Class 11 Physics · Chapter 9 · Test 4
Kirchhoff's Rules and Bridges
41 MCQs This test covers Kirchhoff’s first and second rules with sign conventions and numericals, the Wheatstone bridge and its balance condition. It also covers the potentiometer and null method, the galvanometer, thermistors, light dependent resistors and the concrete bridge application.
41 questions · 35 min · 41 marks
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Sample questions
The first 5 of 41. Try each one, then tap to see the answer.
Question 1
Kirchhoff's first rule states that the algebraic sum of currents meeting at a junction is:
- AMaximum
- BEqual to the emf
- CInfinite
- DZero
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Answer: D
The sum of currents entering equals the sum leaving so the algebraic sum is zero.
Question 2
Kirchhoff's first rule is a consequence of the law of conservation of:
- AEnergy
- BCharge
- CMomentum
- DMass only
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Answer: B
No charge accumulates at a junction so charge is conserved.
Question 3
By convention a current flowing into a junction is taken as:
- ANegative
- BZero
- CPositive
- DImaginary
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Answer: C
Currents towards the point are positive and away are negative.
Question 4
At a junction I1 and I2 flow in while I3 and I4 flow out. Kirchhoff's first rule gives:
- AI1 + I2 = I3 + I4
- BI1 = I2 + I3 + I4
- CI1 + I3 = I2 + I4
- DI1 - I2 = I3 - I4
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Answer: A
Sum of currents in equals sum of currents out.
Question 5
Currents of 3 A and 2 A enter a junction and a current of 4 A leaves through one wire. The current in the remaining wire leaving the junction is:
- A9 A
- B5 A
- C2 A
- D1 A
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Answer: D
3 + 2 = 4 + I so I = 1 A.
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