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

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 # 3

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 # 4

Write about any two sources of Current.

Ans 1:
1. Electric generators convert mechanical energy into the electrical energy.
2. Solar cells convert sunlight directly into electrical energy.
3. Thermocouples convert heat energy into electrical energy.

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

What is meant by tolerance?

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

Question # 7

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 # 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

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 # 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

What are non ohmic devices?Give two examples.

Define Electromotive force and Terminal potential difference.

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

Write about any two sources of Current.

State Ohm's law and write its formula.

What is meant by tolerance?

What is ohmic and non ohmic devices with example.

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

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

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

What are non ohmic devices?Give two examples.

Define Electromotive force and Terminal potential difference.

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

Write about any two sources of Current.

State Ohm's law and write its formula.

What is meant by tolerance?

What is ohmic and non ohmic devices with example.

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

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

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 is meant by Tolerance? Also give one example.

What is the negative coefficient of temperature?

What does the equation H=I2Rt show?

What is wheat stone bridge?

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

Differentiate between conventional and non-conventional current.

What is meant by tolerance?

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

Name some effects of current.

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

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

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?

Differentiate between conventional and non-conventional current.

What is short circuit and open circuit mean to you?

Why potential meter is accurate measuring meter?

What is ohmic and non ohmic devices with example.

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

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

What is meant by tolerance?

What does the equation H=I2Rt show?

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

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?