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Current Electricity

Solve all questions.

Jan 18, 6:00 PM

60 minutes

Jan 18, 7:00 PM

50.0 marks

MCQ

50 questions

Er. prem chand azad

physics teacher of st. Mary's school masaurhi

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Question Text

Question 1 :
The maximum number of electrons in a subshell is given by the expression .......

Question 4 :
Name the particles which are responsible for the flow of current in a metal. 

Question 12 :
Which is the expression for resistivity of a wire of length $l$ and cross-section area A?

Question 16 :
If doubling the voltage across a resistor doubles the current through the resistor then

Question 19 :
In a metallic conductor, electric current is thought to be due to the movement of:

Question 20 :
What steady current can be drawn from an accumulator of capacity $80\ Ah$?

Question 23 :
In general, when the temperature of a conductor increases, its resistance

Question 29 :
The graph between potential difference and current for a conductor is a straight line passing through the origin. Which law is illustrated by such a graph?

Question 30 :
The electrons of the outermost orbit of an atom which have left their atoms and can freely move inside a solid, are called

Question 31 :
The substances which have a large number of free electrons and offer low resistance are known as

Question 32 :
When a potential difference is applied across the ends of a linear metallic conductor

Question 33 :
The quantity of charge flowing per unit time is called .....

Question 35 :
Identify the statement which best describe transfer of electrical energy through a conductor.

Question 36 :
The number of electrons in the outermost orbit of carbon atom is

Question 37 :
 Which of the following theories could not explain completely the behaviour of conductors, insulators, and semiconductors.

Question 42 :
What is the relation between resistance R and resistivity $\rho$ of a wire ?

Question 43 :
How much greater is one micro coulomb compared to an electronic charge?

Question 44 :
The potential difference across the ends of a resistor is _________ to the current through it.

Question 46 :
A steady current is passing through a linear conductor of non uniform cross-section.  The net quantity of charge crossing any cross section per second is

Question 48 :
Who named the negatively charged particles present in cathode rays as electrons ?

Question 49 :
Taking the resistivity of platinoid as $3.3 \times 10^{-7} \Omega m$, find the resistance of $7.0 m$ of platinoid wire of average diameter $0.14 cm$. 

Question 50 :
The relation between potential difference (V) and current (I) was discovered by :

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