ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

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 # 2

What is ohmic and non ohmic devices with example.

Ans 1: The devices which obey Ohm's law are called ohmic devices and devices which do not obey Ohm's law are called non-ohmic law.For example copper,silver and gold are ohmic whereas diodes and tungsten filaments are non ohmic.

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

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.

Question # 8

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

Ans 1: The temperature coefficient of a resistance is defined as fractional change in resistance per kelvin rise in temperature.Its unit is K^-1.Substance like Ge and Si have negative temperature coefficient.

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

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.

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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 is thermistor? Gives its two applications.

What is ohmic and non ohmic devices with example.

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?

State Ohm's law and write its formula.

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

What does the equation H=I2Rt show?

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

Does the bends in wire effect its electrical resistance?

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

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 is thermistor? Gives its two applications.

What is ohmic and non ohmic devices with example.

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?

State Ohm's law and write its formula.

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

What does the equation H=I2Rt show?

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

Does the bends in wire effect its electrical resistance?

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

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

What is wheat stone bridge?

What is thermistor? Gives its two applications.

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

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

What is meant by Tolerance? Also give one example.

Differentiate between conventional and non-conventional current.

What are non ohmic devices?Give two examples.

What is ohmic and non ohmic devices with example.

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

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

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

What is meant by tolerance of resistors?

State Ohm's law and basic principle of electroplating.

State Ohm's law and write its formula.

Differentiate between conventional and non-conventional current.

What are non ohmic devices?Give two examples.

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

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

Name any four source of current.

Define resistivity and electrolysis.

What is thermistor? Gives its two applications.

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?

What does the equation H=I²Rt show?