Physics · JEE

Kirchhoff's laws and their applications, Wheatstone bridge, Metre Bridge Mock Test for JEE

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Syllabus context

Part of Current Electricity in JEE Main Physics.

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Q1PhysicsUnit 12: Current Electricity

Between any two points in a circuit, the sum of all

\ldots \ldots . . . . . . .

is the same through any pathway.

Q2PhysicsUnit 12: Current Electricity

In the given circuit diagram the ratio of potential difference across 3 ohm and 4 ohm resistance is

\frac{3}{4} .

The unknown resistance

\boldsymbol{R}

is:-

Q3PhysicsUnit 12: Current Electricity

In the ladder network shown, current through the resistor

3 \Omega

0.25 A .

The input voltage '

V^{\prime}

is equal to

Q4PhysicsUnit 12: Current Electricity

During an experiment with a metre bridge, the galvanometer shows a null point when the jockey is pressed at

40.0 \mathrm{cm}

using a standard resistance of

90 \Omega,

as shown in the figure. The least count of the scale used in the metre bridge is 1 mm. The unknown resistance is

Q5PhysicsUnit 12: Current Electricity

Kirchhoff's law of meshes is in accordance with law of conservation of:

Q6PhysicsUnit 12: Current Electricity

Assertion Total current entering a circuit is equal to leaving the circuit by Kirchhoff's law. Reason It is based on conservation of energy.

Q7PhysicsUnit 12: Current Electricity

Assertion Kirchhoff's junction rule can be applied to a junction of several lines or a point in a line. Reason When steady current is flowing, there is no accumulation of charges at any junction or at any point in a line.

Q8PhysicsUnit 12: Current Electricity

A Wheatstone bridge consisting of four

\operatorname{arms}

of resistances

P, Q, R, S

is most sensitive when :

Q9PhysicsUnit 12: Current Electricity

Assertion (A) : In a metrebridge ; Copper wire is connected in the left gap and silicon is connected in the right gap. When the temperature of both wires increase, balancing point shifts to right. Reason (R) :Temperature coeficient of copper is (-)Ve and that of silicon is

(+)

Ve.

Q10PhysicsUnit 12: Current Electricity

The point in a Meter bridge is at

35.6 \mathrm{cm} .

If the resistances in the gaps are interchanged,the new balance point is:

Q11PhysicsUnit 12: Current Electricity

In the circuit shown the current through the

4 \Omega

resistor is 1 amp when the points

P

and

M

are connected to a d.c voltage source. The potential difference between the points

M

and

N

is:

Q12PhysicsUnit 12: Current Electricity

Assertion The wire of a potentiometer should be of uniform area of cross section. Reason It satisfies the requirement of the principle of the potentiometer.

Q13PhysicsUnit 12: Current Electricity

Four conductors of resistance 4,3,9 and 6 ohm are connected in

A B, B C, C D

and DA arms of a Wheatstone bridge. The bridge can be balanced by connecting.

Q14PhysicsUnit 12: Current Electricity

A resistance of

2 \Omega

is connected across one gap of a metrebridge ( the length of the wire is

100 \mathrm{cm}

) and an unknown resistance, greater than

2 \Omega,

is connected across the other gap. When these resistance's are interchanged, the balance point shifts by

20 \mathrm{cm}

Neglecting any corrections, the unknown resistance is:

Q15PhysicsUnit 12: Current Electricity

Which of the following statements is/are incorrect for a meter bridge, which is used to compare two resistances?

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