ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

A voltmeter can not read the exact EMF of the cell.Why?

Ans 1: When a voltmeter is connected across a cell,it will draw some current from the cell and small potential drop takes place due current flowing through the internal resistance of the cell.As a result the actual emf of the cell decrease and the voltmeter cannot read exact value.

Question # 2

Why does the resistance of a conductor rise with a temperature?

Ans 1: As the temperature of the conductor rises,the amplitude of vibration of atoms increase and hence the probability of their collision with free electrons also increases which results in increase of resistance of conductor.

Question # 3

What is the effect on drift velocity of free electrons by increasing potential difference?

Ans 1: By an increase in potential difference,drift velocity also increase.Because by increasing potential difference ,the current also increase .

Question # 4

State Ohm's law and write its formula.

Ans 1: It states that "the current flowing through a conductor is directly proportional to the applied potential difference provided that the physical state remains same"
V=IR
Resistance: The opposition against the flow of current is known as resistance.The SI unit of resistance is Ohm
R=V/I

Question # 5

Define Electromotive force and Terminal potential difference.

Ans 1: Electromotive force:The energy supplied to a unit charge in moving it from negative to positive electrode inside the source is called electromotive force.
Ans 2: Terminal potential difference:The potential difference across the terminal of a cell or battery when current is being drawn from it is called terminal potential difference.The potential difference across the conductor is zero when no current flows through it.

Question # 6

What is the conventional current? How does it differs from electric current?

Ans 1: The current flow due to positive charges from a point at higher potential to a point at lower potential is called conventional current.It is due to positive charges while electric current is due to negative charges i.e electrons.

Question # 7

A potential difference is applied across the ends of a copper wire,What is the effect on the drift velocity of free electrons by decreasing the length and temperature of the wire?

Ans 1: By decreasing the length and temperature of wire the value of resistance in the wire also decrease which cause an increase in the value of current,Hence the drift velocity of free electrons also increase.

Question # 8

Does the bends in wire effect its electrical resistance?

Ans 1: No bend in wire do not affect its electrical resistance.

Question # 9

How a wheatstone bridge is used to determine an unknown resistance?

Ans 1: Wheatstone bridge is an especially designed electrically circuit used to calculate the accurate value of any unknown resistance.It consists of four resistance,a galvanometer, a battery and a switch connected.When the switch is closed current pas through the galvanometer and then the three known resistance R₁,R₂and R₃are adjusted in such a way that galvanometer show no deflection,In this balanced condition the fourth unknown resistance R₄can be calculated by using this relation.R₁/R₂=R₃/R₄.

Question # 10

What does the equation H=I²Rt show?

Ans 1: This equation show the heating effect,During their motion free electrons collide frequently with the atom of metal.on each collision they transfer some of their kinetic energy to the atom with which they collide.And these collisions produce heating effect in the wire.

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ICS Part 2 Physics Chapter 13 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

Online Short Questions For Chapter 2 "ICS Part 2 Physics Chapter 13 Short Questions Preparation "

Physics - ICS Part 2 Physics Chapter 13 Short Questions Preparation

A voltmeter can not read the exact EMF of the cell.Why?

Why does the resistance of a conductor rise with a temperature?

What is the effect on drift velocity of free electrons by increasing potential difference?

State Ohm's law and write its formula.

Define Electromotive force and Terminal potential difference.

What is the conventional current? How does it differs from electric current?

A potential difference is applied across the ends of a copper wire,What is the effect on the drift velocity of free electrons by decreasing the length and temperature of the wire?

Does the bends in wire effect its electrical resistance?

How a wheatstone bridge is used to determine an unknown resistance?

What does the equation H=I2Rt show?

Prepare Complete Set Wise Questions For Chapter 2 "ICS Part 2 Physics Chapter 13 Short Questions Preparation "

Set 1

Set 2

Set 3

ICS Part 2 Physics Chapter 13 Short Questions Preparation - Set 1

A voltmeter can not read the exact EMF of the cell.Why?

Why does the resistance of a conductor rise with a temperature?

What is the effect on drift velocity of free electrons by increasing potential difference?

State Ohm's law and write its formula.

Define Electromotive force and Terminal potential difference.

What is the conventional current? How does it differs from electric current?

A potential difference is applied across the ends of a copper wire,What is the effect on the drift velocity of free electrons by decreasing the length and temperature of the wire?

Does the bends in wire effect its electrical resistance?

How a wheatstone bridge is used to determine an unknown resistance?

What does the equation H=I2Rt show?

ICS Part 2 Physics Chapter 13 Short Questions Preparation - Set 2

Define Electromotive force and Terminal potential difference.

How a wheatstone bridge is used to determine an unknown resistance?

A potential difference is applied across the ends of a copper wire,What is the effect on the drift velocity of free electrons by decreasing the length and temperature of the wire?

What is meant by tolerance?

Does the bends in wire effect its electrical resistance?

State Ohm's law and write its formula.

What is the conventional current? How does it differs from electric current?

Briefly describe the current through a metallic conductor and drift velocity.

Give two substance having negative temperature coefficient.Also define the temperature coefficient.

What are non ohmic devices?Give two examples.

ICS Part 2 Physics Chapter 13 Short Questions Preparation - Set 3

Give two substance having negative temperature coefficient.Also define the temperature coefficient.

Differentiate between conventional and non-conventional current.

Write about any two sources of Current.

What is thermistor? Gives its two applications.

What is wheat stone bridge?

Name some effects of current.

What does the equation H=I2Rt show?

Why potential meter is accurate measuring meter?

What are non ohmic devices?Give two examples.

Define Electromotive force and Terminal potential difference.

ICS Part 2 Physics Chapter 13 Short Questions Preparation

12th Class Physics
Short Questions Preparation

What does the equation H=I²Rt show?

What does the equation H=I²Rt show?

What does the equation H=I²Rt show?