: It is a null method

Question: In the experiment of potentiometer, at balance point, there is no current in the

a) galvanometer circuit

b) potentiometer circuit

c) both main and galvanometer circuits

d) main circuit

Answer: galvanometer circuit

Question: Sensitivity of potentiometer can be increased by

a) increasing the length of the potentiometer

b) decreasing the length of the potentiometer wire

c) None of these

d) increasing the e.m.f of the cell

Answer: increasing the length of the potentiometer

Question:  For measuring voltage of any circuit, potentiometer is preferred to voltmeter because

a) the potentiometer almost draws no current during measurement.

b) range of the voltmeter is not as wide as that of the potentiometer

c) calibration in the voltmeter is sometimes wrong

d) the potentiometer is cheap and easy to handle

Answer:  the potentiometer almost draws no current during measurement.

Question:  In a wheatstone bridge in the battery and galvanometer are interchanged then the deflection in galvanometer will

a) not change

b) change in opposite direction

c) none of these

d) change in previous direction

Answer: not change

Question:  In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistance are interchanged. The error so removed is

a) end correction

b) index error

c) due to temperature effect

d) random error

Answer:  end correction

Question:  Match the entries of Column I with their correct mathematical expressions in Column II

a)

b)

c)

d)

Answer:

Question: Assertion : In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Reason : As resistance increase current more accurately then ammeter.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct.

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question: AB is a wire of potentiometer with the increase in value of resistance R, the shift in the balance point J will be

a) towards B

b) towards A

c) remains constant

d) first towards B then back towards A

Answer:  towards B

More Questions.............................................

Question:  In a Wheatstone bridge all the four arms have equal resistance R. If the resistance of galvanometer arm is also R, the equivalent resistance of combination is

a) R

b) R/2

c) R/4

d) 2R

Answer:  R

Question:

a) 0.2 A

b) 0.1 A

c) 2. 0 A

d) 1. 0 A

Answer:  0.2 A

Question:

a)

b)

c)

d)

Answer:

Question:   The current I drawn from the 5 volt source will be

a) 0.5 A

b) 0.33 A

c) 0.67 A

d) 0.17 A

Answer:  0.5 A

Question: Assertion : The e.m.f of the driver cell in the potentiometer experiment should be greater that the e.m.f of the cell to be determined.
Reason : The fall of potential across the potentiometer wire should not be less than the e.m.f of the cell to be determined.

a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

c) Assertion is correct, reason is incorrect

d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question:  In the figure in balanced condition of wheatstone bridge

a) B and D are at same potential

b) Any of the two B or D can be at higher potential than other arbitrarily

c) D is at higher potential

d) B is at higher potential

Answer:  B and D are at same potential

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  Each of the resistance in the network shown in fig. is equal to R. The resistance between the terminals A and B is

a) R

b) 5 R

c) 3 R

d) 6 R

Answer:  R

Question:

a)

b)

c)

d)

Answer:

Question:

a) to the right of D

b) to the left of D

c) at the same point D

d) to the left of D if S' has lesser value than S and to the right of D if S' has more value than S

Answer: to the right of D

Question:  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 will be

a)

b)

c)

d)

Answer:

Question:   In a metre bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is

a)

b)

c)

d)

Answer:

Question: If specific resistance of a potentiometer wire is 10^–7Wm current flowing through it, is 0.1 amp and cross sectional area of wire is 10^–6 m², then potential gradient will be

a) 10^–2 volt/m

b) 10^–6 volt/m

c) 10^–4 volt/m

d) 10^–8 volt/m

Answer:  10^–2 volt/m

Question:

a) 25 mV/meter

b) 25 V/meter

c) 2.5 mV/meter

d) 10 V/meter

Answer:  25 mV/meter

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:   An electric bulb is rated 220 volt - 100 watt. The power consumed by it when operated on 110 volt will be

a) 25 watt

b) 50 watt

c) 40 watt

d) 75 watt

Answer: 25 watt

Question:  A current of 2 A, passing through a conductor produces 80 J of heat in 10 seconds. The resistance of the conductor in ohm is

a) 2

b) 4

c) 20

d) 0.5

Answer:  2