ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

What are non ohmic devices?Give two examples.

Ans 1: Those devices which don't obey the Ohm's law are called non-ohmic devices.Their current-voltage graphic is not a straight line.For example ,filament bulb and semiconductor diodes.

Question # 2

What is meant by tolerance?

Ans 1: Tolerance means the possible variation from the marked value.

Question # 3

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 # 4

What is thermistor? Gives its two applications.

Ans 1: Thermistors are heat sensitive resistors.Thermistors with positive temperature coefficient of resistance as well as negative temperature coefficient of resistance are available.They are used for accurate measuring of temperature up to 10K.They are used as temperature sensors.

Question # 5

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 # 6

Why potential meter is accurate measuring meter?

Ans 1: The voltage measured using potentiometer is the voltage across the terminal of the cell when current is not following through it.This voltage is exactly the emf of the cell.Further the accuracy of a potentiometer can be increased to a great extent by increasing the length of the "potentiometer wire".

Question # 7

Why does no current pass through Galvanometer in a balanced wheat stone bridge although the keys in the circuit are closed ?

Ans 1: No current pass through the galvanometer when wheat stone bridge is balanced.Because at this stage ,both the terminals of the galvanometer are at the same potential.Hence no current will flow through it.

Question # 8

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

Ans 1: In a metallic conductor,free electron are in random motion with the speed of several hundred km/s at the room temperature.If the ends of the wire are connected to the battery the free electrons are experience a force and directed to move in the electric field direction.The accelerating electrons keep on colliding with atoms of the conductors and transfer their energy to the lattice with the result that the electrons acquire an average velocity called drift velocity.The drift velocity is of the order of 10^-3.A steady current is establish in the wire.

Question # 9

Does the bends in wire effect its electrical resistance?

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

Question # 10

Differentiate between conventional and non-conventional current.

Ans 1: Conventional Current: The current flow die to positive charges from a point at higher potential to a point at lower potential is called conventional current.
Ans 2: Non-Conventional Current: The amount of electric charge that flow through a cross section of a conductor per unit time is known as electric current.It is also known as non-conventional current.

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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

What are non ohmic devices?Give two examples.

What is meant by tolerance?

Define Electromotive force and Terminal potential difference.

What is thermistor? Gives its two applications.

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

Why potential meter is accurate measuring meter?

Why does no current pass through Galvanometer in a balanced wheat stone bridge although the keys in the circuit are closed ?

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

Does the bends in wire effect its electrical resistance?

Differentiate between conventional and non-conventional current.

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

What are non ohmic devices?Give two examples.

What is meant by tolerance?

Define Electromotive force and Terminal potential difference.

What is thermistor? Gives its two applications.

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

Why potential meter is accurate measuring meter?

Why does no current pass through Galvanometer in a balanced wheat stone bridge although the keys in the circuit are closed ?

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

Does the bends in wire effect its electrical resistance?

Differentiate between conventional and non-conventional current.

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

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

What are the difficulties in testing weather the filament of lighted bulb obeys ohm's law?

What does the equation H=I2Rt show?

How can rheostat be used as potential divider?

How the heating effects produce when current flows through the conductor?

Name any four source of current.

What are non ohmic devices?Give two examples.

What is meant by tolerance of resistors?

What is ohmic and non ohmic devices with example.

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

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

Why does no current pass through Galvanometer in a balanced wheat stone bridge although the keys in the circuit are closed ?

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

What is meant by tolerance of resistors?

What are non ohmic devices?Give two examples.

Why potential meter is accurate measuring meter?

Name some effects of current.

What is meant by tolerance?

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

What are the difficulties in testing weather the filament of lighted bulb obeys ohm's law?

ICS Part 2 Physics Chapter 13 Short Questions Preparation

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12th Class Physics
Short Questions Preparation

What does the equation H=I²Rt show?