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

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 # 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

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 # 5

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 # 6

Does the bends in wire effect its electrical resistance?

Ans 1: No bend in wire do not affect its electrical resistance.

Question # 7

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 # 8

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 # 9

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 # 10

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.

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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?

Differentiate between resistance and resistivity.Give their unit.

State Ohm's law and write its formula.

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

Differentiate between conventional and non-conventional current.

Does the bends in wire effect its electrical resistance?

What are non ohmic devices?Give two examples.

What is thermistor? Gives its two applications.

What is meant by tolerance of resistors?

Write about any two sources of Current.

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?

Differentiate between resistance and resistivity.Give their unit.

State Ohm's law and write its formula.

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

Differentiate between conventional and non-conventional current.

Does the bends in wire effect its electrical resistance?

What are non ohmic devices?Give two examples.

What is thermistor? Gives its two applications.

What is meant by tolerance of resistors?

Write about any two sources of Current.

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

What does the equation H=I2Rt show?

Name some effects of current.

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

What is the negative coefficient of temperature?

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

Write about any two sources of Current.

What is meant by Tolerance? Also give one example.

Does the bends in wire effect its electrical resistance?

Name any four source of current.

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

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

What is wheat stone bridge?

Name some effects of current.

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

What are non ohmic devices?Give two examples.

Define temperature coefficient of resistivity.

What is meant by tolerance?

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

What is the negative coefficient of temperature?

What does the equation H=I2Rt show?

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?