ICS Part 2 Physics Chapter 13 Short Questions Preparation

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

What is meant by tolerance of resistors?

Ans 1: Tolerance is the measure of possible variation from the marked value,A gold band has +-5% tolerance ,silver has +-10% and no band at all wounf mean a +-20 tolerance.

Question # 6

State Ohm's law and basic principle of electroplating.

Ans 1: Current passing through a wire is directly proportional to the potential difference applied across its ends provided that the physical state conductors remains same.
Basic principle of electroplating is a process of coating a thin layer of sum expensive metal of (gold,silver etc) on a article of some cheap metal.

Question # 7

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 # 8

Name any four source of current.

Ans 1: Source of current are
1. Cells
2. Electric generators
3. Thermocouples
4. Solar cells

Question # 9

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 # 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

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

Why potential meter is accurate measuring meter?

What is thermistor? Gives its two applications.

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

What is meant by tolerance of resistors?

State Ohm's law and basic principle of electroplating.

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?

Name any four source of current.

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

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

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

Why potential meter is accurate measuring meter?

What is thermistor? Gives its two applications.

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

What is meant by tolerance of resistors?

State Ohm's law and basic principle of electroplating.

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?

Name any four source of current.

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

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

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

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

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

What is meant by Tolerance? Also give one example.

What is ohmic and non ohmic devices with example.

What does the equation H=I2Rt show?

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

State Ohm's law and basic principle of electroplating.

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

Differentiate between conventional and non-conventional current.

Why potential meter is accurate measuring meter?

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

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

Define Electromotive force and Terminal potential difference.

What is the negative coefficient of temperature?

Differentiate between resistance and resistivity.Give their unit.

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

What are non ohmic devices?Give two examples.

State Ohm's law and write its formula.

Does the bends in wire effect its electrical resistance?

What is meant by tolerance?

What is meant by tolerance of resistors?

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?