ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

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 # 2

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 # 3

Differentiate between resistance and resistivity.Give their unit.

Ans 1: Resistance: The opposition against the flow of current is known as resistance,The SI unit of resistance is Ohm.
R=V/I
Ans 2: Resistivity:The resistance of a meter cube of a material is called resistivity.Its unit is known as ohm-meter.

Question # 4

Define temperature coefficient of resistivity.

Ans 1: The temperature of coefficient of resistivity is defined as fractional change in resistivity per kelvin rise in temperature.Its unit is K^-1.

Question # 5

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 # 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

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

Ans 1: In case of light bulb,the temperature of the filament increase with the passage of current through it.Hence the Ohms law can't be applied to filament bulb.

Question # 9

Name some effects of current.

Ans 1: Some effects are :
1. Heating effects
2. Magnetic effect
3. Chemical effect

Question # 10

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

Ans 1: Yes ,If the direction of current is same in two long parallel current carrying wires.Because the opposite pole of electromagnet comes in front of each other and attracts.

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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 does the equation H=I2Rt show?

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

Differentiate between resistance and resistivity.Give their unit.

Define temperature coefficient of resistivity.

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?

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 ?

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

Name some effects of current.

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

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 does the equation H=I2Rt show?

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

Differentiate between resistance and resistivity.Give their unit.

Define temperature coefficient of resistivity.

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?

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 ?

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

Name some effects of current.

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

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?

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

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

Differentiate between conventional and non-conventional current.

Define temperature coefficient of resistivity.

Differentiate between resistance and resistivity.Give their unit.

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

What are non ohmic devices?Give two examples.

Define Electromotive force and Terminal potential difference.

What is meant by Tolerance? Also give one example.

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

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

What is meant by Tolerance? Also give one example.

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?

Differentiate between conventional and non-conventional current.

State Ohm's law and basic principle of electroplating.

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

Define Electromotive force and Terminal potential difference.

Name some effects of current.

What is meant by tolerance?

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?