ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

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 # 2

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

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

Question # 3

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 # 4

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 # 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

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 # 7

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.

Question # 8

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 # 9

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 # 10

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.

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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

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

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

State Ohm's law and write its formula.

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

Define Electromotive force and Terminal potential difference.

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

Differentiate between conventional and non-conventional current.

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

What is thermistor? Gives its two applications.

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?

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

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

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

State Ohm's law and write its formula.

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

Define Electromotive force and Terminal potential difference.

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

Differentiate between conventional and non-conventional current.

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

What is thermistor? Gives its two applications.

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?

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

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

Define Electromotive force and Terminal potential difference.

Write about any two sources of Current.

Differentiate between conventional and non-conventional current.

Does the bends in wire effect its electrical resistance?

Do two long and parallel current carrying wires attract each other?

State Ohm's law and write its formula.

What is meant by Tolerance? Also give one example.

What is meant by tolerance of resistors?

What is thermistor? Gives its two applications.

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

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

Do two long and parallel current carrying wires attract each other?

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 does the equation H=I2Rt show?

State Ohm's law and basic principle of electroplating.

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

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

What are non ohmic devices?Give two examples.

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

ICS Part 2 Physics Chapter 13 Short Questions Preparation

12th Class Physics
Short Questions Preparation

What does the equation H=I²Rt show?