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Electricity and Magnetism - SS1 Physics Past Questions and Answers - page 1

1

Kirchhoff's first law is also known as:

A

Law of Conservation of Energy

 

B

Ohm's Law

 

C

Junction Rule

 

D

Loop Rule

correct option: c
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2

Kirchhoff's second law is also known as:

A

Law of Conservation of Energy

 

B

Ohm's Law

 

C

Junction Rule

 

D

Loop Rule

correct option: d
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3

According to Kirchhoff's laws, the algebraic sum of currents at any junction in a circuit is:

A

Zero

 

B

Positive

 

C

Negative

 

D

Constant

correct option: a
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4

According to Kirchhoff's laws, the algebraic sum of potential differences in any closed loop of a circuit is:

A

Zero

 

B

Positive

 

 

C

Negative

 

D

Constant

correct option: a
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5

Kirchhoff's laws are based on the principle of:

A

Conservation of Charge

 

B

Conservation of Energy

 

C

Conservation of Momentum

 

D

Conservation of Mass

correct option: b
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6

Explain Kirchhoff's laws and their significance in analysing electric circuits.

Kirchhoff's laws are fundamental principles used in analysing electric circuits. 

 

Kirchhoff's current law (KCL) states that the algebraic sum of currents entering and leaving a node (or junction) in a circuit is zero. This law is based on the principle of conservation of charge, stating that the total current flowing into a node must be equal to the total current flowing out of it. KCL allows us to determine unknown currents in complex circuits and ensures the flow of current is consistent throughout the circuit.

Kirchhoff's voltage law (KVL) states that the algebraic sum of the potential differences (voltages) around any closed loop in a circuit is zero. This law is based on the principle of conservation of energy, stating that the total energy supplied by a source must be equal to the total energy consumed by the circuit components. KVL allows us to determine unknown voltages in complex circuits and ensures the conservation of energy within the circuit.

The significance of Kirchhoff's laws is that they provide a systematic and consistent method for analyzing and solving complex electrical circuits. By applying KCL and KVL, we can determine unknown currents and voltages, calculate power dissipation, and verify the overall electrical balance within a circuit. These laws form the foundation for circuit analysis and are essential in designing and troubleshooting electrical systems.

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7

What is the basic function of a capacitor in an electrical circuit?

A

To regulate the voltage

 

B

To store and release electrical energy

 

C

To convert AC to DC

 

D

To amplify the signal

correct option: b
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8

Capacitance is a measure of a capacitor's ability to store:

A

Voltage

 

B

Current

 

C

Power

 

D

Charge

correct option: d
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9

The SI unit of capacitance is:

A

Ohm

B

Ampere

 

C

Volt

 

D

Farad

correct option: d
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10

The capacitance of a capacitor depends on:

A

Its size and shape

 

B

The material used for the plates

 

C

The distance between the plates

 

D

All of the above

correct option: d
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