Online Short Questions For Chapter 2 "ICS Part 2 Physics Chapter 13 Short Questions Preparation "
Try The Short Questions For ICS Part 2 Physics Chapter 13 Short Questions Preparation
Physics - ICS Part 2 Physics Chapter 13 Short Questions Preparation
Question # 1
What is ohmic and non ohmic devices with example.
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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 # 2
Define resistivity and electrolysis.
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Ans 1: The resistance of a meter cube of a material is called resistivity.Certain liquids such dilute sulphuric acid or copper sulphate solution conduct electricity due to some chemical reactions that take place within them.The study of this process is known as electrolysis.
Question # 3
Why potential meter is accurate measuring meter?
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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 # 4
Give two substance having negative temperature coefficient.Also define the temperature coefficient.
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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 # 5
Briefly describe the current through a metallic conductor and drift velocity.
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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 # 6
A voltmeter can not read the exact EMF of the cell.Why?
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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 # 7
Differentiate between conventional and non-conventional current.
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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.
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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
What is the conventional current? How does it differs from electric current?
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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 # 9
Define Electromotive force and Terminal potential difference.
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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.
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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 # 10
What are non ohmic devices?Give two examples.
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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.
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